Updated on 2025/06/06

写真a

 
Tak Kunihiro
 
Organization
Scheduled update Associate Professor
Position
Associate Professor
External link

Degree

  • Doctor of Science ( 2001.3   Tokyo Institute of Technology )

 

Papers

  • Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material

    Ryoji Tanaka, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    The Astrophysical Journal   965 ( 1 )   52 - 52   2024.4

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    Publishing type：Research paper (scientific journal)   Publisher：American Astronomical Society  

    Abstract

    The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge of the evolution of early solar system materials. However, no consensus has been obtained on the chronological data, which is important for understanding the evolution of the asteroid Ryugu. Here, the aqueous alteration age of Ryugu particles was determined by the Mn–Cr method using bulk samples, yielding an age of 4.13 + 0.62/−0.55 Myr after the formation of Ca–Al-rich inclusions (CAI). The age corresponds to 4563.17 + 0.60/−0.67 Myr ago. The higher 55Mn/52Cr, ε 54Cr, and initial ε 53Cr values of the Ryugu samples relative to any carbonaceous chondrite samples implies that its progenitor body formed from the least thermally processed precursors in the outermost region of the protoplanetary disk. Despite accreting at different distances from the Sun, the hydrous asteroids (Ryugu and the parent bodies of CI, CM, CR, and ungrouped C2 meteorites) underwent aqueous alteration during a period of limited duration (3.8 ± 1.8 Myr after CAI). These ages are identical to the crystallization age of the carbonaceous achondirtes NWA 6704/6693 within the error. The ε 54Cr and initial ε 53Cr values of Ryugu and NWA 6704/6693 are also identical, while they show distinct Δ'17O values. This suggests that the precursors that formed the progenitor bodies of Ryugu and NWA 6703/6693 were formed in close proximity and experienced a similar degree of thermal processing in the protosolar nebula. However, the progenitor body of Ryugu was formed by a higher ice/dust ratio, than NWA6703/6693, in the outer region of the protoplanetary disk.

    DOI： 10.3847/1538-4357/ad276a

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    Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/ad276a/pdf

  • The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu Reviewed

    Tsutomu Ota, Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Hiroshi Kitagawa, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka, Eizo Nakamura

    Universe   2023.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/universe9060293

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  • Organic Matter in the Asteroid Ryugu: What We Know So Far Invited Reviewed

    Christian Potiszil, Masahiro Yamanaka, Chie Sakaguchi, Tsutomu Ota, Hiroshi Kitagawa, Tak Kunihiro, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    Life   2023.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/life13071448

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  • Spectroscopic and Biophysical Methods to Determine Differential Salt‐Uptake by Primitive Membraneless Polyester Microdroplets

    Chen Chen, Ruiqin Yi, Motoko Igisu, Chie Sakaguchi, Rehana Afrin, Christian Potiszil, Tak Kunihiro, Katsura Kobayashi, Eizo Nakamura, Yuichiro Ueno, André Antunes, Anna Wang, Kuhan Chandru, Jihua Hao, Tony Z. Jia

    Small Methods   2023.5

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    Abstract

    α‐Hydroxy acids are prebiotic monomers that undergo dehydration synthesis to form polyester gels, which assemble into membraneless microdroplets upon aqueous rehydration. These microdroplets are proposed as protocells that can segregate and compartmentalize primitive molecules/reactions. Different primitive aqueous environments with a variety of salts could have hosted chemistries that formed polyester microdroplets. These salts could be essential cofactors of compartmentalized prebiotic reactions or even directly affect protocell structure. However, fully understanding polyester–salt interactions remains elusive, partially due to technical challenges of quantitative measurements in condensed phases. Here, spectroscopic and biophysical methods are applied to analyze salt uptake by polyester microdroplets. Inductively coupled plasma mass spectrometry is applied to measure the cation concentration within polyester microdroplets after addition of chloride salts. Combined with methods to determine the effects of salt uptake on droplet turbidity, size, surface potential and internal water distribution, it was observed that polyester microdroplets can selectively partition salt cations, leading to differential microdroplet coalescence due to ionic screening effects reducing electrostatic repulsion forces between microdroplets. Through applying existing techniques to novel analyses related to primitive compartment chemistry and biophysics, this study suggests that even minor differences in analyte uptake can lead to significant protocellular structural change.

    DOI： 10.1002/smtd.202300119

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  • An investigation of the internal morphology of asbestos ferruginous bodies: constraining their role in the onset of malignant mesothelioma

    Maya-Liliana Avramescu, Christian Potiszil, Tak Kunihiro, Kazunori Okabe, Eizo Nakamura

    Particle and Fibre Toxicology   20 ( 1 )   2023.5

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Background

    Asbestos is a fibrous mineral that was widely used in the past. However, asbestos inhalation is associated with an aggressive type of cancer known as malignant mesothelioma (MM). After inhalation, an iron-rich coat forms around the asbestos fibres, together the coat and fibre are termed an “asbestos ferruginous body” (AFB). AFBs are the main features associated with asbestos-induced MM. Whilst several studies have investigated the external morphology of AFBs, none have characterised the internal morphology. Here, cross-sections of multiple AFBs from two smokers and two non-smokers are compared to investigate the effects of smoking on the onset and growth of AFBs. Morphological and chemical observations of AFBs were undertaken by transmission electron microscopy, energy dispersive x-ray spectroscopy and selected area diffraction.

