2026/09/08 更新

写真a

サカグチ　チエ
坂口　千恵
SAKAGUCHI Chie
所属
学術研究院先鋭研究領域（惑星物質） 助手
職名
助手
外部リンク

学位

  • 修士（理学） （ 茨城大学 ）

 

論文

  • Magma sources in the northern part of the Cretaceous Okhotsk-Chukotka volcanic belt (NE Asia): Spatial zonation, temporal variations, and links to tectonic history of the basement

    P.L. Tikhomirov, I.E. Lebedev, T.E. Bagdasaryan, E.A. Kalinina, C. Sakaguchi, K. Kobayashi

    Gondwana Research   2026年5月

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.1016/j.gr.2025.12.006

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  • Chemical Geodynamics of Granitoid Magmatism During a Pacific‐Philippine Sea Plate Transition in Southwest Japan

    Nghiem V. Dao, Tsegereda A. Yemer, Tulibako T. Mwaisuba, Chie Sakaguchi, Hiroshi Kitagawa, Katsura Kobayashi, Teruyoshi Imaoka, Eizo Nakamura

    Geochemistry, Geophysics, Geosystems   2026年5月

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.1029/2026GC012945

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  • Deep recycling of volatile elements in the mantle: Evidence from the heterogeneous B isotope in intra-plate basalts 査読

    Yan-Qing Li, Hiroshi Kitagawa, Chang-Qian Ma, Eizo Nakamura, Chie Sakaguchi, Katsura Kobayashi, Xiang-Yun Hu

    Geoscience Frontiers   15 ( 6 )   2024年11月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1016/j.gsf.2024.101900

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  • 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年4月

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    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

  • 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

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.3390/universe9060293

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  • 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

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    掲載種別：研究論文（学術雑誌）  

    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年5月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：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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  • 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年3月

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    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

  • 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年6月

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    掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Academy  

    DOI： 10.2183/pjab.98.015

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  • Geochronology, Petrogenesis and Oxidation State of the Northparkes Igneous Suite, New South Wales, Australia: Implications for Magma Fertility

    Hongda Hao, Ian H. Campbell, David R. Cooke, Eizo Nakamura, Chie Sakaguchi

    ECONOMIC GEOLOGY   116 ( 5 )   1161 - 1187   2021年8月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.5382/econgeo.4825

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  • Boron Isotope Fractionation between Liquid and Gas at Saturated Water Vapor Line

    A. Yu Bychkov, I. Yu Nikolaeva, Y. V. Bychkova, Ch Sakaguchi, E. Nakamura

    Geochemistry International   58 ( 11 )   1257 - 1261   2020年11月

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.1134/S001670292011004X

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  • Various Ages of Recycled Material in the Source of Cenozoic Basalts in SE China: Implications for the Role of the Hainan Plume

    Yan-Qing Li, Hiroshi Kitagawa, Eizo Nakamura, Changqian Ma, Xiangyun Hu, Katsura Kobayashi, Chie Sakaguchi

    JOURNAL OF PETROLOGY   61 ( 6 )   2020年6月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1093/petrology/egaa060

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  • A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples

    Xiaoyu Zhou, Ryoji Tanaka, Masahiro Yamanaka, Chie Sakaguchi, Eizo Nakamura

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   43 ( 4 )   611 - 633   2019年12月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1111/ggr.12280

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  • Boron Isotopes in the Puga Geothermal System, India, and Their Implications for the Habitat of Early Life 国際誌

    Luke H. Steller, Eizo Nakamura, Tsutomu Ota, Chie Sakaguchi, Mukund Sharma, Martin J. Van Kranendonk

    ASTROBIOLOGY   19 ( 12 )   1459 - 1473   2019年12月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1089/ast.2018.1966

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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年4月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    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年3月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1111/ggr.12245

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  • Platinum-Group Element Geochemistry of the Escondida Igneous Suites, Northern Chile: Implications for Ore Formation

    Hongda Hao, Ian H. Campbell, Jeremy P. Richards, Eizo Nakamura, Chie Sakaguchi

    JOURNAL OF PETROLOGY   60 ( 3 )   487 - 514   2019年3月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1093/petrology/egz004

