Hydrogen isotope geochemistry of lherzolitic shergottite in Martian meteorite GRV99027 from the Grove Mountains in Antarctica  

作　　者：WANG Henian HSU Weibiao GUAN Yunbin LIANG Ying 

机构地区：[1]State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China [2]Laboratory for Astrochemistry and Planetary Sciences, Purple Mountain Observatory, Nanjing 210008, China [3]Department of Geological Sciences, Arizona State University, Tempe, Arizona 85287, USA

出　　处：《Chinese Science Bulletin》2006年第16期2001-2005,共5页

基　　金：This work was supported by the National Natural Science Foundation of China （Grand No. 40232026）;State Key Laboratory for Mineral Deposits Research of Nanjing University and National Polar Research Institute;State 0ceanic Administration of the People＇s Republic of China.

摘　　要：Hydrogen isotopic composition was measured using an ion microprobe for lherzolitic shergottite in Martian meteorite GRV 99027 from the Grove Mountains in Antarctica. The D/H ratios of phosphate whitlockites were analyzed and water concentrations of tested points were calculated. The result show that their δ D values vary from +1300‰ to +4700‰, and water contents from 0.04 wt% to 0.43 wt%. Comparing the results with the hydrogen isotopic compositions of whole rock, hydrous miner- als and phosphates in SNC meteorites indicates that water highly enriched in deuterium is a unique feature of Martian meteorites, especially the phosphates prominent. It is interpreted as the result of isotopic exchange between magmatic water and Martian crustal fluids. The high D/H ratios observed in GRV 99027 phosphates indicate that they have hydrogen isotopic compositions similar to those of apatite in other Martian meteorites. The results further con- firmed the association of GRV 99027 with the Martian meteorite group.Hydrogen isotopic composition was measured using an ion microprobe for Iherzolitic shergottite in Martian meteorite GRV 99027 from the Grove Mountains in Antarctica. The D/H ratios of phosphate whitlockites were analyzed and water concentrations of tested points were calculated. The result show that their δD values vary from ＋1300‰ to ＋4700‰, and water contents from 0.04 wt% to 0.43 wt%. Comparing the results with the hydrogen isotopic compositions of whole rock, hydrous minerals and phosphates in SNC meteorites indicates that water highly enriched in deuterium is a unique feature of Martian meteorites, especially the phosphates prominent. It is interpreted as the result of isotopic exchange between magmatic water and Martian crustal fluids. The high D/H ratios observed in GRV 99027 phosphates indicate that they have hydrogen isotopic compositions similar to those of apatite in other Martian meteorites. The results further confirmed the association of GRV 99027 with the Martian meteorite group.

关 键 词：南极洲 火星 陨星 辉熔长石 氢同位素 离子显微探针 

分 类 号：P595[天文地球—地球化学]