康滇地区重力场分离、密度反演与地壳构造
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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.
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.
引文
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方剑.1997.青藏高原及其邻区岩石层三维密度结构[J].地球物理学报,40(5):660～666
冯锐.1985.中国地壳厚度及上地幔密度分布(三维重力反演结果)[J].地震学报,7(2):143～157
蒋福珍,方剑.1994.用重力方法研究青藏高原地体划分[J].地球物理学报,37(增刊2):131～138
康来迅.1991.中国南北地震带的基本特征及其形成机理之探讨[J].地壳形变与地震,11(4):76～85
马杏垣主编.1987.中国岩石圈动力学地图集[M].北京:地质出版社,1～68
刘晓华.1993.南北构造带中段的壳幔结构与岩石圈动力学特征[J].地壳形变与地震,13(3):25～32
滕吉文.1994.康滇构造带岩石圈物理与动力学[M].北京:科学出版社,1～256
王义昭,段锦荪,张罡,等.1998.滇西三江地区板块构造若干问题,全球构造带,超大陆的形成与裂解[A].见:曹佑功主编.第30届国际地质大会论文集第6卷[C].北京:地质出版社,84～90
杨文采编著.1988.后板块地球内部物理学导论[M].北京:地质出版社,99～105
许厚泽,高志忠,许尤楠,等.1981.关于1°×1°平均重力异常的计算[J].测量与地球物理集刊,3:81～95
BowinC.1983.Depth of principle mass anomalies contributing to the earth′s geoidal undulation and gravity anomalies[J].MarineGeodesy,7(1-4):61～100
ParkerR L.1972.The rapid calculation of potential anomalies[J].GeophysJ R astrSoc,31:447～455
OldenburgD W.1974.The immersion and interpretation of gravity anomalies[J].Geophysics,39:525～536
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