内蒙古赤峰地区上二叠统砂(页)岩型铜(金)矿的发现及其地质意义

2007年至2010年原赤峰市金田矿业有限责任公司在勘查巴林右旗馒头沟铜(金)矿时,发现该矿成因类型属于砂(页)岩型铜(金)矿,容矿岩石是上二叠统林西组砂页岩。矿区构造简单,林西组地层为一向SE倾的单斜构造。矿区林西组地层厚度大于600 m,目前已发现含矿地层厚度约214.7 m,含8个矿层,矿体呈层状、似层状、透镜状,矿石矿物以他形粒状黄铜矿和自然金为主,均呈微细浸染状散布于砂页岩中,局部有成岩期后形成的细脉状,地层普遍含黄铁矿。此类矿床在内蒙古乃至北方属首次发现,其研究成果不仅及时指导了馒头沟矿床的勘查,而且对内蒙古乃至北方上二叠统寻找同类矿床具有重要的意义。

Discovery and Geological Implication of the Upper Permian Sandstone (Shale)-Type Copper(Gold)Deposits in Chifeng,Inner Mongolia

The Mantougou Copper(gold)deposit, hosted by the sandstone-shale of upper Permian Linxi forma-tion,was explorated from 2007 to 2010 in Baliyouqi. Research shows that it is a typical sandstone(shale)-type copper(gold)deposit. The structure of the deposit is simple. Linxi Formation is a south-east direction monoclinic structure. The thickness of Linxi Formation greater than 600 meters, it has been found that the ore-bearing strata thickness is about 214.7 meters, which contain eight ore-layers. The orebody shows stratified, stratoid and lenticu-lar, and the ore minerals mainly is allotriomorphic-granular chalcopyrite and native gold, which all show a fine disseminated scattered sand shale, locally behold fine veins that formed after diagenesis. This formation generally contain pyrite.This discovery,which was first found in Inner Mongolia,not only guides the prospecting of man-tougou deposit,but also have important theoretical significance and directive function in finding similar ore de-posits in upper Permian.