新疆和静县乔霍特铜矿床成矿流体地球化学特征  

Geochemistry of Ore-forming Fluids in the Qiaohuote Copper Deposit of Hejing County, Xinjiang

作　　者：王志良[1] 毛景文[1] 杨建民[1] 韩春明[2] 张作衡[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质大学,北京100083

出　　处：《地球学报》2004年第5期549-554,共6页Acta Geoscientica Sinica

基　　金：国土资源地质调查项目 (编号 :2 0 0 3 10 2 0 0 0 0 1 3和DKD2 0 0 10 2 7 2 );国家重点基础研究项目 (编号 :G19990 43 2 16)资助。

摘　　要：乔霍特铜矿床位于伊犁中天山板块和塔里木板块碰撞对接带北侧的早古生代岛弧带。赋矿地层为上志留统巴音布鲁克组安山质火山岩 ,控矿构造为近EW向的脆性断裂。本文对该矿床流体包裹体的均一温度、盐度、稀土元素和氢氧同位素进行了测试。研究结果表明 ,乔霍特铜矿床的成矿温度为 2 0 1～ 32 2℃ ,盐度w(NaCl) eq为 9.34%～ 17.2 6 % ;成矿流体主要来自海西晚期钾长花岗岩浆在结晶成岩过程中释放出来的岩浆水 ,成矿金属物质主要来自安山质火山岩。Located in the Late Palaeozoic island arc belt north of the collisional suture between Yili-Middle Tianshan plate and Tarim plate, the Qiaohuote copper deposit is hosted in andesitic volcanic rocks of the Upper Silurian Bayinbuluke Formation. Its orebodies are wholely controlled by approximately EW-trendingbrittle fractures. In this paper, homogenization temperatures, salinities, rareearth elements and H,O isotopes of fluid inclusions in the Qiaohuote copper deposit were determined. The ore-forming temperatures range from 201 ℃ to 322 ℃,and the salinities of ore-forming fluids vary from 9.34% to 17.26%. The H,O isotopic data and REE composition of fluid inclusions indicate that the ore-formingfluids mainly came from magmatic water, and the metals were mainly derived fromandesitic volcanic rocks. The Qiaohuote copper deposit is of the hydrothermal type.

关 键 词：铜矿 成矿流体 地球化学 板块碰撞 早古生代 赋矿地层 

分 类 号：TD862.1[矿业工程—金属矿开采]