贵州天柱上公塘—大河边寒武纪重晶石矿床海底热水喷流沉积结构、构造特征  

Submarine Hydrothermal Venting—Flowing Sedimentary Characters of the Cambrian Shanggongtang and Dahebian Barite Deposits, Tianzhu County, Guizhou Province

作　　者：杨瑞东[1] 魏怀瑞[1] 鲍淼[1] 王伟 王强 

机构地区：[1]贵州大学研究生院,贵阳550025

出　　处：《地质论评》2007年第5期675-680,725-726,共8页Geological Review

基　　金：国家自然科学基金(批准号40462001);贵州大学博士点基金资助项目的成果。

摘　　要：贵州天柱寒武系重晶石矿床属世界上最大的重晶石矿床,其储量达到2亿吨以上。通过系统的野外调查,发现其中包含有大量的海底热水(液)喷流沉积形成的脉状构造、冲刷构造、饼状体构造、柱状体构造、块状构造、斑状构造、水平纹层构造、碳质膜壳构造等沉积构造和沉积构造序列,同时具有热水(液)喷流成因的黄铜矿、闪锌矿、黄铁矿、钡冰长石等典型矿物。建立了较为完整的天柱寒武系重晶石矿床沉积序列,为这一超大型矿床的成因提供了更直接的证据。The Cambrian barite deposits in Tianzhu County, Guizhou Province, was found the largest barite deposit in the world by now, it is up to 2×10^9 t proved reserves. Abundant the submarine hydrothermal water venting—flowing sedimentary structures were found in barite deposits, which are barite-vein structure in basal carbonaceous shale, eroding structure on basal carbonaceous shale, barite-discus structure and barite-pillar structure in basal barite deposit, thick bed barite, barite-stripe structure, horizontal bed structure and carbonaceous coat structure with an ascending order. In the same time, the typical hydrothermal water mineral, including pyrite, chalcopyrite, sphalerite, hyalophane were found in the barite deposit. The sediment sequence of barite deposit was established from investigation in the field work. Sr, Ba, Pb, Mn, Cu, Ni, Co, As, Zn elements are enriched, Th/U value is very low, negative Ce anomalies and positive Eu anomalies, and fluid inclusions about 200℃, which show that the barite belongs to hydrothermal water mineralization, and that deep mantle matter input in the barite.

关 键 词：沉积构造 地球化学 热水(液)喷流 重晶石 贵州 

分 类 号：P619.251[天文地球—矿床学]