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宇宙尖晶石与地球尖晶石的比较 总被引:1,自引:0,他引:1
本文就宇宙尖晶石的形态,化学组成,及产状特征作了概要性论述,对它的成因机制 作了介绍;并和地球尖晶石作比较,表明它们之 间的成因和形成条件的差异,突出了宇宙尖晶石的特点,即宇宙尖晶石为陨石物质在大气氧化过程中结晶而成,无例外的都有一个较高的氧化态和高镍含量。在地质纪录中宇宙尖晶石的发现具有双重意义,它既是地外物质的标志,又反映了增生事件独特的形成环境。 相似文献
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Sphenoidal tensile microfractures with particular patterns have been discovered in the Late Devonian quartzose sandstone in islands and peninsula of the Taihu Lake area. Microfractures present a '人'-shape collective pattern, occurring in a single row or multiple rows. The quartz crystals in the inner acute angle area of some '人'-shape microfractures have severely been non-crystallized, showing the feature of diaplectic glass. The studies show that these special microfractures were formed during the unloading process after the compression was up to the peak of an impact event. 相似文献
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