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

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 densi...

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Bibliographic Details
Published in:Acta geophysica 2016-10, Vol.64 (5), p.1257-1274
Main Authors: Yang, Wencai, Chen, Zhaoxi, Hou, Zunze, Yu, Changqing
Format: Article
Language:English
Subjects:
Central Asia
Data processing
Density
density disturbance
Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
lower-crust flows
multi-scale wavelet analysis
orocline
Structural Geology
Three dimensional imaging
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Summary: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.
ISSN:1895-6572
1895-7455
DOI:10.1515/acgeo-2015-0056