A preliminary report on noble gases in the Kobe (CK) meteorite: A carbonaceous chondrite fell in Kobe City, Japan
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概要
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We have investigated elemental and isotopic compositions of noble gases in the newly-fallen CK chondrite, Kobe. The relatively low concentrations of primordial heavy noble gases (Kr and Xe) and the relatively high ^<129>Xe/^<132>Xe ratio (6.51±0.02) are similar to those found in previous studies of CK chondrites. The calculated cosmic-ray exposure age based on cosmogenic ^<21>Ne is 41Ma, and the K-Ar age is 2.1Ga. Based on calculated exposure ages and gas retention ages of Kobe and some other CK chondrites, it is likely that they have partially lost both radiogenic and cosmogenic He by solar heating during the time of exposure. Based on the ^<40>Ar retention age, we interpret that Kobe may also have experienced thermal events, possibly related to impacts about 2 billion years age.
- 国立極地研究所の論文
著者
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NAKAMURA NOBORU
Department of Earth and Planetary Sciences, Kobe University
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MATSUMOTO TAKUYA
Department of Earth and Space Science, Graduate School of Science, Osaka University
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MATSUDA JUN-ICHI
Department of Earth and Space Science, Graduate School of Science, Osaka University
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Matsuda J
Osaka Univ. Toyonaka Jpn
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MATSUMOTO YOSHIKI
Department of Earth and Space Science, Graduate School of Science, Osaka University
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Matsumoto Takuya
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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Matsuda J
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Matsumoto Yoshiki
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Matsumoto Yoshiki
Department Of Anatomy And Neurobiology Faculty Of Medicine Kagawa University
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Matsuda Jun-ichi
Department Of Earth And Space Science Faculty Of Science Osaka University
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Matsumoto Takuya
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Nakamura Noboru
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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Nakamura Noboru
Department Of Earth & Planetary Sciences Kobe University
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Matsumoto Takuya
Department Of Chemical Engineering And Materials Science Doshisha University
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Nakamura Noboru
Department Of Earth & Planetary Sciences Faculty Of Science And Division Of The Nature Of The Ea
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Matsumoto Takuya
Department Of Bioregulatory Medicine Ehime University Graduate School Of Medicine
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Matsumoto Takuya
Department Of Biomaterials Okayama University Graduate School Of Medicine Dentistry And Pharmaceutical Sciences
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MATSUMOTO Takuya
Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University
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