Výsledky vyhledávání - "Takashi YUGUCHI"

Akademický článek

Role of micropores within minerals in retardation of mass transfer by matrix diffusion and sorption in granitic rock

Autor: Takashi Yuguchi, Eiji Sasao, Ryoko Hibara, Hiroaki Murakami, Yusuke Ozaki

Publikováno v: Heliyon, Vol 10, Iss 17, Pp e37417- (2024)

Understanding the mass transfer characteristics of matrix diffusion and sorption is important in the safety assessment of geological disposal of high-level radioactive waste in crystalline rock (granite) by contributing to radionuclide retardation th

Externí odkaz: https://doaj.org/article/ab77fde3405c4a058c4d1ef7f53dd274

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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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Akademický článek

Genesis and development processes of fractures in granite: Petrographic indicators of hydrothermal alteration.

Autor: Takashi Yuguchi, Yuya Izumino, Eiji Sasao

Publikováno v: PLoS ONE, Vol 16, Iss 5, p e0251198 (2021)

Biotites occur with varying degrees of alteration within a granite. This study analyzes the relationships among alteration indicators, areal microvoid fractions in chloritized biotite, and macroscopic fracture frequencies in the Toki granite, central

Externí odkaz: https://doaj.org/article/ba058596542c4e51b49b31ef4f2425bb

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Akademický článek

Simultaneous determination of zircon U–Pb age and titanium concentration using LA-ICP-MS: Analysis data and crystallization temperature

Autor: Takashi Yuguchi, Kozue Ishibashi, Shuhei Sakata, Tatsunori Yokoyama, Daichi Itoh, Yasuhiro Ogita, Koshi Yagi, Takeshi Ohno

Publikováno v: Data in Brief, Vol 32, Iss , Pp 106092- (2020)

Simultaneous determination of zircon U–Pb age and titanium concentration for a single analysis spot gives both the crystallization age and temperature. In laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis, it is chall

Externí odkaz: https://doaj.org/article/7293c6824f484146913a44a925e8b54e

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Akademický článek

Analysis of the distribution of microfractures and micropores within granitic rock using simultaneous polarization–fluorescence microscopy

Autor: Takashi Yuguchi, Akane Usami, Masayuki Ishibashi

Publikováno v: Heliyon, Vol 6, Iss 8, Pp e04815- (2020)

The analysis of the distribution of microfractures and micropores is important to accurately characterise mass transfer within a rock body. In this paper, a new ‘simultaneous polarization–fluorescence microscopy’ method is presented, which can

Externí odkaz: https://doaj.org/article/e298a17c9c7445ef94b16ed54d5e8654

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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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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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