西藏罗布莎地区重磁场特征与地质解释  

Gravity and magnetic field characteristics and geological interpretation in the Luobusha area, Tibet

作　　者：刘良志 路利春 姜鸿 李陇锋 王龙龙 李冰 王鹏 陶青华 LIU Liang-zhi1, LU Li-chun2, JIANG Hong3, LI Long-feng4, WANG Long-long5, LI Bing5, WANG Peng2, TAO Qing-hua2(1. Geophysical Exploration Department of Hunan Non Ferrous Geological Research Institute, Changsha 410000, China; 2. The NO.2 Comprehensive Geophysical Prospecting Brigade Shaanxi Geological Mining, GEC, Xi＇an 710016, China; 3.Shaanxi Hanzhong Brigade of Geology and Mineral Resources, Hanzhong Shanxi 723000, China; 4.Second Institute Geological and Mineral Exploration Gansu provincial Bureau oF Geology and Mineral Rosources, Lanzhou 730022, China; 5.Shaanxi Geology and Mining Geophysical and Geoehemical Prospecting Team C.,Tld, Xi＇an 710043, China)

机构地区：[1]湖南省有色地质勘查研究院地球物理勘查分院,长沙410000 [2]陕西地矿第二综合物探大队有限公司重力探测综合研究中心,西安710016 [3]陕西地矿汉中地质大队有限公司,陕西汉中723000 [4]甘肃省地矿局第二地质矿产勘查院,兰州730022 [5]陕西地矿物化探队有限公司,西安710043

出　　处：《地质调查与研究》2018年第3期204-212,共9页Geological Survey and Research

基　　金：国家地质调查项目"冈底斯成矿带地质矿产调查(1212011221069)"

摘　　要：根据不同地层、不同岩(矿)石密度、磁性差异,结合地质、钻孔资料,分析了西藏罗布莎地区的重磁场分布特征;利用重磁场图件,结合物化探、地质钻孔、遥感解译等资料推断出48处隐伏岩体,并分别作了相应解释,预测其中19处隐伏岩体为成矿潜力区块。选取3个重点成矿区重磁异常剖面进行了2.5D反演拟合解释。总结了罗布莎地区重磁异常与隐伏岩体的空间分布特征及其成因,为成矿远景区划分提供依据,为深部地质找矿提供了地球物理资料。Based on the characteristics of gravity and magnetic anomalies in the Luobusa area of Tibet, using different strata and different rock （mineral） density and magnetic difference, combining with geology and drilling data, we analyzed the characteristics of heavy magnetic field distribution in this area. And using gravity and magnetic maps, combined with materialization exploration, geological drilling, remote sensing interpretation and other data inferred 48 hidden rock masses and made corresponding explanations respectively. The distribution of concealed rock masses was analyzed, and 19 concealed rock masses were predicted as mineralization potential blocks. We selected the gravity and magnetic anomaly profiles of the three key metallogenic regions to perform 2.5D inversion and fitting explanations, summarizing the spatial distribution characteristics of the gravity and magnetic anomalies and hidden rock mass in the Lobusha area and their causes, providing a basis for the division of the metallogenic prospective area, and deep geological prospecting basic geophysical data.

关 键 词：物性特征 重力异常 磁异常 地质解释 25D重磁反演 

分 类 号：P631[天文地球—地质矿产勘探]