Search Results - "Sawaki, Yusuke"

Abiotic Methane Generation via CO2 Hydrogenation With Natural Chromitite Under Hydrothermal Conditions by Hisahiro Ueda, Yohei Matsui, Yusuke Sawaki

“…Abstract In modern continental serpentinization systems and ultramafic rock‐hosted sub‐seafloor hydrothermal systems, it is believed that chromitite plays an…”
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Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa by Fujisaki, Wataru, Fukami, Yusuke, Matsui, Yohei, Sato, Tomoki, Sawaki, Yusuke, Suzuki, Katsuhiko

“…We determined redox-sensitive element concentrations along with δ15NTN values from the Triassic-Jurassic shales interbedded within deep-sea cherts at the…”
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Global perturbations of carbon cycle during the Triassic–Jurassic transition recorded in the mid-Panthalassa by Fujisaki, Wataru, Matsui, Yohei, Asanuma, Hisashi, Sawaki, Yusuke, Suzuki, Katsuhiko, Maruyama, Shigenori

“…•Rhaetian to Hettangian shales interbedded in chert in the Katsuyama, SW Japan.•δ13Corg and major, trace, and rare earth elements data obtained from the…”
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Chemical Nature of Hydrothermal Fluids Generated by Serpentinization and Carbonation of Komatiite: Implications for H2‐Rich Hydrothermal System and Ocean Chemistry in the Early Earth by Hisahiro Ueda, Takazo Shibuya, Yusuke Sawaki, Katsumi Shozugawa, Akiko Makabe, Ken Takai

“…Abstract H2‐rich ultramafic‐hosted hydrothermal systems are considered to be important places for the origin and early evolution of life. In this study, we…”
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The Cambrian Explosion: Plume-driven birth of the second ecosystem on Earth by Santosh, M., Maruyama, S., Sawaki, Yusuke, Meert, Joseph G.

“…The birth of modern life on Earth can be linked to the adequate supply of nutrients into the oceans. In this paper, we evaluate the relative supply of…”
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Trace‐element composition of zircon in Kofu and Tanzawa granitoids, Japan: Quantitative indicator of sediment incorporated in parent magma by Sawaki, Yusuke, Asanuma, Hisashi, Sakata, Shuhei, Abe, Mariko, Ohno, Takeshi

“…Zircon is one of the most important minerals in geochronologic research. Isotopic ratios and trace elements in zircons are expected to reflect those of their…”
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Hf-O isotope systematics of zircons from the Taitao granitoids: Implications for slab-melting material by Suzuki, Kazue, Sawaki, Yusuke, Iizuka, Tsuyoshi, Kitajima, Kouki, Hattori, Kentaro, Hirata, Takafumi, Anma, Ryo

“…Slab-melting is considered to have played an important role in the formation of continental crust. The combination of oxygen (O) and hafnium (Hf) isotope…”
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Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys by Fujisaki, Wataru, Sawaki, Yusuke, Matsui, Yohei, Yamamoto, Shinji, Isozaki, Yukio, Maruyama, Shigenori

“…To constrain the redox conditions and related nitrogen cycles during the Middle Permian (Guadalupian) to latest Late Permian (Lopingian) deep mid-Panthalassa,…”
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Precambrian basement, provenance implication, and tectonic evolution of the Gargan block of the Tuva-Mongolia terranes, Central Asian Orogenic Belt by Bold, Uyanga, Isozaki, Yukio, Aoki, Shogo, Sakata, Shuhei, Ishikawa, Akira, Sawaki, Yusuke, Sawada, Hikaru

“…Although the Phanerozoic geology of the Central Asian Orogenic Belt is extensively studied, there is still much to reveal about the initiation and early stages…”
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The Late Jurassic magmatic protoliths of the Mikabu greenstones in SW Japan: A fragment of an oceanic plateau in the Paleo-Pacific Ocean by Sawada, Hikaru, Isozaki, Yukio, Aoki, Shogo, Sakata, Shuhei, Sawaki, Yusuke, Hasegawa, Ryo, Nakamura, Yasuo

“…[Display omitted] •The Mikabu greenstones in SW Japan are fragments of accreted oceanic plateau.•Zircon U-Pb ages from the Mikabu greenstones show an igneous…”
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Geology of the Eoarchean, > 3.95 Ga, Nulliak supracrustal rocks in the Saglek Block, northern Labrador, Canada: The oldest geological evidence for plate tectonics by Komiya, Tsuyoshi, Yamamoto, Shinji, Aoki, Shogo, Sawaki, Yusuke, Ishikawa, Akira, Tashiro, Takayuki, Koshida, Keiko, Shimojo, Masanori, Aoki, Kazumasa, Collerson, Kenneth D.

