Structural Analysis for Qazzaz Metamorphic Core Complex,Northwestern Arabian Shield,Saudi Arabia  

作　　者：Mansour H.AL-HASHIM Osama M.K.KASSEM 

机构地区：[1]Department of Geology and Geophysics,College of Science,King Saud University,11451 Riyadh,Saudi Arabia [2]Department of Geology,National Research Center,Cairo,Egypt

出　　处：《Acta Geologica Sinica(English Edition)》2024年第5期1187-1201,共15页地质学报（英文版）

基　　金：supported and funded by the Researchers Supporting Project(Project No.RSPD2024R781),King Saud University,Riyadh,Saudi Arabia。

摘　　要：Identifying deformational mechanisms and associated structures at various scales,ranging from regional-scale structures to microscopic fabric,is crucial for the assessment of tectonic development.Thirty-three samples were taken from the Qazzaz metamorphic core complex to estimate the finite strain for felsic and mafic minerals.These samples included gneisses rocks,monzogranite,and metavolcano-sedimentary rocks for both the Thalbah and Bayda groups.Using the Rf/j and Fry methods,the axial ratios(XZ)range about 2.20 to 7.10 and 1.90 to 9.10,respectively.For various rock units,the strain measurements show moderate to highly deformation.Most of the observed samples show shallow WNW dipping along a N to WNW trend of finite strain(X).The short axes(Z)based to be subvertical foliation related with a subhorizontal foliation.The results demonstrate that contacts generated at semi-brittle to ductile deformation and that the strain of magnitude has the same value for different lithologic units.It concluded that nappe generation in orogens results from pure shear deformation.

关 键 词：Finite strain metamorphic core complex Qazzaz area Saudi Arabia 

分 类 号：P587[天文地球—岩石学]