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首页> 外文期刊>Contributions to Mineralogy and Petrology >Morphology and microstructure of chromite crystals in chromitites from the Merensky Reef (Bushveld Complex, South Africa)
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Morphology and microstructure of chromite crystals in chromitites from the Merensky Reef (Bushveld Complex, South Africa)

机译：梅伦斯基礁（南非布什维尔德综合体）中铬铁矿中铬铁矿晶体的形态和微观结构

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摘要

The Merensky Reef of the Bushveld Complex consists of two chromitite layers separated by coarsegrained melanorite. Microstructural analysis of the chromitite layers using electron backscatter diffraction analysis (EBSD), high-resolution X-ray microtomography and crystal size distribution analyses distinguished two populations of chromite crystals: fine-grained idiomorphic and large silicate inclusion-bearing crystals. The lower chromitite layer contains both populations, whereas the upper contains only fine idiomorphic grains. Most of the inclusion-bearing chromites have characteristic amoeboidal shapes that have been previously explained as products of sintering of pre-existing smaller idiomorphic crystals. Two possible mechanisms have been proposed for sintering of chromite crystals: (1) amalgamation of a cluster of grains with the same original crystallographic orientation; and (2) sintering of randomly orientated crystals followed by annealing into a single grain.
机译：布什维尔德综合体的梅伦斯基礁由两块铬铁矿层组成，两层铬铁矿层由粗粒黑铁矿隔开。使用电子背散射衍射分析（EBSD），高分辨率X射线显微断层照相术和晶体尺寸分布分析对铬铁矿层进行显微结构分析，可区分出两种铬铁矿晶体：细粒状的亚晶型和大的含硅酸盐夹杂物的晶体。下部的铬铁矿层包含这两个种群，而上部的仅包含细小的亚型晶粒。大多数带有夹杂物的亚铬酸盐具有特征性的变形虫形状，这些形状以前已被解释为烧结先前存在的较小的独特晶体的产物。对于铬铁矿晶体的烧结，提出了两种可能的机理：（1）合并具有相同原始晶体学取向的一簇晶粒; （2）烧结随机取向的晶体，然后退火成单个晶粒。

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