研究者詳細 - 近藤　望

論文 - 近藤　望

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Gravitational stability of iron-rich peridotite melt at Mars’ core-mantle boundary 査読

Yoshio Kono, Chihiro Koyama, Nozomi M. Kondo, Koji Ohara, Hideharu Kuwahara, Ryoichi Nakada, Yuki Watanabe, HirohisaOda, Takehiko Ishikawa

Communications Earth & Environment 6 148 2025年3月

Revised metal-silicate partitioning does not require the Late Veneer

Nozomi Kondo, Hisashi Asanuma, Takashi Yoshino

2025年2月

Pressure-induced polyamorphic transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CaA</mml:mi><mml:msub><mml:mi mathvariant="normal">l</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> glass 査読

Itaru Ohira, Yoshio Kono, Steeve Gréaux, James W. E. Drewitt, Sandro Jahn, Fumiya Noritake, Koji Ohara, Satoshi Hiroi, Nozomi M. Kondo, Rostislav Hrubiak, Yuji Higo, Noriyoshi Tsujino, Sho Kakizawa, Kiyofumi Nitta, Oki Sekizawa

Physical Review B 110 ( 5 ) 2024年8月

Different structural behavior of MgSiO3 and CaSiO3 glasses at high pressures 査読

Nozomi M. Kondo, Yoshio Kono, Itaru Ohira, Rostislav Hrubiak, Koji Ohara, Kiyofumi Nitta, Oki Sekizawa

American Mineralogist 109 ( 6 ) 1045 - 1053 2024年6月

担当区分：筆頭著者掲載種別：研究論文（学術雑誌）出版者・発行元：Mineralogical Society of America

Abstract

Knowledge of the structural behavior of silicate melts and/or glasses at high pressures provides fundamental information for discussing the nature and properties of silicate magmas in the Earth’s interior. The behavior of Si-O structures under high-pressure conditions has been widely studied, while the effect of cation atoms on the high-pressure structural behavior of silicate melts or glasses has not been well investigated. In this study, we investigated the structures of MgSiO3 and CaSiO3 glasses up to 5.4 GPa by in situ X-ray pair distribution function measurements to understand the effect of different cations (Mg2+ and Ca2+) on high-pressure structural behavior of silicate glasses. We found that the structural behavior of MgSiO3 and CaSiO3 glasses are different at high pressures. The structure of MgSiO3 glass changes by shrinking of Si-O-Si angle with increasing pressures, which is consistent with previous studies for SiO2 and MgSiO3 glasses. On the other hand, CaSiO3 glass shows almost no change in Si-Si distance at high pressures, while the intensities of two peaks at ~3.0 and ~3.5 Å change with increasing pressure. The structural change in CaSiO3 glass at high pressure is interpreted as the change in the fraction of the edge-shared and corner-shared CaO6-SiO4 structures. The different high-pressure structural behavior observed in MgSiO3 and CaSiO3 glasses may be the origin of differences in properties, such as viscosity between MgSiO3 and CaSiO3 melts at high pressures. This signifies the importance of different structural behaviors due to different cations in investigations of the nature and properties of silicate magmas in Earth’s interior.

DOI： 10.2138/am-2023-9060

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In situ high-pressure pair distribution function measurement of liquid and glass by using 100 keV pink beam 査読

Yoshio Kono, Koji Ohara, Nozomi M. Kondo, Yuji Higo, Sho Kakizawa, Hirokatsu Yumoto, Takahisa Koyama, Hiroshi Yamazaki, Yasunori Senba, Haruhiko Ohashi, Ichiro Inoue, Yujiro Hayashi, Makina Yabashi

