Metamorphism in mesosiderites
Metamorphism in mesosiderites
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中菱铁矿的变质作用
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
C. Nehru
中科院分区：
文献类型：
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作者：
J. Delaney;M. Prinz;G. Harlow;C. Nehru
先前对中陨星的研究已经确定了这些陨石中的变质叠加。然而，这种叠印的影响和影响尚未得到详细探讨。本研究记录了几个重要的结构和化学特征的mesosidite。中菱铁矿的成分进行了检查，考虑到斜方辉石，橄榄石碎屑，中菱铁矿镁铁质碎屑，和金属。中菱铁矿的硅酸盐基质的特点进行了探讨，变质作用的结构和化学证据进行了讨论，注意到橄榄石碎屑，镁辉石碎屑上的过度生长，富铁辉石颗粒上的轮辋，斜长石的微晶，和碎屑的吸收冠。沿着讨论了镁橄榄石的氧化还原形成过程以及变质作用的原因和影响。研究发现，变质作用从根本上改变了中菱铁矿中硅酸盐部分的结构。
Previous studies of mesosiderites have identified a metamorphic overprint in these meteorites. However, the effects and implications of this overprint have not yet been explored in detail. The present study documents several important textural and chemical features of the mesosiderites. The components of mesosiderites are examined, taking into account orthopyroxenites, olivine in clasts, mesosiderite mafic clasts, and metal. The characteristics of the silicate matrix of the mesosiderites is explored, and textural and chemical evidence of metamorphism is discussed, giving attention to coronas on olivine clasts, overgrowths on Mg-pyroxene clasts, rims on iron rich pyroxene grains, poikiloblasts of plagioclase, and resorption of clasts. Aspects of redox formation of merrillite are considered along with the causes and the implications of metamorphism. It is found that metamorphism has radically changed the texture of the silicate fraction of the mesosiderites.