    Results

    The AFBs of all patients were composed of concentric layers of 2-line or 6-line ferrihydrite, with small spherical features being observed on the outside of the AFBs and within the cross-sections. The spherical components are of a similar size to Fe-rich inclusions found within macrophages from mice injected with asbestos fibres in a previous study. As such, the spherical components composing the AFBs may result from the deposition of Fe-rich inclusions during frustrated phagocytosis. The AFBs were also variable in terms of their Fe, P and Ca abundances, with some layers recording higher Fe concentrations (dense layers), whilst others lower Fe concentrations (porous layers). Furthermore, smokers were found to have smaller and overall denser AFBs than non-smokers.

    Conclusions

    The AFBs of smokers and non-smokers show differences in their morphology, indicating they grew in lung environments that experienced disparate conditions. Both the asbestos fibres of smokers and non-smokers were likely subjected to frustrated phagocytosis and accreted mucopolysaccharides, resulting in Fe accumulation and AFB formation. However, smokers’ AFBs experienced a more uniform Fe-supply within the lung environment compared to non-smokers, likely due to Fe complexation from cigarette smoke, yielding denser, smaller and more Fe-rich AFBs. Moreover, the lack of any non-ferrihydrite Fe phases in the AFBs may indicate that the ferritin shell was intact, and that ROS may not be the main driver for the onset of MM.

    DOI： 10.1186/s12989-023-00522-0

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    Other Link： https://link.springer.com/article/10.1186/s12989-023-00522-0/fulltext.html

  • Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu

    Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    Nature Communications   14 ( 1 )   2023.3

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    All life on Earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of life on Earth. While many meteoritic amino acids are considered indigenous, deciphering the extent of terrestrial contamination remains an issue. The Ryugu asteroid fragments (JAXA Hayabusa2 mission), represent the most uncontaminated primitive extraterrestrial material available. Here, the concentrations of amino acids from two particles from different touchdown sites (TD1 and TD2) are reported. The concentrations show that N,N-dimethylglycine (DMG) is the most abundant amino acid in the TD1 particle, but below detection limit in the other. The TD1 particle mineral components indicate it experienced more aqueous alteration. Furthermore, the relationships between the amino acids and the geochemistry suggest that DMG formed on the Ryugu progenitor body during aqueous alteration. The findings highlight the importance of aqueous chemistry for defining the ultimate concentrations of amino acids in primitive extraterrestrial samples.

    DOI： 10.1038/s41467-023-37107-6

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    Other Link： https://www.nature.com/articles/s41467-023-37107-6

  • Nitrogen Incorporation in Potassic and Micro- and Meso-Porous Minerals: Potential Biogeochemical Records and Targets for Mars Sampling

    Matthew P. Nikitczuk, Gray E. Bebout, Charles A. Geiger, Tsutomu Ota, Takuya Kunihiro, John F. Mustard, Sæmundur A. Halldórsson, Eizo Nakamura

    Astrobiology   2022.9

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    Publishing type：Research paper (scientific journal)   Publisher：Mary Ann Liebert Inc  

    DOI： 10.1089/ast.2021.0158

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    Other Link： https://www.liebertpub.com/doi/pdf/10.1089/ast.2021.0158

  • On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

    Eizo NAKAMURA, Katsura KOBAYASHI, Ryoji TANAKA, Tak KUNIHIRO, Hiroshi KITAGAWA, Christian POTISZIL, Tsutomu OTA, Chie SAKAGUCHI, Masahiro YAMANAKA, Dilan M. RATNAYAKE, Havishk TRIPATHI, Rahul KUMAR, Maya-Liliana AVRAMESCU, Hidehisa TSUCHIDA, Yusuke YACHI, Hitoshi MIURA, Masanao ABE, Ryota FUKAI, Shizuho FURUYA, Kentaro HATAKEDA, Tasuku HAYASHI, Yuya HITOMI, Kazuya KUMAGAI, Akiko MIYAZAKI, Aiko NAKATO, Masahiro NISHIMURA, Tatsuaki OKADA, Hiromichi SOEJIMA, Seiji SUGITA, Ayako SUZUKI, Tomohiro USUI, Toru YADA, Daiki YAMAMOTO, Kasumi YOGATA, Miwa YOSHITAKE, Masahiko ARAKAWA, Atsushi FUJII, Masahiko HAYAKAWA, Naoyuki HIRATA, Naru HIRATA, Rie HONDA, Chikatoshi HONDA, Satoshi HOSODA, Yu-ichi IIJIMA, Hitoshi IKEDA, Masateru ISHIGURO, Yoshiaki ISHIHARA, Takahiro IWATA, Kosuke KAWAHARA, Shota KIKUCHI, Kohei KITAZATO, Koji MATSUMOTO, Moe MATSUOKA, Tatsuhiro MICHIKAMI, Yuya MIMASU, Akira MIURA, Tomokatsu MOROTA, Satoru NAKAZAWA, Noriyuki NAMIKI, Hirotomo NODA, Rina NOGUCHI, Naoko OGAWA, Kazunori OGAWA, Chisato OKAMOTO, Go ONO, Masanobu OZAKI, Takanao SAIKI, Naoya SAKATANI, Hirotaka SAWADA, Hiroki SENSHU, Yuri SHIMAKI, Kei SHIRAI, Yuto TAKEI, Hiroshi TAKEUCHI, Satoshi TANAKA, Eri TATSUMI, Fuyuto TERUI, Ryudo TSUKIZAKI, Koji WADA, Manabu YAMADA, Tetsuya YAMADA, Yukio YAMAMOTO, Hajime YANO, Yasuhiro YOKOTA, Keisuke YOSHIHARA, Makoto YOSHIKAWA, Kent YOSHIKAWA, Masaki FUJIMOTO, Sei-ichiro WATANABE, Yuichi TSUDA

