藏东波里拉组地层中类MVT型铅锌矿床成矿机制分析  

Metallogenic Mechanism of the MVT-like Pb-Zn Deposits Hosted in the Bolila Strata in East Tibet

作　　者：宋世伟[1] 张成江[1] 宋昊[1] 胡涛 郗秋勇 张遵遵 

机构地区：[1]成都理工大学,四川成都610059 [2]西藏地勘局第六地质大队,西藏拉萨851400 [3]西藏地勘局第五地质大队,青海格尔木816000 [4]武汉地质调查中心,湖北武汉430205

出　　处：《地质与勘探》2014年第1期96-104,共9页Geology and Exploration

基　　金：西藏自治区矿产资源潜力评价(编号:1212010881631);四川石渠-甘孜-理塘地区铜金银多金属典型矿床研究与找矿靶区评价(编号:1212011220391)联合资助

摘　　要：藏东地区广泛分布着NW-SE、近S-N的上三叠统波里拉组碳酸盐岩地层。波里拉组以其所处的独特地层层序和活泼的化学性质,使成矿流体在该地层中运移时与碳酸盐岩发生水-岩反应,最终导致流体的化学平衡被破坏而卸载成矿;此外,主要呈NW-SE、近S-N分布的波里拉组因其力学性质较弱,在藏东地区新生代以来广泛发育的NW-SE、近S-N向张扭性、张性断裂的作用下,极易发生顺层剪切破碎和张性破碎,破碎带为流体减压沸腾和流体混合成矿作用提供了良好的条件和贮矿空间。据现有的地质工作,已经在该地层中发现了一系列类MVT型铅锌矿,该地层中类MVT型铅锌矿仍然具有很大的找矿潜力。The NW-SE and nearly S-E-trending upper Triassic Bolila Fro. carbonate strata are widely distributed in east Tibet. The Bolila strata have special stratigraphic sequence and active chemical properties, and cause water-rock reaction when ore-forming fluids transport in the stratum, leading to disequilibrium of ore fluids and orebody formatiom In addition, the NW-SE and nearly S-N-trending Bolila strata tend to break up due to their weaker me- chanical properties, forming ore-hosted space for fluid boiling and mixing mineralization. Geological work has revealed a series of MVT-like Pb-Zn depos- its, indicating a great potential for prospecting this kind of deposits in the strata of this area.

关 键 词：波里拉组 类MVT型铅锌矿 断裂破碎带 成矿流体 藏东 

分 类 号：P618[天文地球—矿床学]