繁昌—马鞍山地区重磁异常特征及找矿远景分析  

FEATURES OF GRAVITATIONAL AND MAGNETIC ANOMALIES AND ANALYSIS OF PROSPECTING PROSPECT IN THE FANCHANG-MA’ANSHAN AREA

作　　者：郭信[1] 兰学毅 严加永[2] 郭冬[1] GUO Xin;LAN Xue-yi;YAN Jia-yong;GUO Dong(Institute of Exploration Technology of Anhui Province,Hefei,Anhui 230031,China;China Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]安徽省勘查技术院,安徽合肥230031 [2]中国地质科学院,北京100037

出　　处：《安徽地质》2020年第2期119-123,138,共6页Geology of Anhui

基　　金：国家科技支撑计划项目专题(2011BAB04B01)资助。

摘　　要：繁昌—马鞍山地区具有良好的铁矿成矿地质条件。区内玢岩型铁矿、矽卡岩型铁矿控矿地层和岩体与围岩密度、磁性差异明显,重、磁资料能够较好的识别。本文基于研究区1∶5万重力测量成果,结合1∶5万航磁资料、岩石物性资料,从综合物探角度建立了本区构造格架,推断了研究区三叠系顶板埋深;通过重磁三维建模,揭示了研究区主要重磁异常体的三维结构和性质;根据典型矿床重磁异常特征,筛选出对找矿有利的重磁局部异常组合,圈定2处找矿远景区。The Fanchang-Ma’anshan area has good ore-forming geological conditions.The density and magnetism of ore-controlling strata and rock mass of porphyrite and skarn iron ore deposit are obviously different from those of surrounding rock,and the gravitational and magnetic data can be well identified.Based on 1∶50,000 gravity measurements in the study area,combined with 1∶50,000 aeromagnetic data and petrophysical property data,this paper established the structural framework of this area from the perspective of comprehensive geophysical exploration,and deduced the buried depth of the Triassic roof in the study area.The 3-d structure and properties of the main gravitational and magnetic anomalies in the study area are revealed through the 3-d modeling.According to the features of gravitational and magnetic anomalies of typical deposits,combinations of local anomalies of gravity and magnetism that are favorable for ore prospecting are screened out,and two prospective ore-prospecting areas are delineated.

关 键 词：繁昌—马鞍山地区 重力 远景区 

分 类 号：P631[天文地球—地质矿产勘探]