东准噶尔黄羊山西金矿区含矿花岗斑岩锆石U-Pb定年及地质意义  

Zircon U-Pb Dating of Ore-Bearing Granite-Porphyry Vein in Western Huangyangshan Gold Deposit, Eastern Junggar and Its Geological Significance

作　　者：路彦明[1,2] 张玉杰[2] 潘懋[1] 刘翼飞[3] 徐斌[4,5] 朝银银[2] 张栋[2] 范俊杰[2] 陈晓吾[2] 潘爱军[2,4] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]武警黄金地质研究所,河北廊坊065000 [3]中国地质科学院矿产资源研究所,北京100037 [4]中国地质大学地球科学与资源学院,北京100083 [5]武警黄金一总队,哈尔滨150086

出　　处：《吉林大学学报（地球科学版）》2010年第4期852-858,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家科技支撑课题(2007BAB25B02);国土资源部地质大调查项目(1212010913028)

摘　　要：黄羊山西金矿位于东准噶尔卡拉麦里成矿带的中段,它由4条含金矿脉组成,矿化发生在富钾、偏碱性花岗斑岩中。为了限定成矿时代,采用LA-MC-ICP-MS U-Pb同位素定年法对含矿花岗斑岩中的锆石进行了系统的年代学测试;3件样品的锆石CL阴极图像和测试结果揭示花岗斑岩成岩时间为318.4～310.3Ma,年龄分别为(318.4±1.1)Ma(MSWD=1.3)、(310.3±2.6)Ma(MSWD=2.1)、(315.9±2.2)Ma(MSWD=2.1)。结合区域地壳演化特征,初步厘定卡拉麦里地区在晚古生代发生两期金成矿作用:早期与偏碱性岩浆活动有关,晚期与韧-脆性构造变形有关;二者均发生在晚古生代碰撞造山期后的伸展环境。The western Huangyangshan gold deposit, located in the middle of Karameili gold metallogenic belt, Eastern Junggar, is consisted of four gold ore bodies, all they are mineralized granite porphyry veins which are alkaline and K-rich. Three granite porphyry samples were collected, and CL characteristics of zircons from ore-bearing granite porphyry samples suggest their magmatic origin. LA-MC-ICP-MS U-Pb dating of zircons from the ore-bearing granite porphyry veins shows that their emplacing ages are （318.4 ± 1.1）-（310.3 ± 2.6）Ma. Regional comparison indicates that there occurred two epoch of gold mineralization in Karameili area , the earlier was related to the alkaline magmatic activity and latter was associaed with the ductile-brittle tectonic deformation. Both gold mineralization took place in post-collision orogenic collision environment.

关 键 词：锆石 LA-ICP-MS定年 花岗斑岩 黄羊山西金矿 卡拉麦里 

分 类 号：P618.51[天文地球—矿床学]