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金属矿山 ›› 2020, Vol. 49 ›› Issue (07): 130-137.

• 地质与测量 • 上一篇    下一篇

河南省大古石沟地区地质特征及铅锌矿找矿方向

张恺,毛瑞芬,李琛,范晓磊   

  1. 1. 河南省地质矿产勘查开发局第二地质勘察院,河南 郑州 450000;2. 河南省地质调查院,河南 郑州 450001;3. 河南省金属矿产成矿地质过程与资源利用重点实验室,河南 郑州 450001
  • 出版日期:2020-07-15 发布日期:2020-08-21
  • 基金资助:
    中国地质调查局矿产地质调查项目(编号:1212011120776)

Geological Characteristics and Prospecting Direction of Pb-Zn Deposit of Dagushigou Area in Henan Province

Zhang Kai,Mao Ruifen,Li Chen,Fan Xiaolei   

  1. 1. The No.2 Geological and Mineral Resources Exploration Institute,Henan Bureau of Geology and Mineral Resources Exploration,Zhengzhou 450000,China; 2. Henan Insititute of Geological Survey,Zhengzhou 450001,China;3. Henan Key Laboratory of Ore Forming Process and Resources Utilization of Metal Minerals,Zhengzhou 450001,China
  • Online:2020-07-15 Published:2020-08-21

摘要: 为查明太行山东麓铁铜铅锌等多金属矿成矿带的成矿地质条件,在大古石沟地区相继开展了1∶50 000矿产地质调查、1∶50 000水系沉积物测量、1∶50 000高精度磁法测量和1∶50 000电法测量工作。在圈定物化探异常和矿化有利地段的基础上,利用1∶10 000地质草测、1∶10 000地物化探综合剖面测量和槽探工程等,开展了系统的矿产调查分析。综合研究表明:①大古石沟铅锌矿赋存于中寒武统张夏组和上寒武统三山子组碳酸盐岩地层中,是一种碳酸盐岩容矿的低温热液型矿床,属层控矿床,具有密西西比河谷型(Mississippi Valley Type,MVT)矿床特征;②矿体主要有2种形态,一种呈脉状、透镜状、囊肿状赋存于NNE向、NWW向断裂带中,一种呈层状、似层状、不规则状、透镜状、窝状等赋存于近水平的层间顺层破碎带中,角砾岩化、白云岩化共同构成了铅锌矿床围岩蚀变的主要形式;③地表共发现了铁、铜、铅锌矿(化)脉31条(层),其中,具有价值的铜铅锌多金属矿化体3条、含铅重晶石脉3条,初步圈定了2条工业矿体,富矿体延伸长度可达2 000 m以上,矿体总厚度达10~12 m,Pb品位高达3.9%~10.26%,矿体远景资源量可达中小型矿床规模。在上述分析的基础上,根据矿区地质特征、物化探特征及含矿特征,初步划分了大古石沟、小东沟和普泉等3个有利的成矿区段,具有较好的找矿潜力。可见,采用地质调查、物化探扫面、大比例尺地质填图及物化探综合剖面测量、槽探揭露等方法,具有良好的找矿效果。

关键词: 铅锌矿, 层控矿床, 层间破碎带, 密西西河谷型(MVT), 找矿方向

Abstract: In order to clearly understand the metallogenic conditions of East Taihang Mountains Fe-Cu-Pb-Zn polymetallic ore belt,plenty of works have been conducted,such as 1∶50 000 mineral resources investigation,1∶50 000 stream sediments survey,1∶50 000 high-resolution magnetic survey and 1∶50 000 electric survey.Based on delineating of geophysical-geochemical anomaly areas and some potential areas,1∶10 000 geological grass survey,1∶10 000 geological-geophysical-geochemical comprehensive profile survey and trench engineering are adopted to carry out the mineral reources investigation.Comprehensive study results show that:①Dagushigou Pb-Zn Deposit is a type of carbonatite-hosted low temperature geothermal deposit and a typical stratabound deposit occurred in Middle Cambrian Zhangxia Formation and Upper Cambrian Sanshanzi carbonatite sequence,which is similar with Mississippi valley type (MVT) deposit;② there are two types of ore-bodies,one type appears as veins,lenticulars and cysts in NNE,NWW trending fault zones,the other type appears as stratum,stratiform,irregular and lenticulars in near-horizontal interlaminar bedding fracture zones,brecciation and dolomitization are the main wall-rock alterations;③31 ore veins were found in the study area in total,which contain 3 Cu-Pb-Zn polymetallic mineralized ore bodies and 3 lead-bearing barite veins are valuable,two industrial ore bodies have been preliminarily delineated,the rich ore bodies extend more than 2 000 m with total thickness of 10~12 m and lead grade from 3.9% to 10.26%,the ore bodies prospective resources could reach small to medium scale.Based on the above study results,according to the geological-geophysical-geochemical and ore-bearing characteristics of the study area,three favorable areas for metallogenic are delineated,they are named as Dagushigou,Xiaodonggou and Puquan,which have good metallogenic potential.The above study results further indicated that good prospecting effects can be obtained by the integrated method of geological investigation,geophysical and geochemical sweep, large scal geological survey,geophysical-geochemical integrated profile measurement and trenching reveling.

Key words: Pb-Zn deposit, Stratabound deposit, Interlayered fracture zone, Mississippi valley type (MVT), Prospecting direction