Cosmic-ray exposure age of Martian meteorite GRV 99027

被引：7
|
作者：
Kong Ping [1 ]
Fabel, D.
Brown, R.
Freeman, S.
机构：
[1] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
[3] Univ Glasgow, Dept Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland
[4] Scottish Univ Environm Res Ctr, E Kilbride G75 0QF, Lanark, Scotland
来源：
SCIENCE IN CHINA SERIES D-EARTH SCIENCES | 2007年 / 50卷 / 10期
关键词：
GRV; 99027; Martian meteorite; cosmic ray; exposure age; Mars;
D O I：
10.1007/s11430-007-0089-6
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We have determined the concentrations of Be-10 and Al-26 in GRV 99027 recovered by the 16th Chinese Antarctic expedition team, which are 14.1 +/- 0.6 dpm/kg and 67.5 +/- 3.4 dpm/kg, respectively. From the concentration of Be-10, we calculate a cosmic-ray exposure age of 4.4 +/- 0.6 Ma for GRV 99027. The concentration of Al-26 is too high compared to the Be-10 exposure age, indicating extra production from solar ray. The exposure ages, petrologic and geochemical characteristics of mantle-derived Martian meteorites GRV 99027, LEW 88516, Y-793605, NWA 1950 and ALHA77005 are very similar, suggesting that these meteorites most probably were ejected from Mars in the same impact event.
引用
收藏
页码：1521 / 1524
页数：4
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