    Proceedings of the Japan Academy, Series B   98 ( 6 )   227 - 282   2022.6

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Academy  

    DOI： 10.2183/pjab.98.015

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  • Lithium in garnet as a tracer of subduction zone metamorphic reactions: The record in ultrahigh-pressure metapelites at Lago di Cignana, Italy

    Gray E. Bebout, Tsutomu Ota, Takuya Kunihiro, William D. Carlson, Eizo Nakamura

    Geosphere   18 ( 3 )   1020 - 1029   2022.6

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    Publishing type：Research paper (scientific journal)   Publisher：Geological Society of America  

    Abstract

    Lithium is of great interest as a tracer of metamorphic reactions and related fluid-mineral interactions because of its potential to isotopically fractionate during inter- and intracrystalline diffusional processes. Study of its transfer through subduction zones, based on study of arc volcanic and metamorphic rocks, can yield insight regarding ocean-to-mantle chemical cycling.

    We investigated major- and trace-element concentrations and δ7Li in garnet in ultrahigh-pressure (UHP) Lago di Cignana metasedimentary rocks, relating these observations to reconstructed prograde devolatilization history. In all garnet crystals we studied, heavy rare earth elements (HREEs), Y, and Li showed strong zoning, with elevated concentrations in cores (15–50 ppm Li) and marked high-concentration anomalies (up to 117 ppm Li, 5500 ppm Y; little or no major-element shift) as growth annuli, in which some crystals showed subtle elevation in δ7Li greater than analytical error of ~3% (2σ). Rutile inclusions appeared abruptly at annuli and outward toward rims, accompanied by inclusions of a highly zoned, Ca- and rare earth element–rich phase and decreased Nb concentrations in garnet. These relationships are interpreted to reflect prograde garnet-forming reaction(s), in part involving titanite breakdown to stabilize rutile, which resulted in delivery of more abundant Y and HREEs at surfaces of growing garnet crystals to produce annuli. Co-enrichments in Li and Y + REEs are attributed to mutual incorporation via charge-coupled substitutions; thus, increased Li uptake was a passive consequence of elevated concentrations of Y + REEs. The small-scale fluctuations in δ7Li (overall range of ~9%) observed in some crystals may correlate with abrupt shifts in major- and trace-element concentrations, suggesting that changes in reactant phases exerted some control on the evolution of δ7Li. For one garnet crystal, late-stage growth following partial resorption produced deviation in major- and trace-element compositions, including Li concentration, accompanied by a 10%–15% negative shift in δ7Li, perhaps reflecting a change in the mechanism of incorporation or source of Li.

    These results highlight the value of measuring the major- and trace-element and isotope compositions of garnets in high-pressure and UHP metamorphic rocks in which matrix mineral assemblages are extensively overprinted by recrystallization during exhumation histories. Lithium concentrations and isotope compositions of the garnets can add valuable information regarding prograde (and retrograde) reaction history, kinetics of porphyroblast growth, intracrystalline diffusion, and fluid-rock interactions. This work, integrated with previous study of devolatilization in the Schistes Lustrés/Cignana metasedimentary suite, indicates retention of a large fraction of the initially subducted sedimentary Li budget to depths approaching those beneath volcanic fronts, despite the redistribution of this Li among mineral phases during complex mineral reaction histories.

