Zobrazeno 1 - 10
of 254
pro vyhledávání: '"Jun‐Ichi Kimura"'
Autor:
Tatsuo Nozaki, Kosuke T. Goto, Yutaro Takaya, Kazuhiko Shimada, Akira Owada, Gen Shimoda, Jun-Ichi Kimura, Qing Chang, Tetsuji Onoue, Shiki Machida, Teruaki Ishii, Kenji Shimizu, Naoto Hirano, Kazuhide Mimura, Moei Yano, Junichiro Ohta, Yasuhiro Kato
Publikováno v:
Journal of Asian Earth Sciences: X, Vol 11, Iss , Pp 100176- (2024)
The area offshore of Minamitorishima Island, Northwestern Pacific Ocean, contains large amounts of seafloor mineral resources such as ferromanganese (Fe–Mn) nodules, Fe–Mn crusts, and rare-earth element and yttrium (REY)-rich muds. In this study,
Externí odkaz:
https://doaj.org/article/18712854c178422fb34b250827d902cb
Autor:
Yuki Tomimatsu, Tatsuo Nozaki, Tetsuji Onoue, Hironao Matsumoto, Honami Sato, Yutaro Takaya, Jun-Ichi Kimura, Qing Chang, Manuel Rigo
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)
Abstract The Carnian Pluvial Episode (CPE) was a short interval of extreme rainfall in the Late Triassic that caused significant changes in marine ecosystems. Global warming induced by Wrangellia volcanism is thought to have resulted in oceanic anoxi
Externí odkaz:
https://doaj.org/article/b917d3ac07394c47b3e3372523418e78
Autor:
Ayumu Nishihara, Yoshiyuki Tatsumi, Katsuya Kaneko, Jun-Ichi Kimura, Qing Chang, Nobuo Geshi, Takashi Miyazaki, Bogdan Stefanov Vaglarov, Hironobu Hinata, Keiko Suzuki-Kamata
Publikováno v:
Frontiers in Earth Science, Vol 11 (2024)
Understanding the origin, assembly, and evolution of voluminous magma that erupts in catastrophic caldera-forming eruptions (CCFEs) is a community imperative. A CCFE of the Aira caldera at 30 ka discharged over 350 km3 of magma, which can be grouped
Externí odkaz:
https://doaj.org/article/fd064c696a07468fb985a8ee51fd8b51
Autor:
Yusuke Kuwahara, Kazutaka Yasukawa, Koichiro Fujinaga, Tatsuo Nozaki, Junichiro Ohta, Honami Sato, Jun-Ichi Kimura, Kentaro Nakamura, Yusuke Yokoyama, Yasuhiro Kato
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
Abstract The solid earth plays a major role in controlling Earth’s surface climate. Volcanic degassing of carbon dioxide (CO2) and silicate chemical weathering are known to regulate the evolution of climate on a geologic timescale (> 106 yr), but t
Externí odkaz:
https://doaj.org/article/e354a32434f541078ffc226263197e01
Autor:
Takeshi Hanyu, Kenji Shimizu, Takayuki Ushikubo, Jun-Ichi Kimura, Qing Chang, Morihisa Hamada, Motoo Ito, Hikaru Iwamori, Tsuyoshi Ishikawa
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019)
Volatile exchange between the Earth’s interior and surface layers is one of the central issues in mantle geochemistry. Here the authors present evidence that chlorine is transferred from the surface to the deep mantle by subducted oceanic crust, fo
Externí odkaz:
https://doaj.org/article/29a62bc6ad3c407c98cb9e0336f92c65
Autor:
Tatsuo Nozaki, Takashi Nikaido, Tetsuji Onoue, Yutaro Takaya, Keiko Sato, Jun-Ichi Kimura, Qing Chang, Daisuke Yamashita, Honami Sato, Katsuhiko Suzuki, Yasuhiro Kato, Atsushi Matsuoka
Publikováno v:
Journal of Asian Earth Sciences: X, Vol 1, Iss , Pp - (2019)
Pelagic cherts preserved in accretionary complexes represent former seafloor sediment that can retain geochemical evidence of paleoceanographic conditions that predate the oldest extant oceanic crust. The ratio of Os isotopes in seawater, in particul
Externí odkaz:
https://doaj.org/article/bf458e0cc1a94de7952fd9db51aa070b
Autor:
Mariko Nagashima, Teruyoshi Imaoka, Takashi Kano, Jun-ichi Kimura, Qing Chang, Takashi Matsumoto
Publikováno v:
European Journal of Mineralogy. 34:425-438
Ferro-ferri-holmquistite (IMA2022-020), ideal formula □Li2(Fe32+Fe23+)Si8O22(OH)2, was found in albitized granite from the Iwagi islet, Ehime, Japan. Ferro-ferri-holmquistite is a CFe2+Fe3+ analogue of holmquistite and belongs to the lithium-subgro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a1691df0402b078906c7a6ab1e0dfa3
https://doi.org/10.5194/ejm-34-425-2022
https://doi.org/10.5194/ejm-34-425-2022
Publikováno v:
Geology. 50:1111-1115
Oomurodashi is a newly discovered active, shallow, silicic submarine volcano only 60 km from Tokyo Bay. We reveal its past eruptive activity, and potential future hazards, by examining volatile contents of its subaerial and submarine pumice and lava
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f127ee1ca9a81e421eb9c3f73c30b438
https://doi.org/10.1130/g50148.1
https://doi.org/10.1130/g50148.1
Autor:
Keishiro Azami, Naoto Hirano, Jun-Ichi Kimura, Qing Chang, Hirochika Sumino, Shiki Machida, Kazutaka Yasukawa, Yasuhiro Kato
Publikováno v:
Minerals; Volume 12; Issue 8; Pages: 943
In this study, the Sr isotope ratios (IRs; 87Sr/86Sr) of ferromanganese (Fe–Mn) crusts are analyzed through laser ablation inductively coupled plasma multiple-collector mass spectrometry. A sample collected from off Minamitorishima Island showed un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5c762fd276b06e868b7cbc3c2875dfd
Publikováno v:
Economic Geology.
Better understanding metallogenesis in oceanic crust depends on costly sea-floor drilling projects in areas where metal-bearing deposits, such as sea-floor massive sulfide deposits, are currently forming. In 2018, International Ocean Discovery Progra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f8acf4a9096d09bcdc4468085fd663a
https://doi.org/10.5382/econgeo.4960
https://doi.org/10.5382/econgeo.4960