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《Chinese Journal of Geophysics》 2015-01
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Gravity anomalies and the distributions of inhomogeneous masses in the crust of Mongolia and its surrounding regions

CHEN Shi;WANG Qian-Shen;Institute of Geophysics,China Earthquake Administration;Institute of Geology and Geophysics,Chinese Academy of Sciences;  
The Mongolia arc structural belt has a complicated formation and development history.It is an important boundary that affect the internal tectonic deformation and evolution of China mainland.From the gravity anomalies to study the crustal deformation patterns,to further reveal the continental crust and lithospheric mantle deformation characteristics in the northern part of China,has an important geological and geophysical significance.In order to study the density structures of sources at different depths,we need to separate the gravity anomalies and understand tectonic deformation patterns from the field sources of different depths.First,on the basis of the EGM2008 model,we have the free air gravity anomalies,using the gravity correction approach,calculated Bouguer and Airy gravity anomalies in the Mongolia and its surrounding areas.Then,introduce the Crust 1.0crustal model,and establish the reference density model from the surface to the 55 km depth in Mongolia and its surrounding areas.Finally,we extract 6profiles and determine the hierarchical gravity anomalies in each profile,and make the quantitative analysis on gravity anomaly features of the crustlithospheric mantle density field source bodies of in Mongolia and its surrounding areas.On the basis of above data and methods,our results include:(1)The gravity anomaly models in Mongolia and its surrounding areas indicate the obvious differences of tectonic deformation between the Hangai dome and Altay Mountains in the western region.There is no area with apparent high-value isostatic gravity anomalies in the Hangai dome.But the high-value regions are concentrated in the southwest of the Altay Mountains.We infer that this feature is related to the new tectonic movement.(2)Based on the reference crustal density model by Crust1.0,we have investigated the distributions of lateral inhomogeneous bodies in the crust and upper mantle,and find the lateral density structure is important to forward modeling of the gravityanomalies caused by the Moho relief.(3)We have the comprehensive profiles with density structure from the Crust 1.0 model.The results indicate that the density feature is consistent with deep crustal deformation and structures of large active faults.From the analysis of the hierarchical gravity anomalies and the reference density models,we suggest a dynamic model that accounts for the deep crustal movement from west to east in Mongolia,in which the force source is not from the squeeze process between the Siberian plate and Eurasian plate,rather related to the northeastward movement of the block in the southwestern Altay Mountains.The formation of strike-slip faults in both north and south of the Hangai Dome is also related to this movement.The deformed interface determined by the Crust1.0model is consistent with the distribution of surface ruptures.There is the correlation between the topography and deep deformation,which consists with the isostatic hypothesis.Therefore,it is a feasible approach to improve gravity inversion using Bouguer gravity anomalies based on the lateral inhomogeneous density model in regions with complex structures.Our results also indicate that the consistency between deep and shallow mass distribution and deformation in the arc-like tectonic deformation zone of Mongolia.
【Fund】: 科技部国际合作重点项目“远东地区地磁场、重力场及深部构造观测与模型研究”(2011DFB20210);; 中国地震局地球物理研究所基本科研业务专项(DQJB12C03);; 国家地震科技支撑计划项目(2012BAK19B01-05);; 国家自然科学基金青年基金项目(41104046)联合资助
【CateGory Index】: P312
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