西藏冈底斯成矿带东段主要钼多金属矿床成矿规律研究  

Study on Metallogeny of Main Molybdenum Polymetallic Deposits in the Eastern Section of the Gangdese Metallogenic Belt

作　　者：王立强[1] 唐菊兴[1] 郑文宝[1] 陈伟[1] 林鑫[2] 康浩然 罗茂澄[3] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]成都理工大学地球科学学院,成都610059 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地质论评》2014年第2期363-379,共17页Geological Review

基　　金：中国地质调查局青藏专项项目(编号1212011085529);国家重点基础研究发展计划(973)项目(编号2011CB403103)联合资助成果

摘　　要：文章以钼成矿作用为主线,对冈底斯东段主要钼多金属矿床成因类型、空间分布特征进行了总结,对主要钼多金属矿床成矿时代进行了统计,识别出了5期钼成矿事件。基于前人研究成果,对主要斑岩—矽卡岩钼多金属矿床成矿岩浆岩基本地质特征、岩浆岩主量元素、稀土和微量元素、锶同位素地球化学特征进行了阐述并对比了独立钼矿、钼(铜)矿、铜(钼)矿和钼多金属矿成矿岩体特征之间的差异。通过对南冈底斯南缘至冈底斯弧背断隆带不同钼多金属矿床成矿岩体锆石Hf同位素、矿石硫化物Pb同位素的梳理阐明了成岩—成矿物质源区差异与矿化元素组合空间分带之间的耦合关系。基于冈底斯东段钼多金属矿床产出大地构造位置及其形成时代,文章最后对主要钼成矿事件的动力学背景进行了初步探讨。Rendering molybdenum mineralization as the main line, this paper summarizes the genetic types, spatial distribution of the main molybdenum polymetallic deposits in the eastern section of the Gangdese and counts their metallogenic epochs. Then this study recognizes five molybdenum mineralization events in the eastern section of the Gandese. Based on previous research, this article illustrates the basic geological characteristics, major elements, rare earth elements, trace elements and strontium isotope geochemistry of metallogenic igneous rocks in the main porphyry--skarn molybdenum polymetallic deposits. At the same time, the author compares the difference of metallogenic lithosome features between independent molybdenum deposits, molybdenum （copper） deposits, copper （molybdenum） deposits and molybdenum polymetallic deposits. Based on analyzing Hf isotope of zircons from the ore-forming intrusive rocks and Pb isotope of ore sulfides of the main molybdenum polymetallic deposits in a certain area where is from the south edge of the southern Gandese to the Gangdese arc uplift belt, this assay tries to clarify the relationship between different diagenetic--metallogenetic material sources and spatial zonation of mineralized elements. Based on geotectonic location and formation epoch of molybdenum polymetallic deposits in the east section of the Gandese, the geodynamic background of the main molybdenum metallogenic events is discussed at the end of this article.

关 键 词：钼成矿事件 岩浆岩特征 成岩-成矿物质源区 矿化元素组合 动力学背景 冈底斯东段 

分 类 号：P618.2[天文地球—矿床学]