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Weathering, shock metamorphism and type distribution patterns of 98 ordinary chondrites from the Grove Mountains, Antarctica

【标题】Weathering, shock metamorphism and type distribution patterns of 98 ordinary chondrites from the Grove Mountains, Antarctica

【Title】Weathering, shock metamorphism and type distribution patterns of 98 ordinary chondrites from the Grove Mountains, Antarctica

【作者】 戴德求; 王道德; 缪秉魁

【Author】 Dai Deqiu ; Wang Daode ; Miao Bingkui

【期刊】极地研究

【Journal】

【期刊年份】2009

【卷】20

【期】2

【关键词】 ordinary chondrites; weathering; shock metamorphism; type distribution patterns; Antarctica

【Keywords】 ordinary chondrites; weathering; shock metamorphism; type distribution patterns; Antarctica

【摘要】Petrography and mineral chemistry of ninety-eight ordinary chondrites from Grove Mountains (GRV), Antarctica, were presented and their. Weathering effect, shock metamorphism and type distribution patterns were discussed in this study. Among them, six are unequilibrated ordinary chondrites, including 3 H3 and 3 L3; and 92 meteorites are equilibrated ordinary chondrites, including 24H-group (13H4, 10H5, 1H6), 64 L-group ( 2 L4, 44 L5, 18 L6) and 4 LL-group ( 3 LL4, 1 LL5). Most GRV chondrites ( > 90% ) displayed minor weathering effect (W 1 and W 2). About half of the meteorites experienced severe shockmetamorphism. They commonly contain shock-induced melt veins and pockets. These heavily shocked meteorites provide us with natural samples for study of high-pressure polymorphs of minerals. In addition, the Grove Mountains collection seems to have more abundant unequilibrated and L group ordinary chondrites compared to the US Antarctic meteorite collection which were mainly found along the Transan tarctic Mountains.

【Abstract】Petrography and mineral chemistry of ninety-eight ordinary chondrites from Grove Mountains (GRV), Antarctica, were presented and their. Weathering effect, shock metamorphism and type distribution patterns were discussed in this study. Among them, six are unequilibrated ordinary chondrites, including 3 H3 and 3 L3; and 92 meteorites are equilibrated ordinary chondrites, including 24H-group (13H4, 10H5, 1H6), 64 L-group ( 2 L4, 44 L5, 18 L6) and 4 LL-group ( 3 LL4, 1 LL5). Most GRV chondrites ( > 90% ) displayed minor weathering effect (W 1 and W 2). About half of the meteorites experienced severe shockmetamorphism. They commonly contain shock-induced melt veins and pockets. These heavily shocked meteorites provide us with natural samples for study of high-pressure polymorphs of minerals. In addition, the Grove Mountains collection seems to have more abundant unequilibrated and L group ordinary chondrites compared to the US Antarctic meteorite collection which were mainly found along the Transan tarctic Mountains.

【基金/项目】 E50806

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