新疆阿克塔斯金矿床黑云母花岗岩锆石U-Pb和绢云母^(39)Ar/^(40)Ar测年及地质意义  

Zircon U-Pb age of biotite granite and ^(39)Ar/^(40)Ar age of sericite from Aketasi gold deposit in Xinjiang,and their geological significance

作　　者：卫晓锋[1] 潘东[2] 阴元军 廖震 吕晓强[2] 单立华[2] 丁汝福[2] WEI XiaoFeng;PAN Dong;YIN YuanJun;LIAO Zhen;LV XiaoQiang;SHAN LiHua;DING RuFu(Beijing Institute of Geology for Mineral Resources,Beijing 100012, China;China Non-ferrous Metals Resource GeologicalSurvey, Beijing 100012, China;Sinotech Minerals Exploration Co., Ltd., Beijing 100012, China)

机构地区：[1]北京矿产地质研究院,北京100012 [2]有色金属矿产地质调查中心,北京100012 [3]中色地科矿产勘查股份有限公司,北京100012

出　　处：《矿床地质》2019年第2期251-260,共10页Mineral Deposits

基　　金：十二五国家科技支撑计划项目(编号:2011BA06B00);新疆地勘基金项目(编号:AL16-2-LQ08)联合资助

摘　　要：阿克塔斯金矿床位于新疆阿尔泰造山带南缘,矿体赋存于黑云母花岗岩与中泥盆统北塔山组中性火山岩接触带,矿石类型主要为石英脉型和蚀变岩型。矿区中酸性侵入岩体的岩石类型为二长花岗岩、黑云母花岗岩。近矿的黑云母花岗岩LA-ICP-MS锆石U-Pb年龄为(329.5±1.8)Ma,成岩时代为早石炭世;主成矿期的金-黄铁矿-石英细脉中的绢云母^(40)Ar/^(39)Ar坪年龄为(247.7±1.3) Ma、等时线年龄为(245.1±1.4)Ma,成矿时代为早三叠世。研究表明,阿克塔斯金矿成岩与成矿时代相距80 Ma,为碰撞造山和后碰撞造山不同地质作用的产物。该矿床具有造山型金矿的特点,额尔齐斯断裂带的右形剪切走滑作用控制金矿成矿过程。The Aketasi gold deposit is located on the southern margin of the Altay orogenic belt. Gold orebodies are mainly hosted in the contact zone between the biotite granite and the middle Devonian Beitashan Formation volcanic rock. The main ore types are quartz vein type and altered rock type. The lithology of the Aketasi rocks is mainly composed of monzonitic granite and biotite granite. The age of U-Pb dating of zircon from the biotite granite is(329.5±1.8)Ma, demonstrating that the petrogenetic age is early Carboniferous. The 39Ar/40Ar age of sericite which is coexistent with that of gold, pyrite and quartz veinlets at the main metallogenic stage shows the plateau age of(247.7±1.3)Ma, and isochronal age of(245.1±1.4)Ma, implying that the metallogenic age is Early Triassic. Studies show that the difference between petrogenesis age and mineralization age of the Aktas gold deposit is 80 Ma, suggesting products of different geological processes of collision orogeny and post-collision orogeny. The deposit has the characteristics of orogenic gold deposit and the ore-forming process was controlled by the right-shaped shear strike-slip of the Irtysh fault zone.

关 键 词：地球化学 锆石U-Pb测年 绢云母40Ar-39Ar测年 阿克塔斯金矿 阿尔泰造山带 

分 类 号：P618.51[天文地球—矿床学]