陕西凤县太山庙铜矿地质特征及找矿方向
Geological Characteristics and Prospecting Direction of Taishanmiao Copper Deposits in Fengxian County,Shaanxi Province
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摘要: 凤县太山庙铜矿点位于凤(县)-太(白)矿集区南部铅硐山-苇子坪-铜牌沟铜铅锌多金属成矿带之铁炉湾-九子沟矿化区, 区内从西到东矿化分带明显, 成矿条件十分有利。太山庙铜矿赋存于中泥盆统古道岭组灰岩与星红铺组千枚岩接触界面及其附近, 属沉积-改造型矿床;背斜构造、中泥盆统古道岭组灰岩与上泥盆统星红铺千枚岩接触带和硅化、黄铁矿化等蚀变是其主要找矿标志。目前,在太山庙铜矿区已发现K1、K2两条铜矿体, 矿石类型以硅化灰岩型为主, 其次为硅化千枚岩型、含铜石英-方解石脉型及硅质岩型。通过与东部凤县九子沟铜矿床对比研究, 认为二者处于同一含矿层位, 区内找矿应关注背斜构造转折端及其翼部的古道岭组灰岩和星红铺组千枚岩接触界面这2个主要找矿标志, 注意背斜南翼铁碳酸岩脉及平行背斜构造, 结合化探异常和物探异常, 进而优选靶位开展深部工程验证, 按照这一指导思想和工作方法, 在区内及太山庙铜矿点有望取得新的找矿突破。Abstract: The Taishanmiao copper deposit of Fengxian County is located in Tieluwan-Jiuzigou mineralized district of Qiandongshan-Weiziping-Tongpaigou Cu-Pb-Zn polymetallic mineralizationbelt, south of Fengxian-Taibai ore-concentrated area.Mineralization zoning is clear from east to west of this area and metallogenetic conditions are favorable. Ore body occurs at the contact zone or nearby of Middle Devonian Gudaoling formation limestone and Upper Devonian Xinghongpu formation phyllite, belonging to sedimentary-reformation deposit. Anticline, contact zone of limestone and phyllite, silication and pyritization are the main indicators for prospecting. Ore bodies including K1 and K2 are found in this deposit, in which silicified limestone is the main ore type, followed by silicified phyllite type, copper-bearing quartz-calcite vein type and siliceous rock type. Comparing with Jiuzigou copper deposit in the east of Fengxian county, they are in the same ore-bearing position, prospecting should thus be based on transition and two wing twists of anticline and contact of limestone and phyllite, attention also should be paid to iron-carbonate veins of southern anticline and parallel to it. Combined with geophysical and geochemical anomaly, we can define optimal target and conductin-depth engineering test. Based on this exploration method and procedure, new prospecting break through is expected tobe madein Taishanmiao copper deposit.
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