Genetic Types and Geological Significances of Transverse Faults at Longmenshan Fault Zone
Wang Weifeng
Zhu Chuanhua
Zhang Xiaojie
Qing Yanbin
Shan Xinjian
Abstract：Study on transverse faults in the Longmenshan fault zone is inadequate so far.Based on the regional geology,gravity data,magnetic data,distribution of earthquake and velocity data,combined with field study and structural modeling,the ge-netic types and geological significances of transverse faults at the Longmenshan fault zone were studied.It is found that:(1 ) There are 6 transverse faults in the northern and central Longmenshan fault zone,namely,the Bailongjiang,Nanba,Huya, Qingping,Xiaoyudong and Wolong-Huaiyuan transverse faults,where Huya fault is the boundary between the northern and central Longmenshan fault zones,while the Wolong-Huaiyuan fault is between the southern and central Longmenshan fault zone;(2)Transverse faults mainly have three genetic types,they are the transfer faults resulted from the reaction of the pre-existing NW-trending faults or weak belts and the nonsynchronous movement of the thrust faults,X-type conjugate shear faults and transverse extensional faults;(3)Transverse faults cut the Longmenshan fault zone into several segments and transfer the differences of the stratum,the geomorphology,the movement intensity,width of the thrust belts,earthquake intensity and frequency of different segments,besides,transverse faults could be independent seismogenic faults which may trigger earth-quakes with the Longmenshan major fault belts and restrict the spread of aftershocks.
Keywords：Longmenshan fault zonetransverse fault typecharacteristics of transverse faultformation mechanismtectonics
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 729-741 )