摘要
新疆西天山与斑岩铜矿有关的北达巴特岩体,是一次岩浆侵入作用的产物,可划分为3个岩相:中心相、过渡相及边缘相.中心相为二长花岗斑岩,过渡相为流纹质碎斑熔岩,边缘相为流纹质熔结角砾岩和熔结凝灰岩.北达巴特岩体的岩石稀土配分模式呈不对称“V”字型曲线,表明它经历了一定的岩浆分异演化.但其过渡相和边缘相的岩石稀土配分模式因受岩浆同化混染作用,与中心相相比存在显著的差异.其铜、钼、银、钨、锡、铋、锑、砷含量相对较高.在北达巴特岩体蚀变较弱的岩石表现为相对富钠质,即Na2O>K2O;但蚀变较强的岩石却表现为相对富钾质,即K2O>Na2O.
Beidabate body, the porphyry-type copper deposit in West Tianshan Mountain of Xinjiang, is formed by a magma intrusion. It consists of three lithofacies： center lithoface, transition lithoface and edge lithoface. The center lithoface is a plagio-feldspathic granite-porphyry, the transition lithoface is a rhyolitic cataclastic speckled lava, and the edge lithoface is a rhyolitic melt cementation breccia and melt cementation tuff. The REE distribution patterns of the Beidabate body center lithoface are asymmetric V-type curves, indicating the definite magma differential evolution. Because of magma contamination, there are remarkable differences compared with the center lithoface in the REE distribution patterns of the transition lithoface and edge lithoface. The contents of Cu, Co, Ag, W, Sn, Bi, Sb are comparatively high. The weak Alteration rock shows comparatively rich in Na, namely Na2O〉 K2O; but the strong Alteration rock comparatively richer in K, namely K2O〉 Na2O.
出处
《桂林工学院学报》
北大核心
2006年第4期449-455,共7页
Journal of Guilin University of Technology
基金
国家科技攻关项目"新疆优势矿床资源勘查评价研究"(2003BA612A-06-04-01)
新疆维吾尔自治区矿产资源补偿费地质勘查项目(2004016)
广西培养新世纪学术和技术带头人专项资金项目(2002204)
关键词
斑岩铜矿床
地质地球化学特征
北达巴特岩体
温泉县
新疆
porphyry copper deposit
geologic-geochemistry characteristics
Beidabate body
Wcnquan County
Xinjiang
