黑龙江翠宏山铅锌多金属矿区花岗岩锆石SHRIMP U-Pb测年及其地质意义  

Zircon SHRIMP U-Pb Dating of Granite in the Cuihongshan Polymetallic Deposit and Its Geological Implications

作　　者：邵军[1] 李秀荣[1] 杨宏智[1] 

机构地区：[1]沈阳地质矿产研究所,辽宁沈阳110034

出　　处：《地球学报》2011年第2期163-170,共8页Acta Geoscientica Sinica

基　　金：国土资源大调查项目(编号:200310200052)资助

摘　　要：翠宏山铅锌多金属矿床产在花岗岩体与下寒武统西林群铅山组变质岩系的接触带内,是一矽卡岩型铅锌多金属矿床。岩浆活动强烈,具有脉动活动特点,形成的岩石类型主要有二长花岗岩、碱长花岗岩,总结岩石地球化学特征,认为二者分别具有"I"型花岗岩和"A"型花岗岩特征,花岗岩的形成与造山后伸展作用有关。采用锆石U-Pb方法确定了岩浆岩的形成年龄,获得二长花岗岩年龄为192.8±2.5Ma、199.0±3.1Ma。研究认为,铅锌多金属成矿与岩浆活动关系密切,成矿作用发生在印支晚期-燕山早期。The Cuihongshan Pb-Zn polymetallic deposit has been regarded as a skarn type ore deposit that occurs in the contact zone between the granite and the metamorphic rocks of the Qianshan Formation of the Lower Cambrian Xilin Group.This study has revealed that the granitic rocks are composed mainly of monzogranites,alkali-feldspar granites with the characteristics of both ＂I＂ type granite and ＂A＂ type granite.The granite was generated in the post-orogeny extensional system.Besides,the magmatism of these rocks had a very close relationship with the Pb-Zn polymetallic mineralization.Zircon SHRIMP U-Pb dating shows that the formation ages of two monzonitic granite samples in the Cuihongshan ore deposit are 192.8±2.5Ma and 199.0±3.1Ma,respectively.It is thus suggested that the mineralization age of the Cuihongshan Pb-Zn polymetallic deposit is Late Indosinian-Early Yanshanian.

关 键 词：花岗岩 造山后伸展作用 成矿年龄 印支晚期-燕山早期 翠宏山铅锌多金属矿床 

分 类 号：P578.941[天文地球—矿物学] P597.1[天文地球—地质学]