    DOI： 10.1130/ges02473.1

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  • Magmatic-hydrothermal processes of the Laojunshan metamorphic massif in Southeastern Asia: Evidence from chemical and B-isotopic variations of deformed tourmalines

    Wei Li, Shuyun Cao, Eizo Nakamura, Tsutomu Ota, Zhong Liu, Yanlong Dong, Tak Kunihiro

    Lithos   412-413   106609 - 106609   2022.3

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.lithos.2022.106609

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  • The Asteroid 162173 Ryugu: a Cometary Origin

    Hitoshi Miura, Eizo Nakamura, Tak Kunihiro

    The Astrophysical Journal Letters   925 ( 2 )   L15 - L15   2022.2

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    Publishing type：Research paper (scientific journal)   Publisher：American Astronomical Society  

    Abstract

    The Japanese Hayabusa2 mission has revealed in detail the physical characteristics of the C-type asteroid 162173 Ryugu, in particular, its spinning top-shaped rubble-pile structure and potentially high organic content. A widely accepted formation scenario for Ryugu is catastrophic collision between larger asteroids and the subsequent slow gravitational accumulation of collisional debris. An alternative scenario is that Ryugu is an extinct comet that lost its icy components. Here, we numerically simulated the sublimation of water ice from a porous cometary nucleus until the refractory components, such as silicate rocks and organic matter, were left behind as evaporative residues. Such a process represents the transformation from a comet to an asteroid. The spin-up related to the shrinking nucleus, associated with water ice sublimation, was also calculated. The result of the calculation indicates that the cometary origin scenario can account for all the features of Ryugu discussed above. We conclude that organic-rich spinning top-shaped rubble-pile asteroids, such as Ryugu, are comet–asteroid transition objects or extinct comets.

    DOI： 10.3847/2041-8213/ac4bd5

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    Other Link： https://iopscience.iop.org/article/10.3847/2041-8213/ac4bd5/pdf

  • Nitrogenous Altered Volcanic Glasses as Targets for Mars Sample Return: Examples From Antarctica and Iceland

    M. P. Nikitczuk, G. E. Bebout, T. Ota, T. Kunihiro, J. F. Mustard, R. L. Flemming, R. Tanaka, S. A. Halldórsson, E. Nakamura

    Journal of Geophysical Research: Planets   127 ( 2 )   2022.2

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    Publishing type：Research paper (scientific journal)   Publisher：American Geophysical Union (AGU)  

    DOI： 10.1029/2021je007052

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JE007052

  • The trace element composition of chondrule constituents: Implications for sample return methodologies and the chondrule silicate reservoir

    Tak Kunihiro, Tsutomu Ota, Masahiro Yamanaka, Christian Potiszil, Eizo Nakamura

    METEORITICS & PLANETARY SCIENCE   2021.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1111/maps.13665

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  • The Albedo of Ryugu: Evidence for a High Organic Abundance, as Inferred from the Hayabusa2 Touchdown Maneuver

    Christian Potiszil, Ryoji Tanaka, Katsura Kobayashi, Tak Kunihiro, Eizo Nakamura

    ASTROBIOLOGY   20 ( 7 )   916 - 921   2020.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1089/ast.2019.2198

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  • Concentration of meteoritic free organic matter by fluid transport and adsorption

    C. Potiszil, R. Tanaka, T. Ota, T. Kunihiro, K. Kobayashi, E. Nakamura

    Geochemical Perspectives Letters   13   30 - 35   2020.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.7185/geochemlet.2010

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  • Lithium- and oxygen-isotope compositions of chondrule constituents in the Allende meteorite

    Tak Kunihiro, Tsutomu Ota, Eizo Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   252   107 - 125   2019.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2019.02.038

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  • Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite

    Eizo Nakamura, Tak Kunihiro, Tsutomu Ota, Chie Sakaguchi, Ryoji Tanaka, Hiroshi Kitagawa, Katsura Kobayashi, Masahiro Yamanaka, Yuri Shimaki, Gray E. Bebout, Hitoshi Miura, Tetsuo Yamamoto, Vladimir Malkovets, Victor Grokhovsky, Olga Koroleva, Konstantin Litasov

    PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES   95 ( 4 )   165 - 177   2019.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2183/pjab.95.013

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  • Determination of Abundances of Fifty-Two Elements in Natural Waters by ICP-MS with Freeze-Drying Pre-concentration

    Que D. Hoang, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka, Hiroshi Kitagawa, Eizo Nakamura

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   43 ( 1 )   147 - 161   2019.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1111/ggr.12245

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  • Oxygen isotopes of chondritic components

    Hisayoshi Yurimoto, Alexander N. Krot, Byeon Gak Choi, Jerome Aleon, Takuya Kunihiro, Adrian J. Brearley

    Oxygen in the Solar System   68   141 - 186   2018.11

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  • Software Dedicated for the Curation of Geochemical Data Sets in Analytical Laboratories

    Yusuke Yachi, Hiroshi Kitagawa, Tak Kunihiro, Eizo Nakamura

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   38 ( 1 )   95 - 102   2014.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1111/j.1751-908X.2013.00205.x

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  • Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft

    Eizo Nakamura, Akio Makishima, Takuya Moriguti, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Tatsuki Tsujimori, Chie Sakaguchi, Hiroshi Kitagawa, Tsutomu Ota, Yusuke Yachi, Toru Yada, Masanao Abe, Akio Fujimura, Munetaka Ueno, Toshifumi Mukai, Makoto Yoshikawa, Jun'ichiro Kawaguchi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 11 )   E624 - E629   2012.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1073/pnas.1116236109

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  • Establishment of comprehensive analytical system for terrestrial and extraterrestrial materials behind the Initial analysis of particles from an asteroid, Itokawa, returned by Hayabusa Spacecraft Invited Reviewed

    Nakamura, E., Makishima, A., Moriguti, T., Kobayashi, K., Tanaka, R., Kunihiro, T., Tsujimori, T.

