新疆哈密土屋铜矿床地质和地球化学特征  

Geological and geochemical characteristics of the Tuwu porphyry copper deposits in Hami,Xinjiang

作　　者：韩春明[1] 肖文交[1] 潘成泽 李月臣 颜启明 曲军峰[1] 敖松坚[1] 张继恩[1] 郭谦谦[1] 马冲[3] 万博[1] 

机构地区：[1]中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京100029 [2]新疆305项日办公室,乌鲁木齐830000 [3]中国科学院研究生院,北京100049

出　　处：《地质科学》2010年第2期537-550,共14页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：新疆国家“十一五”国家科技支撑计划重点项目(编号:2007BAB25B04,2007BAB07B03-01-01);国家重点基础研究发展规划项目(编号:2007CB411307)共同资助

摘　　要：土屋铜矿床是我国近年来发现的特大型斑岩铜矿床,其独特矿床地质背景和矿床规模已经引起国内外地质学界和矿业界的广泛关注;本文详细叙述该矿床的地质背景,对矿床的地质、地球化学特征进行系统研究和总结,对矿床的成矿作用动力学过程进行探讨。研究表明,该矿床成矿物质具有深部来源特征,而岩浆在侵位过程中受到上地壳物质一定程度的混染;成矿流体以岩浆水为主,天水和岩浆水的混合仅为少量;石英流体包裹体均一温度较低,但盐度较高;含矿斑岩体是多次脉动式侵位的,成岩时代主要集中于早石炭世(367～358 Ma);成矿时代为晚于成岩时代(347.3±2.1 Ma～322.7±3 Ma)。Located in the northern margin of the Zhungaer-Kazakesitan plate which this plate was collided with Trim plate,the Tuwu porphyry copper deposit is one of the important deposit in the well-known east Tianshan copper-concentrated region. Copper and copper mineralizations occur within the Late Devonian volcanic sequences of the Qi＇eshan group. Sulfur isotopic analysis results reveal that sulfur of the ore fluids was mainly derived from deep sources,and the oxygen results reveal that magma was mainly derived from a mixed source of igneous rocks and upper crust rocks,it imply that the magma came from upper mantle,but was mixed with a small amount of crust material. Re-Os and Ar-Ar isotope dating show that copper deposit have two group ages,early Carboniferious（347.3±2.1 Ma）and middle Carboniferious（322.7±3 Ma）,Single-grain zircon U-Pb dating results suggest that granite-porphyry emplacement at least two times（358～301 Ma）,make-up the Devonian-Carboniferous Qi＇eshan group of the island arc magmatic belt on the palaeogeographically margin between the Tarim plate and Zhungaer-Kazakesitan plate.

关 键 词：斑岩铜矿床 成矿流体 土屋 新疆 

分 类 号：P611[天文地球—矿床学]