Review of Scientific Instruments 95 ( 1 ) 2024年1月

掲載種別：研究論文（学術雑誌）出版者・発行元：AIP Publishing

Understanding the pressure-induced structural changes in liquids and amorphous materials is fundamental in a wide range of scientific fields. However, experimental investigation of the structure of liquid and amorphous material under in situ high-pressure conditions is still limited due to the experimental difficulties. In particular, the range of the momentum transfer (Q) in the structure factor [S(Q)] measurement under high-pressure conditions has been limited at relatively low Q, which makes it difficult to conduct detailed structural analysis of liquid and amorphous material. Here, we show the in situ high-pressure pair distribution function measurement of liquid and glass by using the 100 keV pink beam. Structures of liquids and glasses are measured under in situ high-pressure conditions in the Paris–Edinburgh press by high-energy x-ray diffraction measurement using a double-slit collimation setup with a point detector. The experiment enables us to measure S(Q) of GeO2 and SiO2 glasses and liquid Ge at a wide range of Q up to 20–29 Å−1 under in situ high-pressure and high-temperature conditions, which is almost two times larger than that of the conventional high-pressure angle-dispersive x-ray diffraction measurement. The high-pressure experimental S(Q) precisely determined at a wide range of Q opens the way to investigate detailed structural features of liquids and amorphous materials under in situ high-pressure and high-temperature conditions, as well as ambient pressure study.

DOI： 10.1063/5.0176975

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Development of high-speed X-ray imaging in multi-anvil press at the BL04B1 beamline in SPring-8 for falling sphere viscosity measurement on low viscous liquid at high pressure conditions 査読

Nozomi M. KONDO, Yoshio KONO, Steeve GRÉAUX, Yuji HIGO

Journal of Mineralogical and Petrological Sciences 119 ( 1 ) n/a - n/a 2024年

Strong effect of liquid Fe–S on elastic wave velocity of olivine aggregate: Implication for the low velocity anomaly at the base of the lunar mantle 査読

Yoshio Kono, Hideharu Kuwahara, Steeve Gréaux, Mark L. Rivers, Yanbin Wang, Yuji Higo, Keisuke Mitsu, Nozomi Kondo

Earth and Planetary Science Letters 618 118287 - 118287 2023年9月

Experimental evidence of tetrahedral symmetry breaking in SiO2 glass under pressure 査読

Yoshio Kono, Koji Ohara, Nozomi M. Kondo, Hiroki Yamada, Fumiya Noritake, Kiyofumi Nitta, Oki Sekizawa, Yuji Higo, Yoshinori Tange, Hirokatsu Yumoto, Takahisa Koyama, Hiroshi Yamazaki, Yasunori Senba, Haruhiko Ohashi, Shunji Goto, Ichiro Inoue, Yujiro Hayashi, Kenji Tamasaku, Taito Osaka, Jumpei Yamada, Makina Yabashi

Nature Communications 13 ( 1 ) 2022年4月

Low Velocity Zones in the Martian Upper Mantle Highlighted by Sound Velocity Measurements 査読

F. Xu, N. C. Siersch, S. Gréaux, A. Rivoldini, H. Kuwahara, N. Kondo, N. Wehr, N. Menguy, Y. Kono, Y. Higo, A.-C. Plesa, J. Badro, D. Antonangeli

Geophysical Research Letters 48 ( 19 ) 2021年9月

Continuous measurement of ultrasonic elastic wave velocities, X-ray radiography and X-ray diffraction of Zr50Cu40Al10 metallic glass at high pressure and high temperature conditions 査読

Yoshio Kono, Yuji Higo, Steeve Gréaux, Yuki Shibazaki, Rui Yamada, Hideharu Kuwahara, Nozomi Kondo

High Pressure Research 41 ( 3 ) 219 - 232 2021年1月

Interaction between Cerium and H2O in Hydrous Rhyolitic Melts 査読

Nozomi M. Kondo, Yoshio Kono, Koji Ohara, Ryoichi Nakada, Toshiaki Ina, Etienne Skrzypek, Akihiro Yamada, Satoshi Saito

