陇南市安坪金矿地质特征及找矿方向

陇南市安坪金矿位于秦岭褶皱系南秦岭迭部—武都断裂褶皱带东段,小金厂岩体及其外接触带附近。出露地层为中泥盆统古道岭组(D22g1)和下石炭统(C1),岩性以砂质板岩、千枚岩,中厚层灰岩为主,金矿体严格受EW向(F2)断裂控制,围岩蚀变以硅化、褐铁矿化、黄铁矿化为特征,主要载金矿物为褐铁矿、黄铁矿、毒砂。断裂构造、中酸性侵入岩是控制矿床形成的基本条件,近EW向构造蚀变带、石英闪长岩岩体外围及区内化探异常发育部位是找矿有利地段。初步评价认为该金矿成矿条件优越、化探异常发育、地表和浅部延伸稳定,具有一定潜力,对西秦岭地区金矿勘查具有借鉴意义。

Geological Characteristics of Anping Gold Deposit in Longnan District

Anping gold deposit in Longnan district is located the east section of Diebu-Wudu folds in the south part of Qinling fold system. The outcrop are Middle Devonian Gudongling Formation and Lower Carboniferous Formation, which is composed of sandy slate, phyllite, limestone. The ore bodies are strictly controlled by F2 fault EW direction. The alteration are silicification, ferritization and pyritization. The mineral bearing gold are limonite, pyrite, arsenopyrite. Fault structures and intermediate-acid intrusion should be the essential condition controlling the formation of gold deposit.