陕西铧厂沟金矿床成矿特征及物质来源研究  

Metallogenic characteristics and ore-forming material sources of the Huachanggou gold deposit in Shaanxi Province

作　　者：杨隆勃[1] 刘家军[1] 王建平[1] 杨增海[1] 陈冬[2] 李志国[2] 王维钰 王立新[3] 于康伟 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国黄金集团公司,北京100011 [3]陕西略阳铧厂沟金矿,陕西略阳724312

出　　处：《中国地质》2013年第4期1218-1230,共13页Geology in China

基　　金：国家自然科学重点基金项目(41030423);中国地质调查局地质调查工作项目(1212011220924);中国黄金集团公司及其他项目(武黄研[任务书];WHY(05)-03)共同资助

摘　　要：陕西略阳铧厂沟金矿床为小型金矿。矿床赋存于南秦岭地区中下泥盆统三河口群地层的细碧岩和海相碳酸盐岩中;矿体明显受层间断裂构造控制。金矿石主要有细碧岩型金矿石、灰岩-石英脉型金矿石和石英砂岩型金矿石三种,分别赋存在主矿带、北矿带、南矿带和南南矿带中。本文通过硫、铅、碳、氢、氧等同位素以及微量元素、稀土配分型式等方面的系统研究发现,铧厂沟金矿中的细碧岩矿石与灰岩矿石在同位素组成、微量元素Q型聚类以及稀土配分型式上均有较大差异,前者成矿物质来源为深源特征,后者成矿物质来源为地壳(沉积)特征,且两种矿石分别显示出与赋矿围岩的紧密联系,表明成矿金属物质、硫、铅和碳主要来自赋矿的基性火山岩系和海相碳酸盐岩地层。氢、氧同位素显示成矿溶液主要来自加热的循环地下水,部分流体来源与岩浆水有关。Located in L ueyang County of Shaanxi Province,the Huachanggou gold deposit is a small-sized deposit which is currently being mined.The gold deposit occurs in the slightly metamorphosed Middle and Lower Devonian strata composed of mafic volcanic rocks（spilite） and marine carbonate rocks.Gold mineralization is strictly controlled by a fault zone.There are mainly three types of ores： altered spilite gold ore,limestone quartz gold ore and quartz sandstone gold ore.These three types of ores occur respectively in the main ore belt,the north ore belt and the south ore belt,and the south-south ore belt.The S,C,Pb,H and O isotopic compositions show that there is a distinctive difference between the spilite ore and the limestone ore： the oreforming material source of the former ore came from deep source while that of the latter ore was derived from the upper crust.The Q-type cluster analysis of the trace elements and the REE distribution patterns show that the spilite ore and the limestone ore were closely related to the wall rocks.The geochemical characteristics clearly show that the ore-forming material sources came from the mafic volcanic rocks and the marine carbonate rocks.The data obtained also suggest that the ore-forming fluid was derived predominantly from an active meteoric groundwater system with the addition of small amounts of volcanic water.

关 键 词：地质特征 地球化学特征 物质来源 金矿床 

分 类 号：P618.51[天文地球—矿床学] P597.2[天文地球—地质学]