福建屏南黛溪铅锌矿床地质特征与成因

On Geological Characteristics and Genesis of the Daixi Lead-Zinc Deposit in Pingnan County, Fujian Province

福建屏南黛溪铅锌矿床形成于火山活动频繁的断陷带中。矿体产于火山基底“构造窗”震旦纪龙北溪组地层中 ,矿化受绿片岩相控制 ,矿体呈似层状 ,与围岩产状一致。矿石具特殊的结构和构造 ,矿物组分简单 ,品位低 ,规模较大。硫主要来源于花岗质岩浆 ,铅来源于地壳 ,有陆源铅混染。表现为“层控型”矿床特征和多期次地质作用的叠加改造。

The Daixi lead zinc deposit in Pingnan County, Fujain Province exists in the volcanic basement windows (in Sinian Longbeixi Formation Strata) and in the fault downwarping belt to which the volcanic activities frequently occurred The mineralization of the deposit is controlled by the green schist phase The orebodies of the deposit emerge as parabedded and are consistent with the occurrence of their county rocks The deposit is characteristic of peculiar textures and structures of its orebodies, simple mineral composition, large scale but lower ore grade The sulphur in the deposit derives itself from the granitic magma and the lead from the crust There is the lead contamination of terrigenous deposit It is shown that the deposit is strata bound and underwent multiple stages of superimposed reformation