| 中国西部布格重力异常特征和地壳密度结构 |
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| 引用本文：彭聪.2005.中国西部布格重力异常特征和地壳密度结构[J].地球学报,26(5):417-422. |
| DOI：10.3975/cagsb.2005.05.04 |
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| 基金项目:国土资源部“重点区段岩石圈三维结构及其演化” |
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| 中文摘要:本文是以地学断面、反射／折射地震和宽频地震资料为地壳密度模型初始约束条件，沿西藏噶尔—新疆布尔津、西藏亚东—内蒙古额济纳旗、新疆阿尔泰—四川成都等3条剖面做布格重力异常反演计算，模拟出中国西部地壳密度结构。中国西部地壳密度结构特征在南北方向存在巨大差异。以西昆仑一阿尔金一祁连山近EW向重力梯度带为界，地壳密度结构可分为南北两个大的密度结构单元，南部地壳密度结构特征为低密度、厚地壳；北部地壳密度结构特征为高密度、薄地壳；中国西部地壳处于地壳均衡状态。地壳上地幔密度不均匀性特征在纵向和横向上都是很明显的。青藏高原内部软流圈具有低密度特征，低密度软流圈产生向上的浮力是青藏高原重要的隆升机制之一。 |
| 中文关键词:布格重力异常 密度结构 地壳 中国西部 |
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| Bouguer Anomalies and Crustal Density Structure in Western China |
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| Abstract:With the restriction of reflection/refraction and for the purpose of simulating the crustal density structure in western China, this paper has conducted Bouguer gravity anomaly inversion simulation along the following 3 profiles: Gaer (Tibet)-Buerjin (Xinjiang), Yadong (Tibet)-Golmud (Qinghai)-Erjinaqi (Inner Mongolia) and Altay (Xinjiang)-Chengdu (Sichuan). The crustal density structures are divided into 2 parts. The crustal thickness in the south is larger than that in the north, but the density in the south is lower. The crust in western China is in the state of isostasy. In the crust and upper mantle, the density is characterized by lateral and vertical heterogeneity. The asthenosphere is of low density in Tibet, and the upward buoyancy it caused seems to be one of the uplift mechanisms in Tibet plateau. |
| keywords:Bouguer gravity anomaly density structure crust western China |
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