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  • Petrology, Trace Element and Sr, Nd, Hf Isotope Geochemistry of the North Lanzo Peridotite Massif (Western Alps, Italy)

    Luisa Guarnieri, Eizo Nakamura, Giovanni B. Piccardo, Chie Sakaguchi, Nobumichi Shimizu, Riccardo Vannucci, Alberto Zanetti

    JOURNAL OF PETROLOGY   53 ( 11 )   2259 - 2306   2012年11月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1093/petrology/egs049

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

    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年3月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1073/pnas.1116236109

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  • Timescales of magma differentiation from basalt to andesite beneath Hekla Volcano, Iceland: Constraints from U-series disequilibria in lavas from the last quarter-millennium flows

    Takele A. Chekol, Katsura Kobayashi, Tetsuya Yokoyama, Chie Sakaguchi, Eizo Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   75 ( 1 )   256 - 283   2011年1月

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    記述言語：英語   掲載種別：研究論文（学術雑誌）  

    DOI： 10.1016/j.gca.2010.10.001

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  • An assessment of upper mantle heterogeneity based on abyssal peridotite isotopic compositions

    J. M. Warren, N. Shimizu, C. Sakaguchi, H. J.B. Dick, E. Nakamura

    Journal of Geophysical Research: Solid Earth   114 ( 12 )   2009年

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    掲載種別：研究論文（学術雑誌）  

    DOI： 10.1029/2008JB006186

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  • Evolution of an isotopically depleted mantle xenolith from salt lake crater, Hawaii 査読

    E Nakamura, C Sakaguchi, R Tanaka, T Moriguti, Kushiro, I

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A324 - A324   2003年9月

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    記述言語：英語  

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  • Comprehensive geochemical analyses of small amounts (< 100 mg) of extraterrestrial samples for the analytical competition related to the sample return mission MUSES-C

    中村 栄三, 牧嶋 昭夫, 森口 拓弥, 小林 桂, 坂口 千恵, 横山 哲也, 田中 亮史, 栗谷 豪, 竹井 宏行, Nakamura Eizo, Makishima Akio, Moriguti Takuya, Kobayashi Katsura, Sakaguchi Chie, Yokoyama Tetsuya, Tanaka Ryoji, Kuritani Takeshi, Takei Hiroyuki

    The Institute of Space and Astronautical Science report. S.P. : The First Open Competition for the MUSES-C Asteroidal Sample Preliminary Examination Team   ( 16 )   49 - 101   2003年3月

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    記述言語：英語   出版者・発行元：宇宙科学研究所  

    資料番号: SA0200006000

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▼全件表示

MISC

  • 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年

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  • Geochemistry of volcanic and plutonic rocks from the southern Musoma-Mara greenstone belt: Implication for the evolution of the Tanzania craton

    C. W. Messo, K. Yamashita, K. Kobayashi, A. Makishima, C. Sakaguchi, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A622 - A622   2008年7月

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    記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）  

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  • 同位体希釈法と内標準法を併用した、ICP質量分析法によるLi, Be, Rb, Sr, Y, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, Th, Uの同時測定法の開発

    牧嶋 昭夫, 北川 宙, 坂口 千恵, 中村 栄三

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集   2004   237 - 237   2004年9月

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    記述言語：英語   出版者・発行元：日本鉱物科学会  

    同位体希釈法と内標準法を併用した、ICP質量分析法によるLi, Be, Rb, Sr, Y, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, Th, Uの同時測定法の開発をおこなった。

    DOI： 10.14824/jampeg.2004.0.64.0

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  • ハワイアンプリューム端成分としてのマントル捕獲岩の発見?

    中村 栄三, 坂口 千恵, 田中 亮吏, 森口 拓弥, 久城 育夫

    日本岩石鉱物鉱床学会 学術講演会 講演要旨集   2002   251 - 251   2002年

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    出版者・発行元：日本鉱物科学会  

    DOI： 10.14824/jampeg.2002.0.251.0

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