陕西马元铅锌矿床矿石组构研究与成因意义

通过对马元矿床矿石组构研究,总结归纳矿床矿石主要结构包括自形晶结构、半自形结构、他形结构、包含结构、压碎结构;构造主要以角砾状为主,其次有浸染状、脉状构造、晶洞构造、雪顶构造。根据矿床矿体野外地质现象并结合镜下矿石组构和电子探针分析,认为马元铅锌矿床为典型的与后生热液有关的MVT铅锌矿床;热液期是其主要成矿期。根据矿物组合特征将热液期划分为石英-黄铁矿阶段、白云石-闪锌矿-方铅矿阶段。对矿体大量发育于角砾岩中、矿体中发育大量有机质进行探讨,总结角砾岩化、有机质和成矿作用的关系。

Ore fabric and genetic significance of Mayuan Pb-Zn deposit in Shanxi

Through studying the ore fabric of Mayuan deposit ,the authors summarized that the main ore tex-tures of the deposit included idiomorphic,hypidiomorphic,allotriomorphic,poikilitic and cataclastic texture. It was found that the ores occurred predominantly as brecciated in form with lesser disseminated,veined, miarolitic and snowcap structures.Based on the geological conditions of the orebodies in the field and com-bined with microscopic ore fabric and electron probe microanalysis,the authors believed that Mayuan Pb-Zn deposit was a typical MVT Pb-Zn deposit which was related to epigenetic hydrothermal solution,and its main metallogenic stage was in the hydrothermal stage.According to the mineral assemblage characteristics, the hydrothermal stage can be divided into quartz-pyrite period and dolomite-sphalerite-galena period.Then this paper focused on the large amount of orebodies occurred in breccia and the large quantity of organic mat-ter developed inside the ore bodies.At last the authors summarized the relationship between brecciation,or-ganic matter and mineralization.