甘肃省肃南县镜铁山黑沟铁矿床地质特征及找矿方向  

GEOLOGICLA CHARACTERISTICS AND PROSPECTING POTENTIAL OF HEIGOU IRON DEPOIST IN JINGTIESHAN OF SUNAN YUGUR AUTONOMOUS COUNTY,GANSU PROVINCE

作　　者：黄登鹏 张延东 柴宏伟 蒲万峰 HUANG Deng-peng;ZHANG Yan-dong;CHAI Hong-wei;PU Wan-feng(Engineering Technology Research Center for Exploration and Comprehensive Utilization of Metal and Precious Metal Mineral Resources of Gansu Province,The Third Institute of Geology and Mineral Exploration,Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou 730050,China;Gansu Jingtieshan Mining Co.,Ltd.,Zhangye 734400,China)

机构地区：[1]甘肃省金属贵金属矿产资源勘查与综合利用工程技术研究中心,甘肃省地矿局第三地勘院,甘肃兰州730050 [2]甘肃镜铁山矿业有限公司,甘肃张掖734400

出　　处：《甘肃地质》2023年第2期15-21,共7页Gansu Geology

基　　金：甘肃省科技计划(22YF7GA050);中央引导地方科技发展资金项目(YDZX20216200001297);陇原青年人才项目(2020RCXM152);甘肃酒泉钢铁集团公司2021年度科技项目(4500689978)联合资助。

摘　　要：黑沟铁矿床位于甘肃省肃南县镜铁山一带,地处祁连山褶皱系北部,北与阿拉善地块和阿拉善南缘加里东褶皱带相接,南与中祁连隆起带毗邻,是我国西北地区规模最大的镜铁山铁矿的第二大矿区,属沉积变质型铁矿床。铁矿体赋存于中元古界长城系朱龙关群桦树沟组第七岩性段中,因受褶皱构造的影响而呈向斜构造形态。根据近年来黑沟铁矿床的勘查成果,结合区域地质背景和矿床地质特征,认为该区域与沉积变质型铁矿相关的找矿标志为地层标志、构造标志、岩石蚀变标志。通过对黑沟铁矿床地质特征和找矿标志的研究,为镜铁山周边区域同类型铁矿的找矿方向提供指导意义。Situated in Sunan Yugur Autonomous County,Gansu Province,China,Heigou iron deposit is the second largest deposit of Jingtieshan iron mine which is the largest mine in northwest China.As a sedimentary metamorphic iron deposit,Heigou iron deposit is located in the north of Qilian fold system,adjacent to the southern Alxa Block and the Caledonian fold belt in the north and the central Qilian uplift in the south.The deposit occurs in the 7th lithologic section of Birch Gou Formation of Zhulongguan Group of Great Wall System of the Mesoproterozoic Era.Its form has a primitive sedimentary one,which is oblique due to the influence of fold structure.Mixing the prospecting results of Heigou iron deposit in recent years,regional geological background and geological characteristics of the deposit,this paper holds that prospecting marks relevant to sedimentary metamorphic iron deposit in this area include stratigraphic marking(7th lithologic member of Huashugou Formation,Changcheng System),geological structure marking(closed secondary syncline structure in the fold belt within the region),rock alteration markings(siderite and pyrite mineralization,sericitization,dolomitization,chloritization and fading).The study on geological characteristics and prospecting marks of Heigou iron deposit provides guidance for prospecting potential of the same type of iron deposit in the surrounding area of Jingtieshan.

关 键 词：甘肃省 镜铁山 黑沟铁矿床 地质特征 找矿方向 

分 类 号：P618.42[天文地球—矿床学]