都兰白石崖M20地区火山岩的地质地球物理特征(压缩修改稿).docVIP

都兰白石崖M20地区火山岩的 地质-地球物理特征 杨立功12，刘继顺12，尹利君12，刘卫明123，刘文恒12 （1.中南大学 有色金属成矿预测教育部重点实验室，长沙 410083；2.中南大学 地球科学与信息物理学院，长沙 410083；3.江西理工大学 资源与环境工程学院，江西 赣州 341000） 摘要：青海省都兰县白石崖地区铁多金属矿床，产于与火山机构有关的火成岩与石炭纪沉积岩的接触部位。因受第四系掩埋，整个地区的地质、地球化学、遥感特征不明显，只能依靠地球物理工作，查明隐伏火成岩及火山机构的分布状况，为资源勘查空间靶区的选定提供依据。针对区火成岩磁性弱、火山机构裂隙电阻率相对低的特点，本区投入了高精度磁法和高频大地电磁测深（Eh4）工作。经过对磁测数据的滤波、延拓、求导、小波分析、二级反演等方法的处理和电法卡尼亚电阻率Laplace及Salter行侦等突出异常体的变换，较好地划分了火山岩和火山机构的界限，确定了区内火山机构空间分布的地质--地球物理标志，并建立了区内理想状况下火山机构的地质--地球物理模型。 关键词： 火成岩 火山机构 高精度磁测 高频大地电磁测深 物探数据处理 中图分类号：P631 文献标识码：A 文章编号： The geological geophysical characteristics of the volcanic rocks in Baishiya M20 area ，Dulan，Qinghai YANG Li-gong12, LIU Ji-shun1,2, YIN Li-jun12 , LIU Wei-ming1,2,3 , LIU Wen-heng1,2, YU Huang-tao12 (1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University,Changsha 410083,China; 2.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China; 3.Faculty of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China.) Abstract: The iron polymetallic deposit in Baishiya, Dulan, Qinghai, is located within the contact zone between Carboniferous sedimentary rocks and igneous rocks, related to the volcanic edifice. As the igneous rocks are buried by the Quaternary diluvial and wind piled sands, the characteristics of geology, geochemistry, and remote sensing in the whole region is not obvious, and only relying on geophysical work can we identify the distribution of concealed igneous rocks quickly, which provides information for the target selection of resource exploration. Because of the low magnetisability of the igneous and low resistivity of the fractures in the volcanic-intrusive edifice in the study area, we did the surface sweeping by high precision magnetic method and measured several profiles by high-frequency magnetotelluric sounding(Eh4). After dealing with the geophysical data by several methods, su