Shock metamorphism of ordinary chondrites from Grove Mountains, Antarctica

Lu, Feng and Yangting, Lin and Sen, Hu and Tao, Liu (2009) Shock metamorphism of ordinary chondrites from Grove Mountains, Antarctica. Advances in Polar Science, 20 (2). pp. 187-199.

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Abstract

Shock effects of 93 Grove Mountains (GRV) ordinary chondrites were studied in this work, including fracture, various types of extinction, and recrystallization of silicates observed under optical microscopy. Shock-induced veins and pockets show various micro textures, decomposition and phase transformation of minerals. The confirmed high-pressure polymorphs of silicates are ringwoodite, majorite, pyroxene glass and maskelynite. Based on the shock effects and assemblages of high-pressure minerals, shock stages of all of 93 GRV chondrites were classified. In comparison with literature, the Grove Mountains meteorites have a higher fraction (23 out of 93) of heavily shocked samples (S4-S5). Most o f the heavily shocked meteorites are L group (22 out of 23), except for one H chondrite. The distinct shock metamorphism between H and L groups may indicate different surface properties of their parent bodies. In addition, there is relationship between petrologic types and shock stages, with most heavily shocked samples observed in equilibrated ordinary chondrites (especially Type 5 and 6).

Item Type:	Article
Related URLs:
Keywords:	Antarctic, Grove Mountains, chondrites, shock metamorphism, high-pressure mineral
Subjects:	Natural Environment > Space
Organizations:	Unspecified
Date Deposited:	08 Sep 2023 13:07
URI:	http://library.arcticportal.org/id/eprint/2383

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