研究者詳細 - 田中　亮吏

論文 - 田中　亮吏

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Petrogenesis of the Rantila meteorite fall and implications for the origin of aubrites

Yash Srivastava, Amit, Varsha M. Nair, Avadh Kumar, Yogita Kadlag, Ramakant R. Mahajan, Neeraj Srivastava, Neha Panwar, Aditya Das, Ryoji Tanaka, James Day, Anil D. Shukla, Dwijesh Ray, Abhishek J. Verma, Alka Rani, Garima Arora, Dipak K. Panda, S. Vijayan, Anil Bhardwaj

Meteoritics & Planetary Science 2025年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

<jats:title>Abstract</jats:title><jats:p>Aubrites are rare meteorites from highly reduced differentiated parent bodies. The Rantila meteorite was recovered soon after falling on 17 August 2022 at Rantila and Ravel villages in Gujarat state, India. We report the petrography, mineralogy, chemical composition, oxygen‐ and chromium‐isotope compositions, along with reflectance spectroscopy, all showing that Rantila is an aubrite. Coarse enstatite and diopside grains constitute the main mass of Rantila, while mm‐wide fracture domains pervade the coarse enstatites. In the fractures, comminuted enstatite, diopside blebs, olivine, a plagioclase–silica assemblage, sulfides, and metals occur. Rantila consists of enstatite (>85 vol%), diopside (~8 vol%), forsterite, albite, and silica along with various sulfides and Fe‐Ni alloys. The concentration of rare earth elements is ~1–2 × CI, consistent with main group aubrites. Noble gas and nitrogen isotopic analyses reveal young exposure ages (13.81 ± 6.47 Ma), a heterogeneous nitrogen isotopic composition, and a major K‐Ar resetting event around 3.2 ± 0.4 Ga in the parent body of Rantila. The bulk oxygen isotope values are within the range of aubrites. The chromium isotopic values of Rantila are consistent with main group aubrites. The mineral assemblages, texture, and crystallization modeling suggest that Rantila had an igneous origin. The mineral assemblages in fractures indicate the involvement of external melt possibly during an impact‐fracturing event, which aligns well with the heterogeneous N isotopic composition. Additionally, Rantila shows a wider range of oxygen isotopes than other aubrites suggesting some extent of O isotopic heterogeneity, likely stemming from exogenous processes. The variation in intra‐sample bulk O and N isotope values implies inherent heterogeneity within the main group aubrites, potentially caused by late‐stage impact contamination.</jats:p>

DOI： 10.1111/maps.14357

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Meteoritic and asteroidal amino acid heterogeneity: Implications for planetesimal alteration conditions and sample return missions

Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Katsura Kobayashi, Ryoji Tanaka, Eizo Nakamura

Earth and Planetary Science Letters 2025年3月

Relative importance of Asian-dust-derived micas estimated from oxygen isotopic analysis of fine quartz on specific retention of radiocesium in Andosols in Tohoku Region, Japan 査読

Ryoji Tanaka

Soil Science and Plant Nutrition 2024年8月

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

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年4月

掲載種別：研究論文（学術雑誌）出版者・発行元：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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その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ad276a/pdf

Determination of mass-dependent chromium isotopic compositions in geological samples by double spike-total evaporation-thermal ionization mass spectrometry (DS-TE-TIMS) 査読

Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura

Analytica Chimica Acta 2023年10月

Organic Matter in the Asteroid Ryugu: What We Know So Far 招待査読

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

Life 2023年6月

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

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

Universe 2023年6月

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

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年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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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その他リンク： https://www.nature.com/articles/s41467-023-37107-6

Malotas (b), a new eucrite from an old fall 査読

Marcela E. Saavedra, Julia Roszjar, My E. I. Riebe, María E. Varela, Shuying Yang, Munir Humayun, Ryoji Tanaka, H. Busemann

Meteoritics & Planetary Science 57 ( 11 ) 2081 - 2101 2022年11月

A rapid method of simultaneous chromatographic purification of Li and Mg for isotopic analyses using MC-ICP-MS 査読

Wei Zhang, Ryoji Tanaka, Hiroshi Kitagawa, Madeleine Bohlin, Eizo Nakamura

International Journal of Mass Spectrometry 480 116893 - 116893 2022年10月

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

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年6月

The ice-organic-silicate contents of small solar system bodies: indicators for a comet to asteroid evolutionary pathway 査読