    Journal of the Surface Science Society of Japan (Hyomen Kagaku)   33 ( 12 )   681 - 686   2012

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.1380/jsssj.33.681

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  • In situ ion-microprobe determination of trace element partition coefficients for hornblende, plagioclase, orthopyroxene, and apatite in equilibrium with natural rhyolitic glass, Little Glass Mountain Rhyofite, California Reviewed

    Brophy J.G., Ota T., Kunihiro T., Tsujimori T., Nakamura E.

    American Mineralogist   96 ( 11-12 )   1838 - 1850   2011.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2138/am.2011.3857

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  • Melt inclusion Pb-isotope analysis by LA-MC-ICPMS: Assessment of analytical performance and application to OIB genesis

    Bence Paul, Jon D. Woodhead, Janet Hergt, Leonid Danyushevsky, Takuya Kunihiro, Eizo Nakamura

    Chemical Geology   289 ( 3-4 )   210 - 223   2011.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.chemgeo.2011.08.005

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  • Sr-Nd-Hf-Pb isotopic characteristics of North-Western and Southern Ethiopian lithospheric mantle Reviewed

    Melesse A, Kunihiro T, Ota T, Tanaka R, Moriguti T, Nakamura E

    Geochimica Et Cosmochimica Acta   74 ( 12 )   A697   2010

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  • Elemental and isotopic abundances of lithium in chondrule constituents in the Allende meteorite

    Seiji Maruyama, Masaki Watanabe, Tak Kunihiro, Eizo Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   73 ( 3 )   778 - 793   2009.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2008.10.039

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  • MegaSIMS: a SIMS/AMS hybrid for measurement of the Sun's oxygen isotopic composition

    Peter H. Mao, Donald S. Burnett, Christopher D. Coath, George Jarzebinski, Takuya Kunihiro, Kevin D. McKeegan

    Applied Surface Science   255 ( 4 )   1461 - 1464   2008.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apsusc.2008.05.175

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  • Boron cycling by subducted lithosphere; insights from diamondiferous tourmaline from the Kokchetav ultrahigh-pressure metamorphic belt

    Tsutomu Ota, Katsura Kobayashi, Takuya Kunihiro, Eizo Nakamura

    Geochimica et Cosmochimica Acta   72 ( 14 )   3531 - 3541   2008.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2008.05.002

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  • Oxygen-isotopic compositions of low-FeO relicts in high-FeO host chondrules in Acfer 094, a type 3.0 carbonaceous chondrite closely related to CM

    Tak Kunihiro, Alan E. Rubin, John T. Wasson

    Geochimica et Cosmochimica Acta   69 ( 15 )   3831 - 3840   2005.8

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2005.01.031

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  • Carbon-rich chondritic clast PV1 from the Plainview H-chondrite regolith breccia: Formation from H3 chondrite material by possible cometary impact

    Alan E. Rubin, Josep M. Trigo-Rodriguez, Takuya Kunihiro, Gregory W. Kallemeyn, John T. Wasson

    Geochimica et Cosmochimica Acta   69 ( 13 )   3419 - 3430   2005.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2004.11.001

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  • Microscopic oxygen isotopic homogeneity/heterogeneity in the matrix of the Vigarano CV3 chondrite

    Takuya Kunihiro, Kazuhide Nagashima, Hisayoshi Yurimoto

    Geochimica et Cosmochimica Acta   69 ( 3 )   763 - 773   2005.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2004.07.024

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  • Oxygen-isotopic compositions of relict and host grains in chondrules in the Yamato 81020 CO3.0 chondrite

    Takuya Kunihiro, Alan E. Rubin, Kevin D. McKeegan, John T. Wasson

    Geochimica et Cosmochimica Acta   68 ( 17 )   3599 - 3606   2004.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2004.02.011

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  • Initial 26Al/27Al in carbonaceous-chondrite chondrules: Too little 26Al to melt asteroids

    Takuya Kunihiro, Alan E. Rubin, Kevin D. McKeegan, John T. Wasson

    Geochimica et Cosmochimica Acta   68 ( 13 )   2947 - 2957   2004.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2004.02.006

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  • High precision isotope micro-imaging of materials Reviewed

    Hisayoshi Yurimoto, Kazuhide Nagashima, Takuya Kunihiro

    Applied Surface Science   203-204   793 - 797   2003.1

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1016/S0169-4332(02)00825-5

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  • Noise characteristics of stacked CMOS active pixel sensor for charged particles Reviewed

