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首页> 外文期刊>Contributions to Mineralogy and Petrology >Metamorphic re-equilibration and metasomatism of highly chromian, garnet-rich peridotitic xenoliths from South African kimberlites
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Metamorphic re-equilibration and metasomatism of highly chromian, garnet-rich peridotitic xenoliths from South African kimberlites

机译：来自南非金伯利岩的高铬，富含石榴石的橄榄石异生岩的变质重新平衡和交代作用

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摘要

A history of decompression and metasomatism is preserved in a suite of highly chromian, garnet-rich peridotitic xenoliths from the diamondiferous Newlands and Bobbejaan kimberlites, South Africa. A high proportion of the garnets and chromites in these rocks plot in the diamond-facies fields on Cr_2O_3-CaO and Cr_2O_3-MgO wt% plots, and Cr-rich compositions are found in both the harzburgitic and lherzolitic fields. Petrographic evidence suggests that the earliest known mineralogies were those of olivine-bearing, garnet-rich rocks. These were modified by a decompression event that caused recrystallization of garnets and led to orientated spinel and pyroxene inclusions in garnet.
机译：减压和变质作用的历史保存在一组来自南非含钻石的纽兰兹和鲍贝贾恩金伯利岩的富含铬的，富含石榴石的橄榄石异岩中。 Cr_2O_3-CaO和Cr_2O_3-MgO wt％地块的钻石相田中，这些岩石中的石榴石和亚铬岩的比例很高，而在高成矿质和亮石质油田中都发现了富含Cr的成分。岩石学证据表明，已知最早的矿物学是含橄榄石，石榴石的岩石。这些被减压事件所修饰，减压事件导致石榴石重结晶，并导致石榴石中尖晶石和辉石夹杂物取向。

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