ACS Earth and Space Chemistry 4 ( 12 ) 2281 - 2288 2020年12月

初期地球内部における物質分化：同位体地球科学と高圧融解実験からの制約査読

小木曽哲, 近藤望

高圧力の科学と技術 27 ( 4 ) 256 - 265 2018年2月

冥王代の沈み込み帯で形成された地殻の主成分元素組成：コマチアイトの高圧含水融解実験からの制約

近藤望, 小木曽哲

日本地球化学会年会要旨集 64 243 - 243 2017年

記述言語：日本語出版者・発行元：一般社団法人日本地球化学会

<p>冥王代(>4.0 Ga)にマントルと地殻がどのように分化していたか、そして地殻がどのような組成であったかを知ることは、地殻の抽出とリサイクルによるマントル化学組成進化の初めの様相を理解する上で必要不可欠である。我々は、先行研究の高マントルポテンシャル温度におけるマントル対流モデル(Foley et al. 2014)を参考に冥王代の火成活動様式を推定し、冥王代に形成される地殻の主成分元素組成を高圧融解実験によって決定した。結論として、冥王代にはまず未分化マントルカンラン岩の融解からFeとTi、アルカリ元素に富んだコマチアイト質地殻が形成された。そして沈み込みに伴うこのコマチアイト質地殻の含水融解によって、Tiとアルカリ元素に富んだ玄武岩質－ピクライト質地殻が形成されていたと考えられる。</p>

DOI： 10.14862/geochemproc.64.0_243

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Major element composition of an Early Enriched Reservoir: constraints from Nd-142/Nd-144 isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite 査読

Nozomi Kondo, Takashi Yoshino, Kyoko N. Matsukage, Tetsu Kogiso

PROGRESS IN EARTH AND PLANETARY SCIENCE 3 2016年8月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

The Accessible Silicate Earth (ASE) has a higher Nd-142/Nd-144 ratio than most chondrites. Thus, if the Earth is assumed to have formed from these chondrites, a complement low-Nd-142/Nd-144 reservoir is needed. Such a low-Nd-142/Nd-144 reservoir is believed to have been derived from a melt in the early Earth and is called the Early Enriched Reservoir (EER). Although the major element composition of the EER is crucial for estimating its chemical and physical properties (e.g., density) and is also essential for understanding the origin and fate of the EER, which are both major factors that determine the present composition of the Earth, it has not yet been robustly established. In order to determine the major element composition of the EER, we estimated the age and pressure-temperature conditions to form the EER that would best explain its Nd isotopic characteristics, based on Sm-Nd partitioning and its dependence on pressure, temperature, and melting phase relations. Our estimate indicates that the EER formed within 33.5 Myr of Solar System formation and at near-solidus temperatures and shallow upper-mantle pressures. We then performed high-pressure melting experiments on primitive peridotite to determine the major element composition of the EER at estimated temperature at 7 GPa and calculated the density of the EER. The result of our experiments indicates that the near-solidus melt is iron-rich komatiite. The estimated density of the near-solidus melt is lower than that of the primitive peridotite, suggesting that the EER melt would have ascended in the mantle to form an early crust. Given that high mantle potential temperatures are assumed to have existed in the Hadean, it follows that the EER melt was generated at high pressure and, therefore, its composition would have been picritic to komatiitic. As the formation age of the EER estimated in our study precedes the last giant, lunar-forming impact, the picritic to komatiitic crust (EER) would most likely have been ejected from the Earth by the last giant impact or preceding impacts. Thus, the EER has been lost, leaving the Earth more depleted than its original composition.

DOI： 10.1186/s40645-016-0099-0

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7GPaにおけるザクロ石カンラン岩ソリダスメルト組成と失われた貯蔵庫の主成分元素組成

近藤望, 芳野極, 松影香子, 吉田健太, 小木曽哲

日本地球化学会年会要旨集 61 154 - 154 2014年

記述言語：日本語出版者・発行元：日本地球化学会

現在の地球のケイ酸塩部分とコンドライトの間には¹⁴²Nd/¹⁴⁴Ndに有意な差があり、この差を補償する、液相濃集元素に富んだ貯蔵庫の存在が示唆されている。Kondo & Kogiso (2014)から、この貯蔵庫は7GPaでのカンラン岩ソリダスメルトである可能性が高い。本研究はこのソリダスメルト組成をModified Iterative Sandwich Experiment (Hirschmann & Dasgupta, 2007) を用いて決定した。メルト組成はWalter (1998)から外挿した組成とほぼ整合的なコマチアイト質となった。しかしKとPは予想よりも低濃度となり、この貯蔵庫がKREEP質な組成とならない可能性が示唆された。

DOI： 10.14862/geochemproc.61.0_154

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