东天山早二叠世幔源岩浆活动及镁铁质杂岩体铜镍成矿潜力分析

新疆东天山地区广泛发育早二叠世造山带岩浆铜镍硫化物矿床。东天山地区二叠纪幔源岩浆活动强烈,跨构造单元产出一套早二叠世火山岩、镁铁-超镁铁质杂岩体、镁铁质杂岩体和辉长-辉绿岩体。这套幔源岩浆为钙碱性岩浆,具有连续演化特征,具有喷出相和通道相地质特征。小型镁铁质-超美铁质杂岩体是目前东天山发现的主要的铜镍矿成矿岩体,部分镁铁质杂岩体作为岩浆通道,结晶分异好、含矿性好和剥蚀程度相对较低具有巨大找矿潜力。

Early Permian mantle derived magma and the Cu-Ni mineralization potentiality of the mafic complex in eastern Tianshan, Xinjiang

The eastern Tianshan is one of important area that widely spread early Permian orogenic magmatic Cu-Ni sulfide deposits in China. The early Permian mantle derived magmatic rocks, including volcanic rocks, mafic-ultramfic complex, mafic complex and gabbro. extensively distributed in all the tectonic belts of eastern Tianshan. These rocks are characterized mantle derived calc-alkaline series magma, the different types rocks evolution from the fractionation of the mantle derived parental magma, the ejection phase are the volcanic rocks and the channel phase are different mafic and/or ultramafic complex and gabbro. To date, almost all the Cu-Ni sulfide deposits formed in the mafic-ultramafic complex, a part of mafic complexes, as the magmatic channel phase, are characterized by good crystallization-fractionation and mineralization, low level erosion, have great prospecting potentiality.