大溶溪层控夕卡岩型白钨矿床之成矿与控矿因素

Metallogeny and ore-control factors of Darongxi strata bound skarn scheelite deposit

大溶溪白钨矿床产于辰山花岗岩体外接触带下震旦统南沱砂岩组热变质晕(带)内,矿体沿南沱砂岩组作层状、似层状及厚大的透镜体状自然延伸,矿床规模为大型,产状稳定。矿体严格受断裂及不整合面的控制,岩体和特定层位是矿床形成的必要条件,成矿作用主要发生在印支期,由岩体与围岩作用形成的高温热液沿构造裂隙充填交代成矿。矿床为与夕卡岩化有密切成因联系和空间关系的层控夕卡岩型白钨矿床。

Darongxi sheelite deposit occurs in thermal metamorphic halo at outer contact zone in Nantuo sandstone formation of Lower Sinian Series as naturally extended thick layer or layeroid lenses.It is a stable large size deposit strictly controlled by fracture and unconformable plane.Intrusive body and specific horizon are the prerequisites for its formation.The metallogeny took place in Indo-China period and the deposit is formed by high temperature fluid filling and replacement along fracture and temporally and spatially and genetically related to skarn.