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Dynamic Analysis of Deformational Structures of the Xiannüshan Fault Zone in the Three Gorges of the Yangtze River
Author(s) -
Shuren WU,
Ganguo WU
Publication year - 1999
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1999.tb00823.x
Subject(s) - geology , fault (geology) , differential stress , yangtze river , three gorges , sinistral and dextral , kinematics , stress field , stratification (seeds) , seismology , deformation (meteorology) , geomorphology , geotechnical engineering , geography , structural engineering , oceanography , archaeology , china , engineering , biology , germination , classical mechanics , seed dormancy , physics , botany , finite element method , dormancy
Field investigation and laboratory work reveal that inhomogeneity of the deformation of the Xiannüshan fault is mainly characterized by lateral zonation, longitudinal segmentation and downward stratification. Based on these results, a 3‐D deformational structure model of the fault was established and its geometrical and kinematic characteristics in two main deformational stages i.e. the main Yanshanian and Himalayan were discussed. The directions of principal and the differential stresses in these two stages were determined by using conjugate joints, striations of fault planes and microstructures of the fault zone. The direction of s̀1 is N‐S in direction with differential stresses of 150–250 MPa in the Yanshanian, and N70E with a differential stress ranging from 80–120 MPa in the Himalayan.