浅析安徽省新桥S-Fe矿田的成因  

A preliminary discussion on genesis of Xinqiao S-Fe orefield

作　　者：臧文拴[1] 吴淦国[1] 张达[1] 张祥信[1] 李进文[2] 刘爱华[1] 张忠义[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京10083 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿床地质》2007年第4期464-474,共11页Mineral Deposits

基　　金：国家重点基础研究发展规划项目(编号G1999043206)资助

摘　　要：为探讨新桥(S-Fe-Cu-Au)矿田的成因,笔者在近10年野外系统观察的基础上,通过对野外地质的系统分析研究和部分硫、铅同位素测试,认为新桥矿田的形成经历了两期成矿作用,即沉积成矿作用和与岩浆活动有关的成矿作用。沉积作用形成了菱铁矿矿体和胶黄铁矿矿石等,而岩浆作用是形成块状硫化物矿体的主要原因。硫化物矿体围绕岩体具有岩体→磁铁矿、黄铁矿→黄铁矿、黄铜矿和自然金→黄铁矿和铅、锌矿的分布特征,原生金矿体具有围绕岩体呈环状分布的地质特征。形成富的块状硫化物矿体的成矿流体可能为类似矿浆的富硫化物流体。The Xinqiao S-Fe-Cu-Au ore field is located in the Tongling ore cluster in Middle-Lower Yangtze Valley. There have been various opinions concerning the genetic type of this orefield put forward by different geologists in recent years, such as sedimentary-reformation type, stratabound-skarn type and sedimentary submarine rock- hosted exhalative type. Based on nearly ten years of systematic geological field observation and analysis of Pb and S isotopic composition of the Xinqiao orefield, the authors hold that it was formed in two ore-forming periods. The first period took place during the syngenetic sedimentary process, whereas massive sulphide ore bodies were mainly formed during the second period, i.e., the Yanshanian granitic magnatism. The sulfide metallic mineral associations show zoning around a granite intrusion, in order of magnetite, pyrite → pyrite, chalcopyrite and native gold→ pyrite, sphalerite and galena. The gold ore bodies occur outside the contact zone of the granite intrusion.

关 键 词：地质学 地质特征 成矿作用 块状硫化物 新桥矿田 

分 类 号：P618.31[天文地球—矿床学]