康滇地区重力场分离、密度反演与地壳构造  

GRAVITY FIELD SEPARATION, DENSITY INVERSION AND CRUSTAL TECTONICS IN KANG-DIAN REGION

作　　者：蒋福珍[1] 方剑[1] 

机构地区：[1]中国科学院测量与地球物理研究所,中国武汉430077

出　　处：《地震学报》2001年第4期391-397,共7页Acta Seismologica Sinica

基　　金：国家自然科学基金 (4 98740 0 5 );中科院重点项目(KZCX2 -1 0 6; KZ95 2 -J1 -41 7)资助

摘　　要：康滇地区位于我国著名的南北向活动构造带的南端 ,是中蒙经向中轴强地震带和巨大的地壳厚度变化带的一部分 .由于该地区是地震活动的预测危险区 ,且资源非常丰富 ,引起了广大地学工作者的关注 .本文采用对地壳内部密度分布最为敏感的重力场资料进行场分离、平差、反演等数学处理 ,求出地壳平均密度和深度 1 0～ 1 0 0 km各层的密度分布 ;综合其它地球物理资料进行分析 .结果表明 ,康滇菱形块体与其东侧和西侧不论在构造特征还是地球物理场特征方面皆存在差异 .Kangdan region is located on the southern part of the famous North South active tectonic belts, which is a part of China Mongolia central axis strong earthquake belt and the huge crustal thickness undulate belt. Many geologists interest in it due to its earthquake activity and plenty of ore deposited. We inverted mean crustal density and density anomalies on the different layer in the depth range of 10~100 km, using the gravity field that is treated by separation and adjustment. Combining other geophysical data to analyses the density data, the results show that there is difference both in tectonic feature and geophysical feature between Kangdian diamond block and its west and east parts.

关 键 词：重力异常 密度分布 位场反演 地壳构造 康滇地区 活动构造带 地震活动 

分 类 号：P315.2[天文地球—地震学] P542[天文地球—固体地球物理学]