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A Tiny Piece of Basalt Probably from Asteroid 4 Vesta

上传时间:2016-07-17 22:43

【发表年份】2004

【作  者】LIN Yangting” 2, WANG Daode2 and WANG Guiqing2

【提交单位】中科院地质与地球物理研究所

【摘  要】Grove Mountains (GRV) 99018 is a new eucrite (0.23 g), consisting mainly of pyroxene (50.5 ~01%)and plagioclase (37.2 ~01%w) ith minor silica minerals (7.0 ~01%a) nd opaque minerals (5.2 ~01%)I.t was intensely shocked,leading to partial melting, formation of abundant tiny inclusions in pyroxenes and plagioclase, and heavy brecciation.Exsolution of most pyroxenes (1-3 pn in width of the lamellae), recrystallization of the shock-induced melt pockets and veins (5-20 pn in size), and homogeneous compositions of pyroxenes of various occurrences suggest the intense thermal metamorphism of GRV 99018 in the asteroidal body Vesta. This new eucrite will bring additional constraints on the chemical composition and multi-stage thermal and shock history of Vesta.

【关键词 】meteorite, basalt, eucrite, asteroid, magmatism, shock metamorphism, thermal history

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