Three Dimensional Crustal Density Structure of Central Asia and its Geological Implications

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Acta Geophysica Pub Date : 2016-12-02 DOI:10.1515/acgeo-2015-0056
Wencai Yang, Zhaoxi Chen, Z. Hou, Changqing Yu
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引用次数: 1

Abstract

This paper introduces the scale-depth law of multi-scale wavelet analysis for regional gravity data processing, and presents the results of its application to Central Asia for computation of the 3D crustal density structures. The wavelet analysis method is applied for characterizing 3D crustal density structure, producing five maps of density disturbance corresponding to different depths of equivalent layers in the crust. The results provide important evidence for the study of crustal structures and mass movement in Central Asia: (i) the small-scale and intensive linear density disturbances in the upper crust indicate Phanerozoic orogenic belts; (ii) there exists a horseshoe-shaped low-density belt in the middle crust coinciding with the Kazakhstan orocline; (iii) there is a very low density zone in the lower crust, extending from western Kunlun to Tianshan, probably indicating a lower-crust flow; (iv) there are a few lowdensity spots in the middle crust, which might be caused by low-density mass squeezing upward from the lower crust flows.
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中亚三维地壳密度结构及其地质意义
本文介绍了多尺度小波分析在区域重力数据处理中的尺度-深度规律,并给出了其在中亚地区三维地壳密度结构计算中的应用结果。应用小波分析方法对三维地壳密度结构进行表征,得到了5张对应于地壳等效层不同深度的密度扰动图。研究结果为中亚地区地壳结构和物质运动研究提供了重要依据:(1)上地壳小尺度密集的线密度扰动指示显生宙造山带;(ii)与哈萨克斯坦造山斜重合的中地壳存在马蹄形低密度带;(3)下地壳有一个极低密度带,从西昆仑延伸到天山,可能是下地壳流动的标志;(4)中地壳存在少量低密度斑,这可能是由于低密度物质从下地壳流动中向上挤压所致。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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