湘中锡矿山矿田稻草湾锑矿床的发现及地质意义

Discovery and geological significance of Daocaowan antimony deposit in the Xikuangshan ore field,Central Hunan

湘中锡矿山锑矿田是世界上已探明最大的锑矿集区。由于其开采时间长、深度大、资源保有量低,急需开展矿田深边部勘查找矿工作。近些年经过勘查在锡矿山矿田北东部新发现稻草湾锑矿床。通过其与锡矿山矿田典型矿床成矿特征对比,发现它们在控矿特征、赋矿地层、围岩蚀变以及矿石组成等方面均一致。同时对稻草湾锑矿床辉锑矿床进行电子探针分析,与锡矿山锑矿床辉锑矿对比,发现二者具有相似的辉锑矿主、微量元素组成。据此,本文提出新发现的稻草湾矿床为锡矿山锑矿田的一部分,认为其可以归属为锡矿山锑矿田的第五大矿床。该矿床的发现也揭示出锡矿山矿田具有良好的深边部找矿潜力。本文认为新发现的稻草湾锑矿床对进一步认识完善锡矿山锑矿田的成矿机制提供了新的方向,同时对指导区域找矿具有重要的意义。

The Xikuangshan antimony deposit of central Hunan,South China is the largest antimony deposit in the world.Due to its long mining time,deep depth and low reserves of resources,it is urgent to carry out exploration prospecting in the deep margin.In recent years,a new antimony deposit,Daocaowan antimony deposit,has been discovered in the northeastern part of the Xikuangshan ore field through geological survey.By contrast with the xikuangshan ore field geological characteristics,we found that the ore-controlling characteristics,ore-bearing strata,wall rock alteration and ore characteristics of Daocaowan antimony deposit are consistent with those of Xikuangshan.At the same time,the EPMA analysis of Daocaowan stibnite was carried out.By comparing with the stibnite in Xikuangshan,it was found that the two have similar stibnite major and trace element composition.Therefore,we propose that the Daocaowan deposit is a part of the Xikuangshan ore field,and it is considered to be the fifth largest deposit in the Xikuangshan.This also reveals that the Xikuangshan ore field has the potential for further deep prospecting.This paper considers that Daocaowan deposit provides a new direction for further understanding and improving the metallogenic mechanism of Xikuangshan ore fields,and is of great significance for guiding regional prospecting.