湖南省黄金洞金矿田构造与成矿规律探讨

Study on tectonic and metallogenic law in Huangjindong gold ore field,Hunan province

在现代新构造学和成矿地质理论的指导下,以前人工作的研究为基础,重点对区内赋矿地层、矿脉特征、成矿条件及构造成矿方面做了深入的分析。提出了本区冷家溪群是矿源层,并且成矿物质不仅仅来自于围岩,还有一部分来自于地壳深部岩浆侵入;控制金矿田的是近EW向的3条区域韧性推覆剪切带,控制金矿体的是一些低次序在剪切带基础上的扩容断裂构造;金矿成矿与剪切变形存在密切的时空关系,长时间的强烈的剪切变形,不仅使矿体和围岩强烈变形,而且促使了成矿元素的高度富集;黄金洞金矿田矿脉主要分布在韧性剪切带上,因此今后主要工作在于寻找东西向的韧性剪切带。

Under the guidance of the new tectonics and ore-forming geological theory, and in the research base of previous work, the paper mainly analyzed the ore-host strata, the vein character, the geological conditions of ore- forming and the tectonic and metallogenic law. It was revealed that the source bed was Lengjiaxi group, and the metallogenic matter was not only from the surrounding rock, but also from the deep invading magma. 3 east-west regional ductile shear belts controlled the gold ore field and some low sequence expansion faults on the shear behs basis controlled the gold ore body. Gold mineralization and shear detormation had a close time and space relationship, A long period of strong shear deformation not only caused the strong deformation of ore bodies and surrounding rock, but also prompted a high degree enrichment of ore-forming elements. The ore veins of Huangjindong gold ore field mainly distributed in the ductile shear behs, so the next major task was to find the east-west ductile shear zones.