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Evolution of an Extensional Detachment Shear Zone: Microfabric, Kinematic and Rheological Study of the Shuiyu Ductile Shear Zone, Yunmeng Mountains, Beijing

Author: XiaHaoRan
Tutor: LiuJunLai
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: Yunmengshan metamorphic core complex Microstructural Crystallographic preferred Kinematic vorticity Rheology
CLC: P542
Type: Master's thesis
Year: 2011
Downloads: 117
Quote: 0
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Abstract


The Beijing Yunmengshan metamorphic core complex footwall rocks experienced pure shear accounts led to a simple shear dominated deformation under amphibolite facies to greenschist facies temperature and pressure environment in the Early Cretaceous . The fault vertical Hefang mouth , as the fault distance decreases , Yunmengshan granodiorite presents the transition from ductile deformation is gradually superimposed brittle deformation . Combination of microscopic structure feldspar subgrain rotation recrystallization , dynamically recrystallized quartz grain boundary migration , transition for feldspar superimposed bulging recrystallization , dynamic recrystallization of quartz subgrain rotation , to the rupture of feldspar , quartz subgrain rotation dynamic recrystallized final rupture, feldspar quartz recrystallized bulging . The shear deformation Yunmengshan granodiorite rocks British c-axis orientation of the measurement results taken from the Y-axis from the the Hefang mouth fault distance decreases , quartz crystallographic extremely dense and extremely dense form of cross- ring X-axis Y -axis fabric composed of asymmetric single strip to the Z -axis fabric , the reduction in the distance of the fault line with a relatively low temperature and high strain rate conditions play a more dominant role . Critical factor method of calculation results show that , the water shangpuzi profile and large Shuiyu profile kinematic vorticity concentrated oblique leaves hair cut on the Yunmengshan granodiorite 0.70 to 0.78 , 0.85 to 0.94 , indicating that the overall deformation general shear late deformation of simple shear push early deformation should be mainly for the pure shear . This may imply that extensional deformation in the early to experience the pure shear deformation on the gravity of the overlying rock , rock ; footwall rock uplift , the overlying rock is gradually reduced , the the simple shear ingredients gradually increase , and ultimately to the simple shear deformation based. By the ancient strain gauges and ancient thermometer , establish in crustal strength contour curves , brittle - ductile transition at the strength of 98.7 MPa , show that the late Mesozoic in North China has a relatively weak middle crust .

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CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Tectonic movement
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