Sm-Nd isotopic systematics of lherzolitic shergottite Yamato-793605
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概要
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We have undertaken Sm-Nd isotopic studies on Yamato-793605 lherzolitic shergottite. The Sm-Nd internal isochron obtained for acid leachates and residues of whole-rock and separated mineral fractions yields an age of 185±16Ma with an initial εNd value of +9.7±0.2. The obtained Sm-Nd age is, within analytical errors, identical to the Rb-Sr age of this meteorite as well as to the previous Rb-Sr and Sm-Nd ages of Allan Hills-77005 and Lewis Cliff 88516, although the ε_(Nd) values are not identical to each other. Elemental abundances of lithophile trace elements remain nearly unaffected by aqueous alteration on the Martian surface. The isotopic systems of lherzolitic shergottites, thus, are considered to be indigenous, although disturbances by shock metamorphism are clearly observed. "Young ages of 〜180Ma" have been consistently obtained from this and previous Rb-Sr, Sm-Nd and U-Pb isotopic studies and appear to represent crystallization events.
- 国立極地研究所の論文
著者
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YAMASHITA KATSUYUKI
Department of Earth and Planetary Sciences, Kobe University
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Premo Wayne
Us Geological Survey
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Misawa Keiji
Antarctic Meteorite Research Center, National Institute of Polar Research
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Nakamura N
Graduate School Of Science And Technology Kobe University
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Yamashita Katsuyuki
Department Of Earth And Planetary Sciences Faculty Of Science Kobe University
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Nakamura Noboru
Graduate School Of Science And Technology Kobe University
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Yamada Kazuhiro
Graduate School of Science and Technology, Kobe University
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Morikawa Noritoshi
Graduate School of Science and Technology, Kobe University
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Nakamura N
Kobe Univ. Kobe
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Misawa K
Antarctic Meteorite Research Center National Institute Of Polar Research
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Misawa Keiji
Antarctic Meteorite Research Center National Institute Of Polar Research
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Morikawa N
Graduate School Of Science And Technology Kobe University
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Misawa Keiji
Antarctic Meteorite Center National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-
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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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Yamada Kazuhiro
Graduate School Of Science And Technology Kobe University
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Misawa K
National Inst. Polar Res. Tokyo
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