新疆扎河坝地区蛇绿岩带形成环境及其地质意义  

Xinjiang Zaheba Ophiolite Formation Area Environment and its Geological Significance

作　　者：秦雨[1] 

机构地区：[1]东华理工大学地球科学学院,南昌330013

出　　处：《能源研究与管理》2017年第1期15-21,共7页Energy Research and Management

摘　　要：扎河坝蛇绿岩是扎河坝—阿尔曼太蛇绿岩带的组成部分,变质作用普遍,其整体上呈北西向展布,蛇绿岩的产出受断裂控制,其内部断裂也较发育。扎河坝蛇绿岩产出特征具有有序结构及构造混杂的特点,构成蛇绿岩底部单元。扎河坝蛇绿岩属有序型蛇绿岩套。镁铁质岩为有限洋盆的橄榄拉斑玄武岩浆分离结晶后形成的,为形成与其有关的矿产提供了构造空间。而在加里东运动晚期,使其"准原地"褶皱就位,为成矿元素的进一步活化运移富集又提供了条件。绝大多数的超镁铁质岩强蛇纹石化,为形成蛇纹岩矿床创造了良好的地质条件。同时,该带的形成也反映了洋壳形成演化与陆壳增生之间存在着一种新的转化方式,这为研究地壳的生成及演变提供了重要的信息。Zhaheba area of ophiolite belong to Zaheba ophiolite belt a Arman is part of the whole northwest trending,metamorphism widespread, ophiolite output obviously controlled by faults, its internal fault is developed. The ophiolite is only distributed mainly in South West from the dam, ultramafic rocks, magnesium mafic rocks, siliceous rocks. Zaheba ophiolite occurrence has the characteristics of ordered structure and tectonic mélange, the ultramafic rocks are depleted mantle rocks, with cold emplacement intrusive, constitute ophiolite bottom unit in genesis and mafic magma formation. There is no direct relation between the zaheba ophiolite is composed of rocks and complete facilities, although the tectonic melange and disordered fragments stacked but the inside of each cell retains sequence characteristics better, should be ordered according to the combined characteristics of ophiolites, it can be divided into ophiolite melange formation. The era of belonging to the Ordovician Silurian. The mafic rocks formed as a limited basin of olive tholeiitic magma limited separation after crystallization, has the characteristics of low calcium magnesium rich aluminum iron components, in the early stage of differentiation of small ultramafic rocks, provides space for the structure formation related in minerals. The late Caledonian movement, ＂thein situ＂ fold of ore-forming elements in place for further activation of migration and enrichment but also provides the conditions. The ultramafic rocks most strongly serpentinized and create favorable geological conditions for the formation of serpentinite ore deposits. At the same time, the Zaheba ophiolite formation reflects oceanic crust the formation of a new mode of transformation between evolution and continental crust growth, provides new information for the formation and evolution of the crust.

关 键 词：蛇绿岩 大地构造 超镁铁质岩 蛇纹石化 新疆扎河坝 

分 类 号：P588.323[天文地球—岩石学]