T
Takayuki Ushikubo
Researcher at Japan Agency for Marine-Earth Science and Technology
Publications - 144
Citations - 5571
Takayuki Ushikubo is an academic researcher from Japan Agency for Marine-Earth Science and Technology. The author has contributed to research in topics: Chondrite & Chondrule. The author has an hindex of 41, co-authored 133 publications receiving 4797 citations. Previous affiliations of Takayuki Ushikubo include NASA Astrobiology Institute & Tohoku University.
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High precision SIMS oxygen isotope analysis and the effect of sample topography
TL;DR: In this paper, the IMS-1280 has been used for stable isotope geochemistry applications, and the results show that it can achieve spot-to-spot reproducibility of 0.3 and 2.3 µm.
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Hadean age for a post-magma-ocean zircon confirmed by atom-probe tomography
John W. Valley,Aaron J. Cavosie,Aaron J. Cavosie,Takayuki Ushikubo,David A. Reinhard,D. Lawrence,David J. Larson,Peter H. Clifton,Thomas F. Kelly,Simon A. Wilde,Desmond E. Moser,Michael J. Spicuzza +11 more
TL;DR: Isolatednanoclusters, measuring about 10nm and spaced 10−50nm apart, are enriched in incompatible elements including radiogenic Pb with unusually high 207 Pb/ 206 Pbratios as discussed by the authors.
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Chondrulelike Objects in Short-Period Comet 81P/Wild 2
Tomoki Nakamura,Takaaki Noguchi,Akira Tsuchiyama,Takayuki Ushikubo,Noriko T. Kita,John W. Valley,Michael E. Zolensky,Yuki Kakazu,Kanako Sakamoto,Etsuko Mashio,Kentaro Uesugi,Tsukasa Nakano +11 more
TL;DR: Four crystalline particles from comet 81P/Wild 2 that were apparently formed by flash-melting at a high temperature and are texturally, mineralogically, and compositionally similar to chondrules are found.
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Primordial oxygen isotope reservoirs of the solar nebula recorded in chondrules in Acfer 094 carbonaceous chondrite
TL;DR: In this paper, an ion microprobe analysis of oxygen three-isotope ratios in chondrules from the Acfer 094, one of the most primitive carbonaceous chondrites, was performed.
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26Al-26Mg isotope systematics of the first solids in the early solar system
Noriko T. Kita,Qing-Zhu Yin,Glenn J. MacPherson,Takayuki Ushikubo,Benjamin Jacobsen,Kazuhide Nagashima,Erika Kurahashi,Alexander N. Krot,Stein B. Jacobsen +8 more
TL;DR: In this paper, high-precision bulk aluminum-magnesium isotope measurements of calcium-aluminum-rich inclusions (CAIs) from CV carbonaceous chondrites in several laboratories define a bulk 26Al-26Mg isochron with an inferred initial 26Al/27Al ratio of approximately 5.25×10−5, named the canonical ratio.