地质学报（英文版）2004，Vol.78Issue(5)：1052-1059,8.
Classification of 24 New Ordinary Chondrites from the Grove Mountains, Antarctica
Classification of 24 New Ordinary Chondrites from the Grove Mountains, Antarctica
摘要
Abstract
Petrography and mineral chemistry of 24 ordinary chondrites from the Grove Mountains, Antarctica, have been studied in order to identify their chemical-petrographic types. These samples were selected from a total of 4448 Grove Mountains (GRV) meteorites collected during the 19th Chinese Antarctic Research Expedition so as to make an estimation of the large GRV meteorite collection. The chemical-petrographic types of these meteorites are presented below: 1 H3, 2 H4,4 H5, 2 H6, 1 L4, 7 L5, 5 L6, 1 LL4 and 1 LL6. The new data weaken the previous report that unequilibrated ordinary chondrites are unusually abundant in the Grove Mountains region. However, this work confirms significant differences in distribution patterns of chemical-petrographic types between the Grove Mountains and other regions in Antarctica. Many of these meteorites show significant terrestrial weathering, probably due to a high abundance ratio of meteorites found in moraines to those on blue ice. Nine meteorites experienced severe shock metamorphism, as evidenced by undulose extinction and intense fracturing of silicates and presence of shock-induced melt veins and pockets. These heavily shocked meteorites provided us with natural samples for the study of high-pressure polymorphs of minerals.关键词
Antarctica/meteorite/ordinary chondrite/classification/shock metamorphism/thermal metamorphismKey words
Antarctica/meteorite/ordinary chondrite/classification/shock metamorphism/thermal metamorphism引用本文复制引用
LU Ren,MIAO Bingkui,WANG Guiqing,DAI Deqiu,LIN Yangting,OUYANG Ziyuan,LI Chunlai..Classification of 24 New Ordinary Chondrites from the Grove Mountains, Antarctica[J].地质学报（英文版）,2004,78(5):1052-1059,8.基金项目
The authors are grateful to Prof. Wang Daode and Tao Kejie for their constructive discussion and comments. The samples were supplied by the Polar Research Institute of China. This work was supported by the pilot project of knowledge innovation program of （）
