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新疆北山西段发育了一系列镁铁-超镁铁质岩体,部分岩体具有铜镍矿化,如坡一、坡东、红石山等岩体。铬铁矿作为较早结晶的矿物相,其化学成分对于对原始岩浆成分和演化的物理化学条件具有指示意义。尤其有些内部包裹体是包裹的熔体在封闭环境下结晶的产物。后续地质过程如含水蚀变作用、熔体-岩石反应、会造成矿物形态、成分的变化,受改造的铬铁矿对这些地质过程也是一种记录。铬铁矿主要以副矿物不均匀分布于纯橄岩及辉橄岩相内,含量一般<5%。根据产出状态和形态,
A series of mafic-ultramafic intrusions are developed in the western section of Beishan, Xinjiang. Some of the intrusions have copper-nickel mineralization, such as Pauchi, Pudong and Hongshishan. As the earlier crystallized mineral phase, chromite has a chemical composition that is indicative of the physico-chemical conditions of the original magmatic composition and evolution. In particular, some internal inclusions are the product of the encapsulated melt crystallizing in a closed environment. Subsequent geological processes such as water-induced alteration, melt-rock reactions can cause changes in mineral morphology and composition, and the altered chromite is also a record of these geological processes. Chromite is mainly distributed in the ancillary minerals in the dunite and mafic phase, the content is generally <5%. According to the output status and shape,