南极GRV 022888和GRV 052408橄辉无球粒陨石的岩石矿物学特征及成因探讨

发布时间：2018-06-15 14:05

  本文选题：南极陨石 + 橄辉无球粒陨石　； 参考：《极地研究》2014年03期

【摘要】：主要介绍GRV 022888和GRV 052408两块南极陨石的岩相学和矿物化学特征,并在此基础上探讨其成因。GRV 052408陨石主要由橄榄石(~60 vol%)和辉石(~35 vol%)组成,含少量富碳质填隙物(~5 vol%);而GRV022888陨石基本由橄榄石(~98 vol%)构成,仅有很少量辉石,富碳质不透明填隙物含量也较低(~2 vol%)。这两块陨石中的橄榄石都可以见到明显的核部富铁边部富镁的反环带结构。结合岩相学和矿物化学特征,将它们划分为单矿Ⅰ型橄辉无球粒陨石。根据橄榄石-易变辉石-熔体温度计,计算得到两块陨石的形成温度在1 220℃左右。我们的研究结果支持橄辉无球粒陨石为球粒陨石质母体部分熔融后的残余物成因假说。
[Abstract]:The petrographic and mineralogical characteristics of two Antarctic meteorites, GRV 022888 and GRV 052408, are introduced in this paper. On the basis of this, the origin of the meteorite, GRV 052408, is mainly composed of olivine (60 volk) and pyroxene (35 volt). It contains a small amount of carbon-rich interstitial matter, while GRV022888 meteorite is basically composed of olivine, with only a small amount of pyroxene, and the content of carbon-rich opaque interstitial material is also relatively low. The olivine of the two meteorites can be seen in the core iron-rich edge magnesium-rich anti-ring structure. Combined with the characteristics of petrography and mineralogy, they are divided into single ore type I olivine free chondrites. Based on olivine, pyroxene and melt thermometer, the formation temperature of two meteorites was calculated to be about 1 220 鈩，

本文编号：2022282