    Takuya Kunihiro, Kazuhide Nagashima, Isao Takayanagi, Junichi Nakamura, Koji Kosaka, Hisayoshi Yurimoto

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   470 ( 3 )   512 - 519   2001.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/S0168-9002(01)00795-1

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  • Output characteristics of stacked CMOS-type active pixel sensor for charged particles Reviewed

    Kazuhide Nagashima, Takuya Kunihiro, Isao Takayanagi, Junichi Nakamura, Koji Kosaka, Hisayoshi Yurimoto

    Surface and Interface Analysis   31 ( 2 )   131 - 137   2001.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/sia.968

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  • A low dark current stacked CMOS-APS for charged particle imaging Reviewed

    Isao Takayanagi, Junichi Nakamura, El Sayed Eid, Eric R. Fossum, Kazuhide Nagashima, Takuya Kunihiro, Hisayoshi Yurimoto

    Technical Digest-International Electron Devices Meeting   551 - 554   2001

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1109/IEDM.2001.979566

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MISC

  • 小惑星リュウグウの彗星起源説に関する理論的検討

    三浦均, 中村栄三, 国広卓也

    日本惑星科学会秋季講演会予稿集(Web)   2021   2021

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  • 地球惑星物質総合解析システムの構築と応用

    中村栄三, 牧嶋昭夫, 森口拓弥, 小林桂, 田中亮吏, 国広卓也, 北川宙, 太田努, 坂口千恵, 山中正博

    法政大学イオンビーム工学研究所シンポジウム講演予稿集   36th   2017

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  • Depository for references of earth and analytical materials: its concept and status on 2013

    北川宙, 谷内勇介, 国広卓也, 中村栄三

    宇宙航空研究開発機構研究開発報告 JAXA-RR-   ( 13-010 )   2014

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  • The oxygen isotopic composition of the sun inferred from captured solar wind

    K. D. McKeegan, A. P.A. Kallio, V. S. Heber, G. Jarzebinski, P. H. Mao, C. D. Coath, T. Kunihiro, R. C. Wiens, J. E. Nordholt, R. W. Moses, D. B. Reisenfeld, A. J.G. Jurewicz, D. S. Burnett

    Science   332 ( 6037 )   1528 - 1532   2011.6

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    Publishing type：Book review, literature introduction, etc.  

    DOI： 10.1126/science.1204636

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  • In situ geochemistry of garnet peridotites of Lashaine, Tanzania craton: Re-fertilization in subcratonic lithospheric mantle

    A. Basu Sarbadhikari, T. Tsujimori, T. Moriguti, T. Kunihiro, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 12 )   A58 - A58   2010.6

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    Language：English   Publishing type：Research paper, summary (international conference)  

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  • A hercynite-rich inclusion in the vigarano CV3 chondrite

    S. Maruyama, T. Kunihiro, E. Nakamura

    METEORITICS & PLANETARY SCIENCE   43 ( 7 )   A91 - A91   2008.7

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  • Large-scale fluid flow in a cold subduction-zone: SIMS Li-isotope study of jadeitite veins in Franciscan metagraywacke

    T. Tsujimori, T. Moriguti, T. Kunihiro, K. Kobayashi, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 15 )   A1040 - A1040   2007.8

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  • Dark Current Reduction in Stacked CMOS-APS for Charged Particle Imaging

    Takayanagi Isao, Nakamura Junichi, Fossum Eric R., Nagashima Kazuhide, Kunihiro Takuya, Yurimoto Hisayoshi

    ITE Technical Report   26 ( 0 )   7 - 12   2002

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    Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

    A stacked CMOS active pixel sensor (APS) with a newly devised pixel structure for charged particle detection was designed, fabricated and tested. Hot carrier generation at the readout transistor inside the pixel was suppressed, thereby low leakage current as low as 5×10^<-8> V/s at the pixel electrode under low operation temperature was achieved. Ion conversion characteristics were tested with the imager installed in a projection-type Secondary Ion Mass spectrometer (SIMS). Total noise floor and dynamic range were measured to be 3 ions and 84dB for 10keV incident Al ions, respectively.

    DOI： 10.11485/itetr.26.26.0_7

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  • A CAI crystal having heterogeneous O isotopic anomaly: Measurement of two-dimensional distribution

    Itoh Shoichi, Nagashima Kazuhide, Kunihiro Takuya, Yurimoto Hisayoshi

    Abstracts of Annual Meeting of the Geochemical Society of Japan   49 ( 0 )   110 - 110   2002

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    Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

    南極産炭素質隕石Y81020 (CO3.0)中に見つかった粗粒CAIは内部がメリライトとファッサイトからなりWork-Loveringリムに囲まれている。このCAIを同位体顕微鏡を用いて空間分解能2ミクロンの酸素同位体分布マップを得ることに成功した。本発表ではその分析装置と分析法を示し、その結果の信頼性を吟味する。

