安徽宣城矿集区控矿构造特征及其深部找矿指示意义  

Characteristics of ore-controlling structures and their implications for deep ore prospecting in the Xuancheng ore concentration area, Anhui

作　　者：胡召齐[1,3] 杜建国 谢祖军[2] 陈忠良 马涛[1,3] 李振伟 HU Zhaoqi;DU Jianguo;XIE Zujun;CHEN Zhongliang;MA Tao;LI Zhenwei(Geological Survey of Anhui Province(Institute of Geological Sciences of Anhui Province),Hefei,Anhui 230001,China;No.322 Unit,Bureau of Geology and Mineral Exploration of Anhui Province,Maanshan,Anhui 243000,China;Technological Innovation Center for Exploration Engineering of Deep Resources in Overburden Area,MNR,Hefei,Anhui 230001,China)

机构地区：[1]安徽省地质调查院(安徽省地质科学研究所),安徽合肥230001 [2]安徽省地质矿产勘查局322地质队,安徽马鞍山243000 [3]自然资源部覆盖区深部资源勘查工程技术创新中心,安徽合肥230001

出　　处：《安徽地质》2024年第2期97-100,119,共5页Geology of Anhui

基　　金：中国地质调查局发展研究中心课题“安徽省宣城矿集区深部找矿预测”(编号:DD2019057004);安徽省公益性地质工作项目“1∶50000洪镇(H50 E 009012);安庆市幅(H50 E 009013)深部矿产地质调查”(编号:2023-g-1-3);国家自然科学基金项目“数据驱动与相似度推理知识嵌入的可扩展岩石图像识别研究”(编号:42372342)联合资助。

摘　　要：宣城矿集区因近年发现了茶亭斑岩型铜金矿、长山热液型铅锌矿等大-中型矿产地而成为长江中下游成矿带较热门矿集区之一。通过详细的野外调查和系统分析,本文厘定了研究区北东向构造格架为一条深大断裂带、两个坳陷盆地、三条逆冲推覆构造带,其中推覆构造带由多个自南东向北西运动的倒转复式褶皱和叠瓦状逆冲岩席组成。根据典型矿床控矿构造解析,明确了江南深大断裂和深部主推覆构造是区内一级控岩控矿构造,北东向断裂带及其次级构造、推覆体上盘倒转褶皱转折端和翼部、层间破碎带、五通组与黄龙-船山组的“硅钙面”、燕山晚期中酸性侵入岩与碳酸盐岩的接触带等为区内重要的控矿、容矿构造,并据此提出了该区下一步深部找矿方向。The Xuancheng ore concentration area is becoming one of the hottest spots in the metallogenic belt along the middle-lower Yangzte River reaches for the discovery of several large-and medium-sized ore deposits such as the Chating porphyry Cu-Au deposit and Changshan hydrothermal type Pb-Zn deposit.Based on detailed field observation and systematical analysis,aNE-trending tectonic framework in the study area has been identified,which includes a major deep fault zone,two depression basins,and three thrust-nappe structural belts composed of multiple overturned complex folds and imbricated thrust sheets moving from SE to NW.According to comprehensive analysis of typical ore deposits,it is concluded that the Jiangnan major deep fault zone and the deep-seated main nappe structure are the primary rock-and ore-controlling structures in the area.Other major ore-controlling and hosting structures are the NE-trending fault and its secondary structures,the limbs and hinge zone of the overturned anticline in the hanging wall of the nappe,interlayer fracture zone,the silicon-calcium interface between the Devonian Wutong Formation and the Carboniferous Huanglong-Chuanshan Formation,and the contact zone between the Late Yanshannian intermediate-acid felsic intrusion and the carbonate rocks.Some suggestions are thus given for further prospecting into the deep part of the area.

关 键 词：宣城矿集区 逆冲推覆构造 控矿构造 铜金多金属矿 深部找矿 

分 类 号：P548[天文地球—构造地质学] P613[天文地球—地质学]