赣北发现“五层楼”式石英脉型黑钨矿矿床——东坪黑钨矿矿床的发现及其地质意义

A “Five-storey” Style Quartz Vein Wolframite Deposit in Northern Jiangxi Province: The Discovery of the Dongping Wolframite Deposit and Its Geological Significance

据江西省武宁县东坪矿床2015年最新勘查成果,初步认为此矿床是典型的"五层楼式"石英脉型黑钨矿床。矿床规模巨大,成矿岩体为早白垩世黑云母二长花岗岩,矿区蚀变以脉状硅化为主,硅化脉垂向上自下发育线脉带→细脉带→薄脉带→大脉带→尖灭带,其中前四个石英脉带均产出于外接触带双桥山群,巨脉带-尖灭带发育于岩体中。金属矿物以黑钨矿、黄铜矿为主,次为磁黄铁矿、闪锌矿、毒砂、辉银矿、辉铋矿、黄铁矿、少量辉铜矿、白钨矿、蓝铜矿、褐铁矿等。综合研究表明,推断深部岩体与围岩的内接触带存在似层状蚀变花岗岩型钨铜矿体,同时矿区外围该类矿床的找矿潜力大。该矿床的发现结束了赣北至今没有发现典型"五层楼"式石英脉型黑钨矿床的历史,也是构成了"南钨北扩"的重要矿床,对赣北地区找矿突破具有极其重要的指导意义。

The surveying results obtained in the Dongping deposit of Wuning County in Jiangxi Province shows that the deposit is a typical ＂five-storey＂ style quartz vein type tungsten deposit. The scale of the deposit is very huge, with Early Cretaceous biotite adamellite being the mineralized body, and veined silicification being the main alteration in the ore district. Vertically, there is the zoning of zone→veinlets zone →thin vein zone→thick vein zone→pinch out zone in upward succession, and the first four quartz veins all occur in the outer contact zone of Shuangqiaoshan Group, with the giant vein pinch out zone developed in the rock. Wolframite and chalcopyrite are the mainly metallic minerals, whereas minor minerals include pyrrhotite, sphalerite, farsenopyrite, argentite, arsenic sulfide silver, bismuthinite, bismuthinite sulfur, and pyrite, with a small amount of chalcocite, scheelite,azurite and limonite. Comprehensive studies have shown that there exists a big potential of bedded mineral alteration granite type tungsten orebody between deep rocks and the inner contact zone of the rock, and that there might exist a similar deposit on the periphery of the ore district. The discovery of this ore deposit ended the history that there was no typical ＂five-storey＂ style quartz vein wolframite deposits in northern Jiangxi, and it is also an important ore deposit extending from the south to the north. The discovery of this ore deposit has an extremely important significance for prospecting breakthrough in northern Jiangxi.