Deformation Analyses and Their Geological Implications of Carboniferous-Permian Tectonic Transformation Period in Northwest Margin of Junggar Basin
Yan Wenbo
Wang Guocan
Li Li
Zhang Lei
Yu Junjian
Yang Gang
Chen Xujun
Abstract：Detailed deformation analyses of the Zaire-Hala'alate Mountains show the following three different directional trends of regional structural features developed in the northwest margin of the Junggar basin:the south-north (S-N),northeast to southwest (NE-SW)and east-west (E-W)directions.The deformation sequences demonstrate that nearly S-N fold-thrust structures were developed during the early Late Carboniferous.During the late Late Carboniferous,nearly S-N tectonic orienta-tion was transformed into the NE-SW direction by dragging.Meanwhile,the Darbut and Karamay ophiolitic mélanges were em-placed into the overlying Carboniferous strata by pulling-out under the control of dextral strike slip shearing or lateral wedge extrusion.Subsequently,NE-SW extensional faults,represented by the Darbut fault,were developed during the late Late Car-boniferous to Permian,accompanied by extensive intrusion of intermediate to mafic dykes and granites.Between the end Permi-an and the Early Triassic,widespread E-W cleavages and thrust nappes in the Hala'alate Mountains were developed,and the Darbut sinistral strike slip fault was activated.From the Carboniferous to the Permian,the western Junggar underwent compli-cated evolutional processes including subduction,collision and intra-continental deformation,with multiphase tectonic over-prints of compression and extension.The tectonic evolution history in the study area fully exhibits the regional geodynamic processes in the tectonic transformation deformation.
Keywords：NW margin of Junggar basinCarboniferous-Permiantectonic transformationdeformation sequencestructural geology
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 504-520 )