    DOI： 10.14862/geochemproc.49.0.110.0

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  • A CAI crystal having heterogeneous O isotopic anomaly: Formation process

    Nagashima Kazuhide, Itoh Shoichi, Kunihiro Takuya, Yurimoto Hisayoshi

    Abstracts of Annual Meeting of the Geochemical Society of Japan   49 ( 0 )   111 - 111   2002

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    Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

    同位体顕微鏡による酸素同位体分布マップとEPMAによる元素分布マップを比較することにより南極産炭素質隕石Y81020 (CO3.0)中に見つかった粗粒CAIの鉱物内の同位体不均一が鉱物の結晶成長に伴いどのようにして導入されたのかが議論された。酸素同位体以上は単一プロセスでCAI中に記録されたのではなく、非平衡状態における鉱物の溶融と結晶成長によるものであった。

    DOI： 10.14862/geochemproc.49.0.111.0

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  • Application of Active Pixel Sensor for Charged Particles to Mass Spectrometry

    Nagashima K., Kunihiro T., Takayanagi I., Nakamura J., Kosaka K., Yurimoto H.

    ITE Technical Report   24 ( 0 )   13 - 18   2000

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    Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

    Output characteristics of two-dimensional solid-state detector for charged particles has been analyzed by ion irradiation with keV level energy. The detector was designed by CMOS rule and constructed as stacked CMOS-device[1]. The detector was operated under nondestructive readout mode due to correction of fixed pattern noises among pixels and reset noise of a pixel. The output signals of a pixel correlated linearly with incoming ions over the range of four orders of magnitude. Non-linear effects of the output is about 10% over the whole dynamic range of a pixel. The dominant effects of the non-linear components are reset voltage drop down by overlap capacitance. After correction of the drop down effect the nonlinearity reduced to percent level, the percent level nonlinearity was due to voltage dependence of pixel capacitance with ion irradiation.

    DOI： 10.11485/itetr.24.3.0_13

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  • 二次元固体撮像素子SCAPSの出力特性と雑音特性の解析

    国広卓也, 永島一秀, 高柳功, 中村淳一, 小坂光二, いり本尚義

    日本惑星科学会秋季講演会予稿集   2000   2000

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  • 荷電粒子検出用二次元半導体素子の質量分析計への応用

    いり本尚義, 永島一秀, 国広卓也, 高柳功, 中村淳一, 小坂光二

    搭載機器基礎開発成果報告書   13   2000

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  • CMOS Image Sensor for Charge Particle Detection

    Takayanagi Isao, Nakamura Jun-ici, Yurimoto Hisayoshi, Kunihiro Takuya, Nagashima Kazuhide, Kosaka Koji

    IEICE technical report. Electronic information displays   99 ( 374 )   7 - 12   1999.10

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    A stacked CMOS active pixel image sensor has been developed for detecting charge particles. Wide dynamic range of 80 dB and good linearity have been demonstrated with a charge particle imaging system which incorporates a secondary ion mass spectrometer (SIMS). Noise measurement results suggest that dynamic range exceeding 100 dB can be obtained if the reset noise is suppressed by utilizing the nondestructive readout (NDRO) capability of the CMOS APS.

    DOI： 10.11485/itetr.23.60.0_7

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  • Development of Solid-State Imager for Charged Particles

    Yurimoto H., Kunihiro T., Nagashima K., Takayanagi I., Kosaka K.

    ITE Technical Report   23 ( 0 )   19 - 23   1999

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    Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

    Charged particles such as ion and electrons with keV order kinetic energy are important for probes and signals for surface analyses. Many detection systems have been developed for measurement of two-dimensional distribution for the particles. However, capabilities of solid-state area detector are not sufficient for quantitative analysis for the charged particles, although solid-state imager such as charge coupled device has been great succeeded to photon detection for optical spectroscopy. This paper discussed performance and characteristics of a novel solid-state imager for charged particles. This device is useful to charged particle detection such as mass spectrometry and electron microscopy.

    DOI： 10.11485/itetr.23.5.0_19

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  • Development of Solid-State Imager for Charged Particles.

    ゆり本尚義, 国広卓也, 永島一秀, 高柳功, 小坂光二

    画像電子学会研究会講演予稿   168th   1999

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  • CMOS Image Sensor for Charge Particle Detection.

    高柳功, 中村淳一, ゆり本尚義, 国広卓也, 永島一秀, 小坂光二

    電子情報通信学会技術研究報告   99 ( 374(EID99 47-54) )   1999

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  • Noise Analysis of Active Pixel Sensor for Charged Particles.

    国広卓也, 永島一秀, 高柳功, 平田岳史, ゆり本尚義

    地球惑星科学関連学会合同大会予稿集   1998   1998

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  • Output characteristics of Active Pixel Sensor(APS) for charged particle.

    永島一秀, 国広卓也, 高柳功, 平田岳史, ゆり本尚義

    地球惑星科学関連学会合同大会予稿集   1998   1998

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  • Development of two-dimentional ion detector (Amplified MOS Imager) for the isotopic study using mass spectrometric technique.

