西藏冈底斯矿带成矿作用及远景分析  

Study on the Metallogenesis and Resource Perspective of the Gangdisi Ore Deposit Belt in Tibet

作　　者：梁华英[1] 喻亨祥[2] 莫济海[1] 曾提[1] 胡光黔[1] 

机构地区：[1]中国科学院广州地球化学研究所成矿动力学重点实验室,广州510640 [2]桂林工学院,桂林541004

出　　处：《矿物岩石地球化学通报》2008年第3期289-293,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40772054,40472049);西部矿业西藏资源投资公司应用基础研究项目联合资助

摘　　要：冈底斯带矿床众多,类型复杂,主要有斑岩型铜(金-钼)矿床、矽卡岩型铁铜-铅-锌(银)矿床、层控铅-锌-银矿床、火山岩型金-银矿床及雄村式铜-金矿床。矿床地质特征和同位素年龄表明,冈底斯带南部的矿床与新特提斯洋壳向北俯冲-陆陆碰撞及碰撞期后的构造岩浆事件有关;冈底斯带北部的矿床与班公湖-怒江洋壳向南俯冲-陆陆碰撞及碰撞期后构造岩浆事件有关。冈底斯带与洋壳的俯冲-碰撞有关的岩浆活动强烈,成矿条件优越。西藏高原在碰撞后发生了快速抬升剥蚀,部分矿床顶部出现低温组合矿化,多数矿床保存良好。A lot of different types of ore deposits have been found in the Gangdisi belt in Tibet, including porphyry Cu （Au, Mo） deposits, skarn Fe-Cu-Pb-Zn （Ag） deposits, strata-bound mineral deposits, epithermal deposits, and the Xiongcun type Cu-Au deposit. Geological characteristics and a new set of isotope ages of deposits reveal that the deposits found the southern Gangdisi belt have been resulted from the a series of structural-magmatic processes such as the southward subduction of the new Tethyan ocean crust, the collision of Indian plate toward the Asia plate, following by the post-collision. The deposits located in the northern Gangdisi belt are corresponded to the southward subduction of the Bangonghu-Nugiang ocean crust and then the collision of the Qiangtang terrane with the Lhasa terrane. There are a lot of mamatie rocks in the southern and northern borders of the Gangdisi belt resulted from the ocean crust subduction and the afterward continental collision. The strong magmatic activities provided excellent conditions for the formation of different types of ore deposits in the Gangdisi belt. The Tibet Plateau has undergone quick uplift and denudation after Indian-Asia collision. The upside of the most ore deposits croping out in the Gangdisi belt are characterized by relatively low temperature mineral assemblage, suggesting that the most of the deposits protect from denudation.

关 键 词：矿床成因 岩浆活动 冈底斯带 西藏 

分 类 号：P611[天文地球—矿床学]