河南嵩县槐树坪金矿床地质特征及成因

Geological Characteristics and Metallogeny of the Huaishuping Gold Deposit in Songxian County,Henan Province

河南嵩县槐树坪金矿床赋存于中元古界熊耳群鸡蛋坪组断裂构造中,缓倾斜层间滑脱断裂为主要含矿构造,陡倾切层断裂次之。矿体形态简单,呈似层状、薄脉状、透镜状、豆荚状。矿体厚度、品位较稳定。黄铁矿为主要载金属矿物,金在矿物中以独立矿物存在,其赋存形式有三种,即粒间金、包裹金、裂隙金,以粒间金为主。矿石类型为浸染型、细脉-浸染型、脉状-网脉状3种,黄铁矿化、硅化、钾化与金矿化关系密切。槐树坪金矿成矿物质主要来源于太华群,与燕山期酸性岩浆侵入活动密切相关,属构造蚀变岩型金矿,该金矿的发现充分说明熊耳山地区缓倾斜层间滑脱断裂可以形成大型金矿。

The Huaishuping gold deposit occurs in the fracture structure of the Jidanping Formation,Xionger group,Middle Proterozoic. The main ore-bearing structures are gentle-interlayer detachment fault,followed by steeply inclined incision faults. Ore body shape is simple,looking like beds,thin veins,lenticulars and pods. The ore body thickness and grade are relatively stable. Pyrite is the major gold carrier minerals,gold as an independent mineral existing in the minerals. There are three kinds of occurrences： intergrain gold,inclusion gold and crack-gold,dominated by the first one. Ore types include disseminated,veinlet disseminated and net vein. Gold mineralization has close relation with pyritization,silicification and K-feldsparization. The ore-forming materials mainly came from the Taihua group. The ore deposit is closely related to the acidic magma intrusion activities in the granitoids of Yanshanian and is a tectonic alteration rock type gold deposit. The discovery of the Huaishuping gold deposit shows that it is possible to form a large gold deposit in the gentle detachment fault of the Xiong＇er Mountains region.