摘要
特提斯域是全球最重要的密西西比河谷型(MVT)铅锌矿床富集区,矿床广泛地分布在陆-陆碰撞造山带两侧的陆块上,就位于碰撞形成的褶皱-逆冲带和前陆带内,成矿通常发生在碰撞挤压作用晚期或之后、区域处于走滑或伸展的阶段。矿床、矿体的就位与张性断裂密切相关,主要控矿因素有蒸发盐底辟构造、碳酸盐岩溶蚀垮塌构造、蒸发盐溶蚀垮塌构造、高孔隙度白云岩、含重晶石地层等。油气流体在许多矿床和矿集区出现,其主要通过与硫酸盐发生反应为铅锌成矿提供还原硫。陆-陆碰撞的大地构造环境、大量的蒸发盐、丰富的油气流体是特提斯域富集MVT矿床的重要原因,域内寻找MVT矿床的潜力巨大。
The Tethyan domain hosts the world’s most abundant Mississippi Valley-Type(MVT)Pb-Zn deposits,which occur in fold-thrust belts and forelands on both sides of the continent-continent collisional zone through the whole Tethyan domain.Mineralization commonly took place when the ore districts were experiencing strike-slip or extensional deformation,which occurred after regional compression or during the late stage of a compressional deformation event.The main ore-controlling factors include extensional faults,evaporite diapir,carbonate dissolution and collapse,evaporite dissolution and collapse,porous dolostone,and barite-bearing strata.Records of hydrocarbon fluids are present in many Pb-Zn deposits and ore districts of the Tethyan domain.They reacted with(dissolved)sulfate to provide reduced sulfur for the ore formation.The generation of such abundant MVT Pb-Zn deposits in the Tethyan domain can be attributed to the continent-continent collisional tectonic setting,large amounts of evaporites,and plentiful hydrocarbon fluids.This study raises the exploration potential for MV TPb-Zn deposits in the Tethyan domain.
作者
宋玉财
侯增谦
刘英超
张洪瑞
SONG Yucai;HOU Zengqian;LIU Yingchao;ZHANG Hongrui(Institute of Geology, CAGS, Beijing 100037, China)
出处
《中国地质》
CAS
CSCD
北大核心
2017年第4期664-689,共26页
Geology in China
基金
国家重点研发计划项目(2016YFC0600306)
国家自然科学基金项目(41773043
41320104004
41773042
41772088)
国土资源大调查项目(DD20160024-02)资助~~
关键词
密西西比河谷型矿床
陆.陆碰撞
蒸发盐
油气流体
张性断裂
特提斯
Mississippi Valley-Type lead-zinc deposit
continent-continent collision
evaporite
hydrocarbon fluids
extensional fault
Tethys
