Rb-Sr isotopic systematics of lherzolitic shergottite Yamato-793605
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概要
- 論文の詳細を見る
We have undertaken a Rb-Sr isotopic study of the lherzolitic shergottite, Yamato (Y)-793605. The acid-leaching experiment designed to remove secondary Pb contamination during previous work with U-Th-Pb systematics did not significantly affect the Rb-Sr systematics. A Rb-Sr internal isochron obtained for combined data of leachates and residues yielded an age of 173±14Ma with an initial ^<87>Sr/^<86>Sr ratio of 0.71042±0.00007,using λ (^<87>Rb)=1.402×10^<-11>y^<-1>. The Rb-Sr age, initial ^<87>Sr/^<86>Sr ratio and trace element abundance pattern of Y-793605 are all similar to those of lherzolitic shergottites, ALH 77005 and LEW 88516. We favor the 173Ma age for the time of igneous crystallization, because this interpretation is more consistent with characteristics of both the isotopic systematics and mineral chemistry. A minor disturbance of U-Pb systems observed in residue fractions indicate that shock event(s) occurred more recently, without affecting Rb-Sr system.
- 国立極地研究所の論文
著者
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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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Nakamura Noboru
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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Morikawa Noritoshi
The Graduate School of Science and Technology, Kobe University
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Misawa Keiji
The Graduate School of Science and Technology, Kobe University
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Kondorosi Gabor
The Graduate School of Science and Technology, Kobe University
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Premo Wayne
U. S. Geological Survey
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Tatsumoto Mitsunobu
U. S. Geological Survey
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Nakamura Noboru
The 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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Morikawa N
Graduate School Of Science And Technology Kobe University
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Kondorosi Gabor
The Graduate School Of Science And Technology Kobe 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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Misawa K
National Inst. Polar Res. Tokyo
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