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首页> 外文期刊>Contributions to Mineralogy and Petrology >The origin of coarse garnet peridotites in cratonic lithosphere: new data on xenoliths from the Udachnaya kimberlite, central Siberia
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The origin of coarse garnet peridotites in cratonic lithosphere: new data on xenoliths from the Udachnaya kimberlite, central Siberia

机译:克拉通岩石圈粗石榴石橄榄岩的起源:西伯利亚中部Udachnaya kimberlite的异岩的新数据

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摘要

We report new textural and chemical data for 10 garnet peridotite xenoliths from the Udachnaya kimberlite and examine them together with recent data on another 21 xenoliths from the 80-220 km depth range. The samples are very fresh (LOI near zero), modally homogeneous and large (>100 g). Some coarse-grained peridotites show incipient stages of deformation with <10 % neoblasts at grain boundaries of coarse olivine. Such microstructures can only be recognized in very fresh rocks, because finegrained interstitial olivine is strongly affected by alteration, and may have been overlooked in previous studies of altered peridotite xenoliths in the Siberian and other era-tons. Some of the garnet peridotites are similar in composition to low-opx Udachnaya spinel harzburgites (previously interpreted as pristine melt extraction residues), but the majority show post-melting enrichments in Fe and Ti.
机译:我们报告了来自Udachnaya金伯利岩的10个石榴石橄榄岩异种岩的新结构和化学数据,并将它们与80-220 km深度范围内另外21种异岩的最新数据一起进行了研究。样品非常新鲜(LOI接近零),中等均质且较大(> 100 g)。一些粗粒橄榄岩显示出初期的变形阶段,在粗橄榄石的晶界处有<10%的成新细胞。这样的微观结构只能在非常新鲜的岩石中识别出来,因为细粒间质橄榄石受蚀变的强烈影响,并且在先前对西伯利亚和其他时代成岩的橄榄岩异岩的蚀变研究中可能已经忽略了。一些石榴石橄榄岩的成分与低opx的Udachnaya尖晶石harzburgites(以前被解释为原始熔体提取残留物)相似,但大多数都显示出熔融后Fe和Ti的富集。

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