巴林左旗双尖子山银多金属矿床基本地质特征及成因机制  

The Geologic Features and Genesis of Shuangjianzishan Silver—Polymetallic Deposit,Balinzuo Qi,Inner Mongolia

作　　者：王丰翔[1,2] 孙红军 裴荣富[1] 刘翼飞[1] 刘春花[1] 江思宏[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(武汉),武汉430074 [3]赤峰天通地质勘查有限公司,内蒙古赤峰024000

出　　处：《地质论评》2016年第5期1241-1256,共16页Geological Review

基　　金：973项目(编号:2013CB429805);国家自然科学基金资助重点项目(编号:41030421)的成果~~

摘　　要：巴林左旗双尖子山银（铅、锌）矿床位于大兴安岭南段,为超大型热液脉型矿床,在时空分布上与中生代构造—岩浆岩关系密切。双尖子山银多金属矿化多呈席状、细脉浸染状、网脉—脉状在下二叠统大石寨组火山—沉积岩产出,并且构成似层状、（长）扁豆状、透镜状和囊状矿体。初步研究表明：与银多金属共生的绢云母和辉钼矿同位素年龄分别为146.9±1.9 Ma和162.6±2.6 Ma,与区域侏罗纪火山岩同位素年龄160~147 Ma基本一致。根据矿区外围白音诺尔花岗岩体锆石年龄142~115 Ma,可以推测双尖子山银多金属主成矿作用与侏罗纪构造—岩浆活动相关,而与后期大规模中酸性岩浆侵位并无直接的成因联系。根据矿床产出环境、矿化和热液蚀变特征的初步研究结果表明,双尖子山可能经历了多次矿化的叠加,其可能与古太平洋板块远程俯冲和中生代动力机制转换作用有关。Located in the southern segment of the Great Hinggan Mts. （ Da Hinggan Range, or Great Xing＇ an Mts. ） in Hinggan--Mongolia Orogenic Belt （XMOB）, the Shuangjianzishan Ag--polymetallic deposit in Balinzuo Qi（Balin Zuoqi; Baarin Left Banner） is a newly discovered superlarge scale epithermal deposit, which is closely related to the Mesozoic tectono-magmatic activities in space, age and genesis. The polymetallic mineralization （Ag, Zn, Pb, and Cu） hosted by the volcano--sedimentary rocks is composed of the layered, lenticular, wedge shaped and cystic orebodies occurring as disseminated, vein, sheet, and veinlets. Preliminary study showed that the sericite yielded an Ar-Ar plateau age of 146.9 ± 1.9 Ma, and the molybdenite from the silver polymetallic ore yielded a model age of 162.6 ± 2.6 Ma. These two ages are identical with the age of regional Jurassic volcanic rocks （160 - 147 Ma）. Therefore, the formation of the Shuangjianzishan silver polymetallic deposit is related to the Jurassic tectono--magmatic activities caused mainly by the remote effect of the subduction of the Mesozoic Paleo- Pacific plate during the tectonic transformation.

关 键 词：大兴安岭 巴林左旗 双尖子山银多金属矿床 白音诺尔—双尖子山—浩布高多金属矿集区 叠合成矿 

分 类 号：P618.2[天文地球—矿床学]