新疆东准噶尔松喀尔苏铜金矿区蚀变绢云母^(40)Ar-^(39)Ar年龄及其地质意义  

^(40)Ar-^(39)Ar DATING OF SERICITE IN THE SONGKAERSU CU-AU DEPOSIT OF EASTERN JUNGGAR,XINJIANG

作　　者：张栋[1] 范俊杰[1] 刘鹏[1,2] 潘爱军[1] 王治华[1,2] 张玉杰[1] 赵军[3] 雷文大[3] 

机构地区：[1]武警黄金地质研究所,河北廊坊065000 [2]中国地质大学地球科学与资源学院,北京100083 [3]武警黄金第八支队,新疆乌鲁木齐830057

出　　处：《矿物岩石》2013年第4期61-67,共7页Mineralogy and Petrology

基　　金：中国地质调查局矿产资源评价项目(编号:1212011085018);黄金指挥部黄金专项业务费项目(编号:HJY10-04)

摘　　要：新疆东准噶尔松喀尔苏铜金矿区是卡拉麦里石炭纪陆相火山岩带新发现的斑岩型铜金矿床。为确定其成矿时代,对矿区与成矿有关的绢英岩化蚀变花岗斑岩中绢云母进行40 Ar-39 Ar测年研究,获得绢云母坪年龄和等时线年龄分别为338.6 Ma±2.2 Ma和341.5Ma±3.9Ma,坪年龄代表成矿年龄。测试结果表明,松喀尔苏铜金矿区成矿时代为早石炭世。该成矿年龄对于进一步认识矿床成因、地球动力学背景以及与准噶尔地区斑岩型矿床对比研究具有重要意义。The porphyry-type Songkaersu Cu-Au deposit occurred in Carboniferous continental volcanic belt of Karamaili and related to the continental volcanic-intrusive rocks. Mineralization mainly takes place in the contact zone of granite porphyry. In order to obtain the metallogenic time,the sericites separated from the phyllic zone of the altered granite porphyry was measure. The ^40Ar-^39Ar analysis of plateau age and isochron age yield （338.6±2.2） Ma and （341.5±3.9） Ma,respectively. The former represents the ore-forming age. It is suggested that the porphyry- type metallogenesis in the Songkaersu deposit took place in Early Carboniferous,which is consist- ent with the ages of the continental volcanic-intrusive rocks and the epithermal Au mineralization in the adjacent regions. It reveals that the Songkaersu porphyry Cu-Au deposit and the epithermal Au deposits were formed in the same magma-fluid mineralization system controlled by extrusion- extension conversion period in post collision environment.

关 键 词：绢云母 ^40AR-^39AR年龄 后碰撞 斑岩型铜金矿床 松喀尔苏 东准噶尔 

分 类 号：P597.3[天文地球—地球化学]