Title: The structure characteristics and geological significance in the northern segment of Kejie Fault
Abstract: Kejie fault is one of the important faults in western Yunnan,which controls the stratigraphy sedimentation on both side of the fault zone from the early Paleozoic,however,the understanding of Kejie fault is not very profound by now.In order to study the deep structure characteristics and geological significance of Kejie fault,we set up one survey line which across the Kejie fault for MT measure,the measuring result shows that the Kejie fault is NE trend,according to the deep electrical structure characteristics in northern segment of Kejie fault was obtained by MT,which shows that there is three faults in profile,inferring fault F1 and F2 are the two branches of the Kejie fault,in addition,the fault Fl is large-scale and deep cut,the fault F2 is smaller than Fl fault;The fault F3 maybe is lithology contact zone.Combined with the features of stratigraphic distribution and lithology,founding the Late Ordovician~ Early Silurian Renheqiao Formation strata on the east side of Fl fault overlaying on the Late Permian Shazipo Formation strata on the wast side of Fl fault;In the deep of F2 fault,the Neoproterozoicthe Yungouyan Formation strata overlaying on the Early Carboniferous Xiangshan Formation strata,nevertheless,In the shallow of F2 fault,the Late Cretaceous granite contact with the Early Carboniferous Xiangshan Formation strata;In addition,the Late Cretaceous granite overlaying on the Neoproterozoicthe Yungouyan Formation strata,F3 fault exists between them.So we can deduce that Kejie fault is a thrust fault which formed in Lancang Movement,and the formation of fault F2 is earlier than fault Fl,fault F3 is formed by the late magmatic activity.Comprehensive the electrical characteristics and the geological conditions in the northern segment of Kejie fault,we think that the Kejie fault is formed by the plate convergence of the Baoshan plate and the Changning-Menglian suture zone,then it had experienced a multistage structural evolution after Lancang movement,which was controlling the stratigraphy sedimentation for a long time before the Permian,therefore,the Kejie fault should be the boundary between the Baoshan plate and the Changning-Menglian suture zone.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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