摘要
川西龙门山地区元古宙变质火山碎屑岩系中发育一系列块状黄铁矿型铜矿床,含矿围岩形成于岛弧构造环境。矿石中黄铁矿占金属矿物总质量分数的90%左右,黄铜矿质量分数为0.8%~3.0%,闪锌矿为1%~4%。矿石主要元素为Fe、S、Zn、Cu、Mn等,其次为Ag、Au、Pb、Se、Cd、Ga、Ti、V、Co等元素,全区各矿层矿石中δ(34S)分布范围为-1.5‰^+15.9‰,平均为+7.6‰,N(32S)/N(34S)值为22,据此推断成矿物质应来自地壳深部,与洋壳俯冲作用有关。主要金属硫化物及其微量元素和硫同位素组成特征表明矿床类型为火山成因块状硫化物矿床,即VMS矿床。
A series of blocklike pyritic copper deposits are developed in the epimetamorphic athrogenic rock in Longmen Mountain of Chuanxi area（western Sichuan）,where ore-bearing rocks are formed in island arc tectonic environment. The pyrite amounts to nearly 90% of whole metallic minerals, with the content of chalcopyrite varing from 0.8% to 3% and sphalerite from 1%-4%. The main elements of mineral are Fe, S,Z, Cu, and Mn, and sub-elements are Ag, Au, Pb, Se, Cd, Ga, Ti, V, Co, etc. The ratio of δ（^34S） spreading each layer ranges from -1.5‰ to ＋15.9‰ with the average occupation ＋7.6‰ and the ratio of ^32S/^34S 22. It can be concluded from the finding above that the elements are mainly sourced the deep earth＇s crust, about the subduction area of the oceanic crust. The main metallic sulphide and its trace elements and sulfur isotope formation character show that the mineral belongs to massive sulfide deposit formed by volcano the VSM.
出处
《地质科技情报》
CAS
CSCD
北大核心
2009年第4期59-64,共6页
Geological Science and Technology Information
基金
四川冶金地质勘查局项目“彭州式铜矿床资源潜力评价”(20070747)
关键词
VMS铜矿床
硫同位素
微量元素
VSM copper deposit, sulfur isotope, trace element