    国広卓也, 永島一秀, 小坂光二, 平田岳史, ゆり本尚義

    日本惑星科学会秋季講演会予稿集   1997   1997

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  • Development of Multiple Ion Detection Using Ampliphied MOSImager.

    永島一秀, 国広卓也, 小坂光二, ゆり本尚義, 平田岳史

    日本地球化学会年会講演要旨集   1997   1997

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  • Development of Two-Dimentional Ion Detector (Amplified MOS Imager) For the Isotopic Study Using Mass Spectrometric Technique. Development of Digital Processing Unit.

    国広卓也, ゆり本尚義, 平田岳史

    地球惑星科学関連学会合同大会予稿集   1996   1996

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  • Development of AMI ion detector for sensitive-multiple collection mass spectrometry.

    永島一秀, 国広卓也, ゆり本尚義, 小坂光二, 平田岳史

    日本地球化学会年会講演要旨集   1996   1996

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Research Projects

  • Duration of fluid existence on an asteroid

    Grant number：19K03952  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kunihiro Takuya

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    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    Twenty-six trace-element-abundances of chondrule constituents were determined using micro beam techniques. According to mass balance calculation, a chondrule has been interacted with Si-rich melt prior to aqueous alteration on an asteroid. Step-wise leaching technique using acid was applied to chondrules to extrace glass. Rubidium-Sr dating was applied to the separated chondrules and yielded age of a few handreds million after the birth of the solar system. Exictence of ice or fluid on the asteroid in such time scale was implied.

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  • A study to evaluate fluid-related process on asteroids by chondrules

    Grant number：22740353  2010 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    KUNIHIRO Takuya

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    Grant amount：\3510000 （ Direct expense: \2700000 、 Indirect expense：\810000 ）

    The main subject of this research is to develop in-situ analytical technique to determine concentration of fluid-mobile elements and discuss elemental re-distribution at small bodies on the Solar system by fluid related processes. The author succeeded to optimize sample preparation and to have reliable olivine standards by conventional technique, and established in-situ boron-quantitative-analysis with sub-ppm level. The technique was applied to chondrules and abundances of boron in each phase were determined.

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  • Behavior of lithium isotopes in subduction zone mantle

    Grant number：21540505  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    OTA Tsutomu, MORIGUCHI Takuya, KUNIHIRO Takuya, JAMES G. brophy

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    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    This study aimed to decipher parameters of lithium partitioning and lithium isotope fractionation between mantle olivine and aqueous fluid, in terms of experimental petrology, in order to understand chemical interaction between surficial and mantle materials in deep subduction zone, which has defined a chemical evolution of the Earth. Lithium isotopic compositions obtained from synthesized olivines suggested that the subduction-zone mantle could have been more significantly fractionated in lithium isotope, rather than expected by previous studies.

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  • コンドリュールの年代測定と局所酸素同位体分析

    Grant number：18840030  2006 - 2007

    日本学術振興会  科学研究費助成事業  若手研究(スタートアップ)

    国広 卓也

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    Grant amount：\2760000 （ Direct expense: \2760000 ）

    隕石を用いた局所分析的手法の確立とコンドリュールの年代測定をめざした.以下に研究実績の概要を箇条書きにする.
    *二次イオン質量分析法を用いた微小分析法の技術的開発を行った.ディオ・レンズを導入し,プローブ・ビーム径をこれまでの約半分にまでしぼることを可能とした.自動センタリング手法を開発し適用した.その結果試料のマウント間での別状態の違いが再現性に最も影響を与えることがわかった.
    *同位体分析における再現性を向上させるために自動研磨の手法を開発した.この結果マウント・レズンと試料の高さの違いを1ミクロン以下におさえることが可能となった.同一試料内での精度が0.2‰であるのに対して,異なるマウントに載る同一試料の再現精度を1‰にまで高めることができた.
    *コンドリュール・ガラスの酸素同位体分析における確度を向上させるためにコンドリュール・メルトに近い組成をもつをもつ10種のガラス試料の合成(An-Ab, En-Diシリーズ)を行った。これらの試料の同位体組成は昨年度作成したスパイクを用いて変化させ,実際の同位体組成はレーザー加熱型ガス質量分析法を用いて0.1‰の精度で求めた.
    *上記の試料を用いて,コンドリュール・ガラスの酸素同位体分析を行った.酸素同位体組成と比較し二次変質の影響を受けやすいアルカリ元素の局所同位体分析を同一試料に対して行い水質変成プロセスを検討した.また二次変成プロセスに注目して,コンドリュールのアルカリ年代測定を行った結果,報告されている鉛年代と比較して有意に若い年代を得た.

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  • 同位体顕微鏡による二次元同位体分析法の開発と太陽系初期の物質化学的進化の解明

    Grant number：00J10106  2000 - 2001

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    国広 卓也

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    Grant amount：\2000000 （ Direct expense: \2000000 ）

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