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The origin of methane in serpentinite-hosted hyperalkaline hot spring at Hakuba Happo, Japan: Radiocarbon, methane isotopologue and noble gas isotope approaches by Suda, Konomi, Aze, Takahiro, Miyairi, Yosuke, Yokoyama, Yusuke, Matsui, Yohei, Ueda, Hisahiro, Saito, Takuya, Sato, Tomohiko, Sawaki, Yusuke, Nakai, Ryosuke, Tamaki, Hideyuki, Takahashi, Hiroshi A., Morikawa, Noritoshi, Ono, Shuhei

“…Methane (CH4) associated with marine and terrestrial sites of serpentinization has been proposed to be abiotic in origin. However, the source of carbon and the…”
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The Ediacaran radiogenic Sr isotope excursion in the Doushantuo Formation in the Three Gorges area, South China by Sawaki, Yusuke, Ohno, Takeshi, Tahata, Miyuki, Komiya, Tsuyoshi, Hirata, Takafumi, Maruyama, Shigenori, Windley, Brian F., Han, Jian, Shu, Degan, Li, Yong

“…The Ediacaran period was one of the most important times for the evolution of life. However, the scarcity of well-preserved outcrops of Ediacaran rocks still…”
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New geochronological constraints on the middle Archean Shurugwi greenstone belt toward an understanding of the crustal evolution of the Zimbabwe Craton by Sawada, Hikaru, Sawaki, Yusuke, Sakata, Shuhei, Ishikawa, Akira, Muteta, Brian, Isozaki, Yukio, Maruyama, Shigenori

“…The Shurugwi greenstone belt (SGB) in the central Zimbabwe Craton is one of the major volcano-sedimentary belts in the craton, but its formation age and…”
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Tonian-Cryogenian boundary sections of Argyll, Scotland by Fairchild, Ian J., Spencer, Anthony M., Ali, Dilshad O., Anderson, Ross P., Anderton, Roger, Boomer, Ian, Dove, Dayton, Evans, Jonathan D., Hambrey, Michael J., Howe, John, Sawaki, Yusuke, Shields, Graham A., Skelton, Alasdair, Tucker, Maurice E., Wang, Zhengrong, Zhou, Ying

“…•Robust Sr- and C-isotope stratigraphy despite greenschist facies metamorphism.•Islay carbonates have molar tooth structure and low positive δ13C.•Cryogenian…”
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New chronological constraints for Cryogenian to Cambrian rocks in the Three Gorges, Weng'an and Chengjiang areas, South China by Okada, Yoshihiro, Sawaki, Yusuke, Komiya, Tsuyoshi, Hirata, Takafumi, Takahata, Naoto, Sano, Yuji, Han, Jian, Maruyama, Shigenori

“…The Neoproterozoic and Cambrian were two of the most dramatic periods in the history of the Earth, because large multi-cellular animals first appeared then in…”
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An integrated chemostratigraphic (δ13C-δ18O-87Sr/86Sr-δ15N) study of the Doushantuo Formation in western Hubei Province, South China by Lan, Zhongwu, Sano, Yuji, Yahagi, Takuya, Tanaka, Kentaro, Shirai, Kotaro, Papineau, Dominic, Sawaki, Yusuke, Ohno, Takeshi, Abe, Mariko, Yang, Hongwei, Liu, Hai, Jiang, Tao, Wang, Teng

“…•Chemostratigraphic (δ13C-δ18O-87Sr/86Sr-δ15N) data were obtained from the Doushantuo Formation.•Two episodes of negative δ13Ccar excursions (EN1 and EN3) were…”
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Nitrogen isotope chemostratigraphy of the Ediacaran and Early Cambrian platform sequence at Three Gorges, South China by Kikumoto, Ryohei, Tahata, Miyuki, Nishizawa, Manabu, Sawaki, Yusuke, Maruyama, Shigenori, Shu, Degan, Han, Jian, Komiya, Tsuyoshi, Takai, Ken, Ueno, Yuichiro

“…The appearance of multicellular animals and subsequent radiation during the Ediacaran/Cambrian transition may have significantly changed the oceanic ecosystem…”
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Carbon and oxygen isotope chemostratigraphies of the Yangtze platform, South China: Decoding temperature and environmental changes through the Ediacaran by Tahata, Miyuki, Ueno, Yuichiro, Ishikawa, Tomoko, Sawaki, Yusuke, Murakami, Kazuki, Han, Jian, Shu, Degan, Li, Yong, Guo, Junfeng, Yoshida, Naohiro, Komiya, Tsuyoshi

“…Multicellular animals first appeared on the earth during the Ediacaran period. However, the relationship between the abrupt biological evolution and…”
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Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes by Fujisaki, Wataru, Sawaki, Yusuke, Yamamoto, Shinji, Sato, Tomohiko, Nishizawa, Manabu, Windley, Brian F., Maruyama, Shigenori

“…In order to clarify the redox history of the central Panthalassic Ocean in the Middle Triassic (Anisian) to Early Jurassic (Toarcian), we determined the…”
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