Výsledky vyhledávání - "TADAO NISHIYAMA"

Akademický článek

K-Ar geochronology for hydrothermal K-feldspar within plagioclase in a granitic pluton: constraints on timing and thermal condition for hydrothermal alteration

Autor: Takashi Yuguchi, Koshi Yagi, Eiji Sasao, Tadao Nishiyama

Publikováno v: Heliyon, Vol 7, Iss 4, Pp e06750- (2021)

This study presents the K-Ar geochronology for hydrothermal K-feldspar in plagioclase alteration, including methodology and application to the Toki granite, in central Japan. Borehole samples from the Toki granite were collected and mechanically and

Externí odkaz: https://doaj.org/article/1d52db8a61ac4087ae39fcb789d47760

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Morphological and chemical characterization of secondary carbonates in the Toki granite, central Japan, and the evolution of fluid chemistry

Autor: Takashi Yuguchi, Haruka Hatsukawa, Satoshi Suzuki, Takumi Imura, Satoko Motai, Kazuo Nakashima, Tadao Nishiyama

Publikováno v: American Mineralogist. 107:2282-2290

This study describes the: (1) morphological nature of the calcites in the Toki granite, central Japan; (2) the difference in chemical compositions in terms of morphological classification; and (3) the identification of the stages of calcite formation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::62efd16ec66f569b545916429ff955a4
https://doi.org/10.2138/am-2022-8229

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Using cathodoluminescence to identify oscillatory zoning of perthitic K-feldspar from the equigranular Toki granite

Autor: Takashi Yuguchi, Mai Nonaka, Satoshi Suzuki, Takumi Imura, Kazuo Nakashima, Tadao Nishiyama

Publikováno v: American Mineralogist. 107:1563-1574

For the first time, cathodoluminescence (CL) was used to show oscillatory zoning in perthitic K-feldspars from the equigranular Toki granite, central Japan. Based on the CL patterns, two types of zoning are identified: single core oscillatory zoning

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d72f039e9dd43103e454d7a6279bacd9
https://doi.org/10.2138/am-2022-8146

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Formation process of Al-rich calcium amphibole in quartz-bearing eclogites from The Sulu Belt, China

Autor: Masaki Enami, Tomoki Taguchi, Yui Kouketsu, Katsuyoshi Michibayashi, Tadao Nishiyama

Publikováno v: American Mineralogist. 107:1582-1597

Aluminum-rich and Si-poor calcium amphibole [~3.9 Al atoms per formula unit (apfu) and ~5.5 Si apfu for 23 O] occur in the quartz-bearing eclogites from the Donghai area, Sulu ultrahigh-pressure metamorphic belt, eastern China. Most of the aluminous

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::822c2d24fc18ea560868e8ded9768c06
https://doi.org/10.2138/am-2022-7996

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Micropores and mass transfer in the formation of myrmekites

Autor: Takashi Yuguchi, Haruka Yuasa, Yuya Izumino, Kazuo Nakashima, Eiji Sasao, Tadao Nishiyama

Publikováno v: American Mineralogist. 107:476-488

The formation process of myrmekites in granitic rocks can help us to understand the mass transfer between minerals and hydrothermal fluids during the deuteric stage. The Toki granite, central Japan, has three types of myrmekites. Type A myrmekite is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a57bd2d1677c966e1ecdcc398153779
https://doi.org/10.2138/am-2021-7956

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Mass transfer associated with chloritization in the hydrothermal alteration process of granitic pluton

Autor: Tadao Nishiyama, Yuya Izumino, Takanobu Matsuki, Eiji Sasao, Takashi Yuguchi

Publikováno v: American Mineralogist. 106:1128-1142

This study, along with our previous studies (Yuguchi et al. 2015, 2019a), reveals the hydrothermal alteration processes in a pluton, with a focus on the mass transfer between minerals and hydrothermal fluid. It also depicts the sequential variations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e117b8ad8b6cc7f76a8293fa9482d84b
https://doi.org/10.2138/am-2020-7353

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Microdiamond in a low-grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan

Autor: Kazuki Harada, Yousuke Moribe, Ukyo Nishi, Yasushi Mori, Miki Shigeno, Shoji Arai, Kouhei Unoki, Akira Yoshiasa, Kousuke Fukuba, Hiroaki Ohfuji, Masami Terauchi, Satoko Ishimaru, Tadao Nishiyama

Publikováno v: Scientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
Scientific Reports

Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cab5db3cab527897dc858ea32a5fc1d9
http://link.springer.com/article/10.1038/s41598-020-68599-7

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Effects of a strong gravitational field on Mn-trimers and magnetic properties of hexagonal YMnO3 single crystal

Autor: Shinji Ando, Makoto Tokuda, Shinya Hayami, Akira Yoshiasa, Weijian Ma, Tadao Nishiyama, Tsutomu Mashimo

Publikováno v: Journal of Physics and Chemistry of Solids. 129:172-179

Under strong gravitational fields, the unique uniaxially distorted crystalline state induces structural changes in compounds other than those caused by high pressure and high temperature. We subjected the hexagonal YMnO3 single crystal to a strong-gr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c9a596ae672b64933344c75509f18cb
https://doi.org/10.1016/j.jpcs.2018.12.023

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