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Multi-Scale Scratch Analysis in Qinghai-Tibet Plateau and its Geological Implications

机译：青藏高原的多尺度划痕分析及其地质意义

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摘要

Multi-scale scratch analysis on a regional gravity field is a new data processing system for depicting three-dimensional density structures and tectonic features. It comprises four modules including the spectral analysis of potential fields, multi-scale wavelet analysis, density distribution inversion, and scratch analysis. The multi-scale scratch analysis method was applied to regional gravity data to extract information about the deformation belts in the Qinghai-Tibet Plateau, which can help reveal variations of the deformation belts and plane distribution features from the upper crust to the lower crust, provide evidence for the study of three-dimensional crustal structures, and define distribution of deformation belts and mass movement. Results show the variation of deformation belts from the upper crust to the lower crust. The deformation belts vary from dense and thin in the upper crust to coarse and thick in the lower crust, demonstrating that vertical distribution of deformation belts resembles a tree with a coarse and thick trunk in the lower part and dense and thin branches at the top. The dense and thin deformation areas in the upper crust correspond to crustal shortening areas, while the thick and continuous deformation belts in the lower crust indicate the structural framework of the plateau. Additionally, the lower crustal deformation belts recognized by the multi-scale scratch analysis coincide approximately with the crustal deformation belts recognized using single-scale scratch analysis. However, deformation belts recognized by the latter are somewhat rough while multi-scale scratch analysis can provide more detailed and accurate results.
机译：区域重力场的多尺度划痕分析是一种用于描述三维密度结构和构造特征的新型数据处理系统。它包括四个模块，包括势场的频谱分析，多尺度小波分析，密度分布反演和划痕分析。将多尺度划痕分析方法应用于区域重力数据，以提取青藏高原变形带的信息，这有助于揭示变形带的变化和平面分布特征，从上地壳到下地壳，提供研究三维地壳结构的证据，并定义变形带的分布和质量运动。结果表明变形带从上地壳到下地壳的变化。变形带的变化范围从上地壳的致密稀疏到下地壳的粗致稀疏，这说明变形带的垂直分布类似于一棵树，其下部具有粗大且粗大的树干，顶部具有致密而细小的树枝。上地壳中的致密和薄形变形区对应于地壳缩短区，下地壳中的厚而连续的形变带表示高原的结构框架。另外，通过多尺度划痕分析识别的下部地壳形变带与通过单尺度划痕分析识别的地壳形变带大致重合。但是，后者所识别的变形带有些粗糙，而多尺度划痕分析可以提供更详细和准确的结果。

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