Geochemical characteristics of mafic-ultramafic rocks in the Cihai ore district, Xinjiang, and their geological significance
Geochemical characteristics of mafic-ultramafic rocks in the Cihai ore district, Xinjiang, and their geological significance
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发表时间：
2010
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通讯作者：
Wang Yu-wang
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作者：
Wang Yu-wang
磁海铁矿床位于塔里木克拉通北缘北山成矿带，是一处与镁铁质-超镁铁质岩有关的多成因矿床，经历了岩浆分异、岩浆注入和热液交代作用。钙碱性系列。稀土元素和微量元素模式与原生地幔相似，但在岩浆演化和侵位过程中部分受到大陆地壳的污染。结合前人的研究结果，认为该矿床形成于碰撞后阶段的拉张环境。岩浆分异和热液蚀变对磁海矿床的成矿作用发挥了重要作用。
Cihai iron deposit,located in the Beishan metallogenic belt,the northern margin of the Tarim craton,is a multiple genesis deposit related to the mafic-ultramafic rocks,which experenced magmatic differentiation,ore magma injection and hydrothermal metasomatism.Based on systematic research on the petrology and geochemistry of mafic-ultramafic rocks in the Cihai area,it is considered that the suit of mafic-ultramafic rocks belongs to calc-alkaline series.The REE and trace element patterns are similar to the primary mantle but are partly contaminated by continental crust during the magma evolution and emplacement.Considering previous results,it is suggested that the deposit formed in an extensional environment in post-collisional stage.Both the magmatic differentiation and hydrothermal alteration played important roles in mineralization of the Cihai deposit.