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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: constraints on shock conditions and parent body size
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Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: constraints on shock conditions and parent body size

机译：L6球粒陨石大和791384中高压矿物的形成：对冲击条件和母体尺寸的限制

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摘要

We have studied the high-pressure phases observed in Yamato 791384 L6 chondrite. Host meteorite mainly consists of olivine, pyroxenes and plagioclase glass. Mineral fragments observed in the veins and the vein margin region of the host meteorite were partially or totally transformed into high-pressure phases; ringwoodite, majorite, akimotoite, NaAlSi3O8 hollandite and jadeite. Matrix of the shock vein contains majorite-pyrope solid solution. The spatial distribution indicates that high-pressure phases are present in the shock veins and host rocks adjacent to the shock veins. Investigation of the high-pressure phases revealed that, in Y791384, fragments and adjacent matrix were subjected to pressures around of 18-23 GPa and the vein experienced temperatures around 2300 degreesC during the shock event. Ringwoodite lamellae were observed in the host olivine adjacent to the vein. Kinetic investigation for ringwoodite lamellar growth in olivine indicates that the shocked meteorite experienced the pressure for at least 4 s. Such long duration of the pressure pulse indicates that the size of the parent body was greater than 10 km. (C) 2004 Elsevier B.V. All rights reserved.
机译：我们研究了在Yamato 791384 L6球粒陨石中观察到的高压相。寄主陨石主要由橄榄石，辉石和斜长石玻璃组成。在主体陨石的静脉和静脉边缘区域中观察到的矿物碎片已部分或全部转变为高压相;林木，菱铁矿，明矾，NaAlSi3O8铁矿和硬玉。冲击脉的基体含有多数粒-固溶体固溶体。空间分布表明，在冲击脉和与冲击脉相邻的主岩中存在高压相。对高压相的研究表明，在Y791384中，碎片和相邻基质在大约18-23 GPa的压力下承受压力，并且在冲击事件中静脉经历的温度约为2300摄氏度。在与静脉相邻的宿主橄榄石中观察到林伍德薄片。橄榄石中林木层状生长的动力学研究表明，震惊的陨石经历了至少4 s的压力。如此长的压力脉冲持续时间表明，母体的大小大于10 km。 （C）2004 Elsevier B.V.保留所有权利。

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