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引用本文:陶龙,张莎莎,兰学毅,汤正江,安明,严加永,王云云,郭冬,叶林,洪大军. 1:5万重磁勘查在安徽宣城覆盖区地质找矿中的应用探索[J]. 中国地质, 2019, 46(4): 894-905.
TAO Long,ZHANG Shasha,LAN Xueyi,TANG Zhengjiang,AN Ming,YAN Jiayong,WANG Yunyun,GUO Dong,YE Lin,HONG Dajun. Application of 1: 50000 gravity and magnetic exploration for mineral prospect in heavily covered area in Xuancheng, Anhui Province[J]. Geology in China, 2019, 46(4): 894-905(in Chinese with English abstract).
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1:5万重磁勘查在安徽宣城覆盖区地质找矿中的应用探索
陶龙1, 张莎莎1, 兰学毅1, 汤正江1, 安明1, 严加永2, 王云云1, 郭冬1, 叶林1, 洪大军1
1.安徽省勘查技术院, 安徽 合肥 230031;2.中国地质调查局-中国地质科学院地球深部探测中心, 北京 100037
摘要:
安徽省宣城地区是长江中下游成矿带的重要组成部分,地表以第四系覆盖下(红层覆盖、推覆构造下)为主要特点。本文以最新获取的1:5万高精度重磁资料为基础,通过对研究区进行平面解译,获得了区内地质构造、控矿层位、侵入岩体的分布等平面属性;以研究区重磁二度半定量反演计算成果为基础,探索建立了全区准三维立体结构,掌握了区内主要控矿断裂、岩浆岩、矿源层等要素的几何空间展布规律及成矿有利部位等重要找矿空间属性;以研究区内已知典型矿床为切入点,总结了其地球物理场特征、成矿条件、控矿要素等成矿因素,探索构建了目标区地质-地球物理找矿模型,划分了成矿远景区,并圈定了重点找矿靶区。朱桥成矿远景区魏墩靶区钻探验证见矿实例表明,通过1:5万高精度重磁资料的处理与研究,进行位场平面—三维勘查、地质-地球物理找矿模型构建的方式发挥了地球物理找矿的优势,提高了找矿效果。本文研究成果可为中国东部覆盖区找矿勘查工作提供参考和指示。
关键词:  重磁勘查  覆盖区  三维勘查  地质-地球物理找矿模型
DOI:10.12029/gc20190418
分类号:P631.1
基金项目:中国地质调查局项目(1212011120924、1212011121009、DD20160082)、国家自然科学基金(41574133,41630320)及国家重点研发计划专项课题(2016YFC0600201)联合资助。
Application of 1: 50000 gravity and magnetic exploration for mineral prospect in heavily covered area in Xuancheng, Anhui Province
TAO Long1, ZHANG Shasha1, LAN Xueyi1, TANG Zhengjiang1, AN Ming1, YAN Jiayong2, WANG Yunyun1, GUO Dong1, YE Lin1, HONG Dajun1
1.Geological Exploration Technology Institute of Anhui Province, Hefei 230031, Anhui, China;2.Sinoprobe Center, Chinese Academy of Geological Sciences and China Geological Survey, Beijing 100037, China
Abstract:
Xuancheng area in Anhui Province is an important part of the metallogenic belt in the middle and lower reaches of the Yangtze River, with the surface characterized by Quaternary coverage, red bed coverage and nappe structure. Based on the newly acquired 1:50,000 high-precision gravity and magnetic data, the plane properties of the geological structure, ore-control horizon, and intrusive rock mass are obtained through the plane interpretation to the study area. Based on the magnetic second-degree and half-dimensional quantitative inversion results, we explored the three-dimensional structure of the whole area, and obtained the geometric spatial distribution rules of the main ore-controlling faults, magmatic rocks, and ore source layers. Also, we studied the spatial attributes of the favorable parts of metallogenesis. Starting from the known typical deposits in the study area, we summarized the mineralization factors of the geophysical characteristics, metallogenic conditions, and ore-controlling factors. We also explored the geological-geophysical prospecting model of the target area, divided the prospecting mineralization areas, and delineated the key prospecting target areas. The drilling to cores of Weidun target area in Zhuqiao Metallogenic Prospecting Area shows that, by processing the 1:50000 high-precision gravity and magnetic data, we implemented a way, including the potential field plane-threedimensional exploration and geological-geophysical prospecting model construction, in mineral exploration, which taked advantage of the geophysical prospecting and finally improved the exploration effect. The results in this study can provide references for prospecting and exploration works in eastern China.
Key words:  gravity and magnetic survey  heavily covered area  3D survey  geo-geophysical prospecting model