青藏高原地壳三维密度结构的重力反演
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摘要
在阻尼最小二乘法的基础上,提出了利用重力进行三维密度反演的选权拟合法,并利用密度分布的特点构造了约束权矩阵.为了改善单一重力反演的非唯一性,利用地震面波层析成像资料进行约束,得到了青藏高原不同深度高分辨率三维密度异常分布图.反演结果显示,青藏高原地壳内密度很不均匀,不同块体具有不同的密度异常特征,拉萨和羌塘地体为低的负密度异常区,松潘一甘孜地体东部存在较低的负密度异常区,塔里木盆地存在较高的正密度异常区.从中部到东部,上地壳物质存在差异,而下地壳物质存在一定连续性.
The fitting method by selection of the parameter weights is put forward for three-dimensional density inversion with gravity data based on the damping least squares,and the constraint weights matrix is constructed according to the characteristic of density distribution.In order to improve the uniqueness of the gravity inversion,the results from the seimic tomagraphy are used for constraint,and the distribation of density anomolies with a high resolution is inverted at different depths of the Tibetan plateau.The inversion results show that,the density of crust in the Tibetan plateau is inhomogeneous,and the characteristic of density contrast are different between terranes.The Lhasa and Qiangtang terranes belong to the area of low and negative density anomalies,the east part of Songpan-Ganzi terrane has the lower negative density anomalies,and the Tarim basin has the higher positive density anomalies.From the middle to the east,the material in upper crust has diversity,but that in lower crust has continuity.
The fitting method by selection of the parameter weights is put forward for three-dimensional density inversion with gravity data based on the damping least squares,and the constraint weights matrix is constructed according to the characteristic of density distribution.In order to improve the uniqueness of the gravity inversion,the results from the seimic tomagraphy are used for constraint,and the distribation of density anomolies with a high resolution is inverted at different depths of the Tibetan plateau.The inversion results show that,the density of crust in the Tibetan plateau is inhomogeneous,and the characteristic of density contrast are different between terranes.The Lhasa and Qiangtang terranes belong to the area of low and negative density anomalies,the east part of Songpan-Ganzi terrane has the lower negative density anomalies,and the Tarim basin has the higher positive density anomalies.From the middle to the east,the material in upper crust has diversity,but that in lower crust has continuity.
引文
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[22] Zhang Z J,Li Y K,Wang G J,et al.East-west crustal structure and "down-bowing" Moho under the northern Tibet revealed by wide-angle seismic profile[J].Science in China (Series D) ,2002,45(6) : 550-558．
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