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首页> 外文期刊>Geosciences >Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland
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Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland

机译：西格陵兰南部Mesoarchaean Ulamertoq橄榄岩体中铬铁矿的结构和化学特征对比

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摘要

Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites.
机译：橄榄石以类透镜体的形式出现在南部格陵兰岛Akia地层的Mesoarchaean原始片麻岩中。 Ulamertoq橄榄岩体是区域正斜片岩中最大的橄榄岩体。它主要由橄榄石，邻二甲苯和富含闪石的超镁铁质岩石组成，这些岩石具有变质的组织和化学特征。乌拉默托克地区不同地方的铬铁矿层表现出鲜明的特征。在一个地区中，邻苯二甲-闪石橄榄石中含有亚铬铁矿。亚铬酸盐中的组成区带明显，从芯部到边缘的Cr和Fe含量降低，而Al和Mg升高。来自另一个地方的均质亚铬酸盐相当均匀且富含铁。主相和副相的矿物化学显示出变质特征。推断的温度条件表明分区的亚铬铁矿，均质亚铬铁矿及其主体在不同的变质条件下达到平衡。在本文中，探索了从积云到亚固相阶段的各种机制，以了解两种对比类型的亚铬铁矿的起源。

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