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Yoichi Usui
Researcher at Japan Agency for Marine-Earth Science and Technology
Publications - 40
Citations - 960
Yoichi Usui is an academic researcher from Japan Agency for Marine-Earth Science and Technology. The author has contributed to research in topics: Plagioclase & Monsoon of South Asia. The author has an hindex of 14, co-authored 39 publications receiving 715 citations. Previous affiliations of Yoichi Usui include Tohoku University & University of Rochester.
Papers
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Journal ArticleDOI
Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago
John A. Tarduno,Rory D. Cottrell,Michael K. Watkeys,Axel Hofmann,Pavel V. Doubrovine,Pavel V. Doubrovine,Eric E. Mamajek,Dunji Liu,David G. Sibeck,Levi P. Neukirch,Yoichi Usui,Yoichi Usui +11 more
TL;DR: Analysis of ancient silicate crystals indicates that Earth’s magnetic field existed 3.40 to 3.45 billion years ago, pushing back the oldest record of geomagnetic field strength by 200 million years.
Journal ArticleDOI
The tremendous potential of deep-sea mud as a source of rare-earth elements
Yutaro Takaya,Kazutaka Yasukawa,Kazutaka Yasukawa,Takehiro Kawasaki,Koichiro Fujinaga,Koichiro Fujinaga,Junichiro Ohta,Junichiro Ohta,Junichiro Ohta,Yoichi Usui,Kentaro Nakamura,Jun-Ichi Kimura,Qing Chang,Morihisa Hamada,Gjergj Dodbiba,Tatsuo Nozaki,Koichi Iijima,Morisawa Tomohiro,Kuwahara Takuma,Ishida Yasuyuki,Takao Ichimura,Masaki Kitazume,Toyohisa Fujita,Yasuhiro Kato,Yasuhiro Kato,Yasuhiro Kato +25 more
TL;DR: The enormous resource amount and the effectiveness of the mineral processing are strong indicators that this new REY resource could be exploited in the near future.
Journal ArticleDOI
Discovery of extremely REY-rich mud in the western North Pacific Ocean
Koichi Iijima,Kazutaka Yasukawa,Kazutaka Yasukawa,Koichiro Fujinaga,Koichiro Fujinaga,Kentaro Nakamura,Shiki Machida,Yutaro Takaya,Junichiro Ohta,Satoru Haraguchi,Yoshiro Nishio,Yoichi Usui,Tatsuo Nozaki,Tatsuo Nozaki,Tatsuo Nozaki,Toshitsugu Yamazaki,Toshitsugu Yamazaki,Yuji Ichiyama,Akira Ijiri,Fumio Inagaki,Hideaki Machiyama,Katsuhiko Suzuki,Yasuhiro Kato,Yasuhiro Kato,Yasuhiro Kato +24 more
TL;DR: In this article, the geochemical society of Japan has proposed that rare-earth elements and yttrium are essential elements for products with advanced and green technologies, because of the magnetic and optical properties of REY that result from the characteristic configurations of electrons in these elements.
Journal ArticleDOI
Evidence for a 3.45-billion-year-old magnetic remanence: Hints of an ancient geodynamo from conglomerates of South Africa
TL;DR: In this paper, the authors used a conglomerate test to define two dominant components of magnetization in dacite parent body clasts and parent body rocks from the Barberton greenstone belt, South Africa.
Book ChapterDOI
Proceedings of the International Ocean Discovery Program
Steven C. Clemens,Wolfgang Kuhnt,Leah J. LeVay,Pallavi Anand,Takuto Ando,M. Bartol,Clara T Bolton,Xuan Ding,Karen Gariboldi,Liviu Giosan,E.C. Hathorne,Yongjian Huang,Priyank Jaiswal,Sunghan Kim,John B. Kirkpatrick,Kate Littler,Gianluca Marino,Philippe Martinez,D. K. Naik,A. Peketi,Stephen C. Phillips,Marci M. Robinson,Oscar E Romero,Netramani Sagar,Katie Taladay,Samuel Taylor,Kaustubh Thirumalai,Go-Ichiro Uramoto,Yoichi Usui,Jiasheng Wang,M. Yamamoto,Liping Zhou +31 more
TL;DR: The International Ocean Discovery Program (IODP) Expedition 353 (29 November 2014-29 January 2015) drilling six sites in the Bay of Bengal, recovering 4280 m of sediments during 32.9 days of on-site drilling as mentioned in this paper.