重磁资料在厚覆盖区隐伏岩体勘查中的应用--以西贾庄金多金属矿外围地区推测隐伏岩体为例  

APPLICATION OF GRAVITY AND MAGNETIC DATA IN PROGNOSIS OF CONCEALED ROCK MASS IN THICK OVERBURDEN AREA——A CASE STUDY OF PROSPECTING HIDDEN ROCK MASS IN THE PERIPHERY OF THE XIJIAZHUANG GOLD POLYMETALLIC DEPOSIT

作　　者：黄寄洲 盛勇[1] 张磊[1] 李仁和[1] HUANG Ji-zhou;SHENG Yong;ZHANG Lei;LI Ren-he(Institute of Geophysical and Geochemical Survey Technology of Anhui Province,Hefei,Anhui 230022,China)

机构地区：[1]安徽省地球物理地球化学勘查技术院,安徽合肥230022

出　　处：《安徽地质》2020年第3期186-189,198,共5页Geology of Anhui

基　　金：安徽省公益性地质项目“安徽省蒙城县西贾庄—罗集地区铁矿预查”(2008-Ⅲ-3)。

摘　　要：近年发现的西贾庄金多金属矿是蚌埠隆起西段厚覆盖区唯一的一个金多金属矿床,研究表明,该金多金属矿与中酸性岩体成矿关系密切。文章基于地质背景与物性资料,结合已有钻孔资料,对矿床及其外围地区的重磁异常进行了详细分析,初步总结了已揭露的中酸性岩体的重磁异常特征,根据从已知到未知的原则,推测了两处隐伏中酸性岩体,并通过2.5D重磁反演,进一步认识了岩体的空间分布形态。通过对比西贾庄金多金属矿床,研究认为在推测的隐伏岩体及其与围岩的接触带上具有较好的找矿前景,为今后该区金多金属矿的勘查方向提供了地球物理依据。The Xijiazhang gold polymetallic deposit is the only one of its kind discovered in recent years in the thick overburden area of the western section of the Bengbu uplift.Study shows that the gold polymetallic ore deposit is closely related to the mineralization of intermediate-acid rock mass.Based on geological setting and physical property data,combined with the existing drilling data,the gravity and magnetic anomalies in the periphery of the deposit are analyzed in detail,the features of gravity and magnetic anomalies in known intermediate-acid rock masses are summarized,according to the rule of“from the known to the unknown”,two concealed intermediate-acid rock masses are inferred,and their spatial distribution is further understood by 2.5 D gravity and magnetic inversion.Through comparison with the Xijiazhuang gold polymetallic deposit,it is concluded that there is a good prospect in mineral exploration in the inferred concealed rock mass and its contact with the wall rock,which provides a geophysical basis for prospecting gold polymetallic ore deposit in this area in the future.

关 键 词：重磁资料 覆盖区 隐伏岩体 西贾庄金多金属矿 

分 类 号：P631[天文地球—地质矿产勘探]