Type distribution pattern and pairing of ordinary chondrites from Grove Mountains,Antarctica

作     者：MIAOBingkui LINYangting ZHOUXinhua 

作者机构：InstituteofGeologyandGeophysicsChineseAcademyofSciencesBeijing100029China GuangzhouInstituteofGeochemistryChineseAcademyofSciencesGuangzhou510640China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2003年第48卷第9期

页      面：908-913页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 070901[理学-矿物学、岩石学、矿床学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by tbe Ministry of Science and Technology of China(Grant No.2001DIA50040-09) 

主　　题：球粒状陨石 南极 Grove山脉 成对陨石 岩相学 岩石记述学 分散模型 

摘      要：Twenty-eight meteorites were collected on blue ice in the Grove Mountains region, Antarctica, by the 16th Chinese Antarctic Research Expedition (CHINARE). 26 out of the stones are ordinary chondrites, and their chemical-petrographic types are assigned based on electron probe microanalyses, petrography and mineralogy. 6 of them are unequilibrated L-chondrites, and the other 20 chondrites are equilibrated, including 6 H-group (3 H4, 1 H5 and 2 H6), 9 L-group (3 L4, 1 L5 and 5 L6) and 5 LL-group (2 LL4 and 3 LL5). Detailed comparative study suggests that 10 of them (including other 2 chondrites collected by the 15th CHINARE) could be paired, and represent 5 individual fall events. Hence, all 32 meteorites collected from the Grove Mountains probably belong to 27 fall events, suggestive of meteorite transferring and concentrating processes. The Grove Mountains are likely a new meteorite-enriched region. Distribution patterns of chemical-petrographic type and mass of the Grove Mountains meteorites are significantly distinct from those found in other regions, indicative of their unique sources and/or concentration mechanism. However, more studies are required in order to clarify these differences.