Havishk Tripathi, Christian Potiszil, Ryoji Tanaka, Eizo Nakamura

Monthly Notices of the Royal Astronomical Society 2022年4月

掲載種別：研究論文（学術雑誌）出版者・発行元：Oxford University Press (OUP)

ABSTRACT

Comets and asteroids have traditionally been separated categories, but main belt comets skew this view, portraying a possible intermediate stage between these two endmembers. Investigating the relationship between these bodies can improve our understanding of the formation and evolution of the Solar System and help to identify potentially interesting parent bodies from within our solar system, for future sample return missions. Furthermore, elucidating the ice-organic-silicate ratios of potential meteorite parent bodies can help to explain the observed isotopic ratios and petrography of meteorite samples. While the ice-organic-silicate ratios of particular bodies have been estimated, there has been no study undertaken which compares different types of bodies in terms of their ice-organic-silicate ratios. Therefore, this study presents a geophysical-chemical mass balance model, to estimate the ice-organic-silicate ratios of comets, main belt comets and asteroids. The results drawn from the model form a diagonal trend upon an ice-organic-silicate ternary diagram, in which comets and main belt comets plot together at generally higher ice contents, with asteroids typically plotting at lower ice contents. However, an overlap between all three body types is observed and supports the scenario in which comets, main belt comets and asteroids are genetically linked.

DOI： 10.1093/mnras/stac1068

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

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年2月

Liquid-phase water isotope separation using graphene-oxide membranes 査読

Karin Ching, Andy Baker, Ryoji Tanaka, Tingwen Zhao, Zhen Su, Rodney S. Ruoff, Chuan Zhao, Xianjue Chen

Carbon 2022年1月

Mineralogical Factors Controlling the Ability to Retain 137Cs in Andosols in Japan 査読

Atsushi Nakao, Shiori Uno, Ryoji Tanaka, Junta Yanai

Behavior of Radionuclides in the Environment III 365 - 375 2022年

掲載種別：論文集(書籍)内論文出版者・発行元：Springer Singapore

Mineralogical composition in Andosols in Japan was elucidated to clarify the type and provenance of minerals controlling their ability to retain 137Cs. In fine particles (<20 µm), short-range-ordered minerals were dominant, whereas quartz, mica, and felspars were contained as major crystalline minerals in all the soils investigated. Radiocesium interception potential, a widely used indicator of the ability to retain 137Cs, positively correlated with mica and quartz content while not with K-feldspars. Mica and quartz were linearly correlated, suggesting the similarity in their origins. Isolated fine quartz grains were analyzed for oxygen isotopic ratio (d18O) as an indicator of their provenance. Most of the quartz showed the d18O values of 15-17‰, very close to those in the Gobi Desert, while clearly differentiated those from volcanic origins. These results showed that radiocesium retention ability of Andosols is primarily controlled by the proportion of Asian dust incorporated into volcanic ashes.

DOI： 10.1007/978-981-16-6799-2_16

Scopus

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Novel nickel isolation procedure for a wide range of sample matrices without using dimethylglyoxime for isotope measurements using MC-ICP-MS 査読国際誌

Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura

Analytica Chimica Acta 1181 338934 - 338934 2021年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier {BV}

Nickel isotope ratios have traditionally been used as an important tracer in cosmochemistry, and recently, it has gained attention in geochemistry, biochemistry, and environmental sciences with the development of MC-ICP-MS. Purification of Ni before isotope measurement is mandatory for obtaining precise data, which has been commonly achieved with ion-exchange chromatography, employing dimethylglyoxime (DMG) as a chelating agent for Ni. However, it has been pointed out that the use of DMG can adversely affect the isotope measurement due to insufficient Ni recovery and mass bias during measurement caused by the remaining DMG. Ni isolation procedures without the usage of DMG were innovated, but they have disadvantages such as the necessity of complex separation methods, high Ni blank, and matrix-dependent Ni recovery. Here, we present a simple Ni isolation procedure without using DMG but with the aid of oxalic acid along with common inorganic acids, achieving near-complete recovery of Ni with low blanks [0.7 ± 0.3 ng (2SD, n = 4)] only using three ion exchange column steps. To validate our method and strengthen the Ni isotope database of reference materials, 60Ni/58Ni of 20 geological reference materials, covering wide matrix compositions, were measured by MC-ICP-MS using the double-spike method. The results have shown that high recovery of Ni, independent of the sample matrix elements was achieved (98 ± 4%) and the 60Ni/58Ni was measured with a 2SD of 0.006-0.084‰ from samples containing 100-200 ng Ni.

