湘西地区北洛塔和花垣铅锌矿田对比研究

洛塔矿田和花垣矿田是湘西北成矿带铅锌储量较大的两个矿田。文章以洛塔矿田和花垣矿田为研究对象,在前人研究的基础上,从成矿地质构造背景、矿床地质特征、地球化学特征、控矿规律、矿床成因等方面对两大铅锌矿田进行对比研究,发现两矿田在诸多方面存在差异。洛塔矿田铅锌成矿时代为中泥盆世,花垣矿田铅锌成矿时代为早泥盆世,属于上扬子地台东南缘伸展拉张环境下在湘西北地区不同时期不同地段深大断裂活动的产物;构造是两矿田内最重要的控矿要素,岩相、岩性控矿实质上岩石孔隙和裂隙系统控矿,也是构造控矿的一种体现。区内的找矿工作应该沿着控矿构造+有利地层岩性组合的思路进行。

A Comparative Study of Luota and Huayuan lead-zinc ore field in the Northwest Hunan province

Relative big Pb-Zn reserves occur at Luota and Huayuan lead-zinc orefields in the Northwest HuNan province lead-zinc ore belt. Based on the previous data comparative study of the two ore fields is carried out in respects of geotectonic background, geological characteristics of the ore deposits, geochemical characteristics, ore-control pattern, ore genesis etc. Results show that there are some differences between them. Ore in Luota ore field is formed in Middle Devonian Epoch while Huayuan orefield in Early Devonian Epoch. They are the products of deep fault activity in the southwest margin of Yangtze Platform at different times and places. Structure is the most important ore-control factor in the two ore fields and facies and lithology control on ore is the reflection of structure, i.e. the pore, crack control on the ore. Ore prospecting work in Luota and Huayuan lead-zinc ore fields should follow the philosophy of ore-control structure plus favorite strata and lithology.