兰坪盆地金顶超大型铅锌矿床成矿年龄探讨  

THE METALLOGENIC AGE OF JINDING SUPER-LARGE SCALE LEAD-ZINIC DEPOSIT IN LANPING BASIN

作　　者：李志明[1] 廖宗廷[2] 刘家军[3] 秦建中[1] 张长江[1] 

机构地区：[1]中石化石油勘探开发研究院无锡实验地质研究所,江苏无锡214151 [2]同济大学海洋与地球科学学院,上海200092 [3]中国地质大学地球科学与资源学院,北京100039

出　　处：《地质找矿论丛》2006年第1期23-27,共5页Contributions to Geology and Mineral Resources Research

基　　金：国家重点基础研究发展规划项目(G1999043208);中国石化西部新区勘探指挥部科技项目(XBKY04-34)资助

摘　　要：兰坪盆地金顶超大型铅锌矿床由于受样品和测年技术的制约，目前尚没有获得可靠的成矿年龄数据；矿区地质和矿床特征分析揭示成矿作用发生于沉积成岩和推覆体形成之后。据此结合区域构造演化特征。从赋矿层位、已有同位素定年结果和成矿流体有变质水参与三个方面论述该矿床的成矿时间范围。最后认为矿床的成矿年龄为27-34Ma．该时期总体挤压背景下的局部拉张这种构造动力体制转换，可能是金顶超大型矿床形成的关键制约因素。It has not obtained reliable data of metallogenic age of the Jinding super-large scale lead-zinc deposit in Lanping basin due to the restricting of sample and technique of dating methods. The characteristics of geology and deposit of the Jinding lead-zinc ore deposit shows that ore-formation occurs after the orebearing stratum deposition and lithificotion and the nappe. The range of metallogenic age have been studied around three aspects, i.e. the ore-bearing stratum, the known dating result of isotopic chronology and the ore-forming fluids involved with metamorphic water and the characteristics of geology of ore district and the evolution process of regional structure. Finally, it is concluded that the metallogenic age of Jinding super-large scale lead-zinc deposit is 27-34 Ma, the transition of tectonic and dynamic regime of the local extension under the overall compressional setting may be the key factor which controlling forming of the Jinding lead-zinc deposit during this period.

关 键 词：金顶超大型铅锌矿床 赋矿层位 推覆作用 变质水 成矿年龄 云南省 

分 类 号：P597.3[天文地球—地球化学] P618.4[天文地球—地质学]