DOI： 10.1016/j.aca.2021.338934

PubMed

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A New Insight Into Seawater-Basalt Exchange Reactions Based on Combined δ18O—Δ′17O—87Sr/86Sr Values of Hydrothermal Fluids From the Axial Seamount Volcano, Pacific Ocean 査読

Ryoji Tanaka

Frontiers in Earth Science 2021年9月

掲載種別：研究論文（学術雑誌）

<jats:p>The δ<jats:sup>18</jats:sup>O values of submarine vent fluids are controlled by seawater-basalt exchange reactions, temperature of exchange, and to a lesser extent, by phase separation. These variations are translated into the δ<jats:sup>18</jats:sup>O values of submarine hydrothermal fluids between ca. 0 and + 4‰, a range defined by pristine seawater and equilibrium with basalt. Triple oxygen isotope systematics of submarine fluids remains underexplored. Knowing how δ<jats:sup>17</jats:sup>O and δ<jats:sup>18</jats:sup>O change simultaneously during seawater-basalt reaction has a potential to improve i) our understanding of sub-seafloor processes and ii) the rock-based reconstructions of ancient seawater. In this paper, we introduce the first combined δ<jats:sup>17</jats:sup>O-δ<jats:sup>18</jats:sup>O-<jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr dataset measured in fluids collected from several high-temperature smoker- and anhydrite-type vent sites at the Axial Seamount volcano in the eastern Pacific Ocean. This dataset is supplemented by measurements of major, trace element concentrations and pH indicating that the fluids have reacted extensively with basalt. The salinities of these fluids range between 30 and 110% of seawater indicating that phase separation is an important process, potentially affecting their δ<jats:sup>18</jats:sup>O. The <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr endmember values range between 0.7033 and 0.7039. The zero-Mg endmember δ<jats:sup>18</jats:sup>O values span from -0.9 to + 0.8‰, accompanied by the Δ′<jats:sup>17</jats:sup>O<jats:sub>0.528</jats:sub> values ranging from around 0 to −0.04‰. However, the trajectory at individual site varies. The endmember values of fluids from focused vents exhibit moderate isotope shifts in δ′<jats:sup>18</jats:sup>O up to +0.8‰, and the shifts in Δ′<jats:sup>17</jats:sup>O are small, about −0.01‰. The diffuse anhydrite-type vent sites produce fluids that are significantly more scattered in δ′<jats:sup>18</jats:sup>O—Δ′<jats:sup>17</jats:sup>O space and cannot be explained by simple isothermal seawater-basalt reactions. To explain the observed variations and to provide constraints on more evolved fluids, we compute triple O isotope compositions of fluids using equilibrium calculations of seawater-basalt reaction, including a non-isothermal reaction that exemplifies complex alteration of oceanic crust. Using a Monte-Carlo simulation of the dual-porosity model, we show a range of possible simultaneous triple O and Sr isotope shifts experienced by seawater upon reaction with basalt. We show the possible variability of fluid values, and the causal effects that would normally be undetected with conventional δ<jats:sup>18</jats:sup>O measurements.</jats:p>

DOI： 10.3389/feart.2021.691699

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Silicon and Oxygen Isotope Evolution of the Inner Solar System 査読

Ryoji Tanaka, Christian Potiszil, Eizo Nakamura

The Planetary Science Journal 2 ( 3 ) 102 - 102 2021年6月

Distance-dependence from volcano for Asian dust inclusions in Andosols: A key to control soil ability to retain radiocesium 査読

Atsushi Nakao, Shiori Uno, Junta Yanai, Hideo Kubotera, Ryoji Tanaka, Robert A. Root, Takashi Kosaki

Geoderma 385 114889 - 114889 2021年3月

Comment on: ‘A simple cryogenic method for efficient measurement of triple oxygen isotopes in silicates’ by Ghoshmaulik et al. (Rapid Commun Mass Spectrom. 2020;34(18):e8833) 査読

Martin F. Miller, Ryoji Tanaka, Richard C. Greenwood

Rapid Communications in Mass Spectrometry 34 ( 22 ) 2020年11月

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