Re-Os isotope dating of pyrite from the footwall mineralization zone of the Xinqiao deposit,Tongling,Anhui Province:Geochronological evidence for submarine exhalative sedimentation  

作　　者：GUO WeiMin LU JianJun JIANG ShaoYong ZHANG RongQing QI Liang 

机构地区：[1]State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China [2]State Key Laboratory o fOre Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

出　　处：《Chinese Science Bulletin》2011年第35期3860-3865,共6页

基　　金：supported by the National Natural Science Foundation of China (40930742 and 40221301);the Key Project of Natural Science Foundation of Jiangsu Province (BK2008026);the National Key Technology R&D Program (2009BAB43B03);a Ph.D. Program from the Foundation of the Ministry of Education of China (1999028435)

摘　　要：The Xinqiao deposit is located in the Tongling area,Anhui Province.This deposit is dominantly composed of stratiform sulfide orebodies,which are restricted to the transitional zone from clastic rocks to carbonates at the base of the Late Carboniferous Huanglong Formation.There are discordant veinlets or networks of mineralization in the footwall rocks below the stratiform sulfide orebodies.The underlying discordant mineralization zones coexist with conformable stratiform sulfide orebodies,which are considered to be the most representative features of massive sulfide deposits formed by submarine exhalative sedimentation.This study reports a pyrite 187Re-187Os isotopic age of 319±13 Ma(MSWD=16) for the footwall mineralization zone.This isochron age is consistent with the interval of strata hosting the conformable stratiform sulfide orebody,and provides direct geochronological evidence for Carboniferous exhalative sedimentary mineralization.The Xinqiao deposit is located in the Tongling area, Anhui Province. This deposit is dominantly composed of stratiform sulfide orebodies, which are restricted to the transitional zone from clasfic rocks to carbonates at the base of the Late Carboniferous Huanglong Formation. There are discordant veinlets or networks of mineralization in the footwall rocks below the stratiform sul- fide orebodies. The underlying discordant mineralization zones coexist with conformable stratiform sulfide orebodies, which are considered to be the most representative features of massive sulfide deposits formed by submarine exhalafive sedimentation. This study reports a pyrite 187Re-IS7Os isotopic age of 319±13 Ma （MSWD=16） for the footwall mineralization zone. This isochron age is consistent with the interval of strata hosting the conformable strafiform sulfide orebody, and provides direct geochronological evidence for Carboniferous exhalative sedimentary mineralization.

关 键 词：海底喷流沉积 同位素年代学 矿化带 同位素定年 下盘 安徽铜陵 新桥 证据 

分 类 号：P736.2[天文地球—海洋地质]