气候变化领域集成服务门户(CCPortal): Late Mesozoic intracontinental deformation at the northern margin of the North China Craton: A case study from the Kalaqin massif, southeastern Inner Mongolia, China

CCPortal

DOI	10.1016/j.tecto.2020.228591
	Late Mesozoic intracontinental deformation at the northern margin of the North China Craton: A case study from the Kalaqin massif, southeastern Inner Mongolia, China
	Yang Q.; Shi W.; Hou G.; Zhang Y.; Wang T.; Zhao Z.
发表日期	2020
ISSN	00401951
卷号	793
英文摘要	The East Asian continent underwent intense crustal shortening-thickening and following large-scale lithospheric extension in the late Mesozoic due to multiple plate convergence. How to respond to the multiple plate convergence in the North China Craton remains enigmatic. Here we undertaken structural measurements and fault kinematic analysis of the Kalaqin massif in the northern part of the North China Craton (NCC), together with new geochronological results, delineate two stages of intracontinental deformation in the area: (1) NE–SW-striking ductile sinistral shearing (Ds) at 150–135 Ma; and subsequent (2) NW–SE ductile–brittle extensional deformation (De) at 135–110 Ma. Based on electron-backscatter diffraction (EBSD) analysis of quartz c-axis fabric and the characteristics of dynamically recrystallized quartz and feldspar, we estimate that ductile deformation during Ds and De occurred at temperatures of 400–700 °C (i.e., greenschist–amphibolite facies conditions). Kinematic vorticity analysis shows that Ds deformation was characterized by vorticity values (Wk) of 0.72–0.87 (average = 0.793), corresponding to general shear with a dominant simple shear component. Somewhat lower vorticity values of 0.45–0.92 (average = 0.698) during De event indicate a dominant pure shear component. We suggest that Ds reflected the regional NE-striking sinistral shearing represented by the Tan-Lu Fault Zone. Combined with contemporaneous dextral transpression along the ~E–W-striking Chifeng–Kaiyuan Fault and Fengning–Longhua Fault, these structures constituted a regional conjugate strike-slip system in the northern edge of the NCC. Ds event was likely associated with the episode B of the Yanshanian movement, which might result from the subduction of the Paleo-Pacific plate beneath East Asia and the closure of the Mongol-Okhosk Ocean. The subsequent De represents the destruction of the NCC during the Early Cretaceous, which was likely influenced by the roll-back of the Paleo-Pacific plate and post-orogenic extensional collapse of the Mongol-Okhotsk belt. © 2020 Elsevier B.V.
关键词	intracontinental deformation Kalaqin massif late Mesozoic North China Craton (NCC)Paleo-Pacific plate Yanshanian movement
英文关键词	Deformation; Feldspar; Geochronology; Kinematics; Quartz; Shearing; Shearing machines; Strike-slip faults; Structural geology; Vorticity; Ductile deformations; Electron back scatter diffraction; Extensional collapse; Extensional deformation; Kinematic vorticity; Lithospheric extension; Strike slip systems; Structural measurements; Plates (structural components); brittle deformation; crustal shortening; fault; feldspar; lithospheric structure; Mesozoic; plate convergence; quartz; strike-slip fault; subduction; vorticity; China; Mongol-Okhotsk Fold Belt; Nei Monggol; North China Block
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207903
作者单位	Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Natural Resources, Beijing, 100081, China
推荐引用方式 GB/T 7714	Yang Q.,Shi W.,Hou G.,et al. Late Mesozoic intracontinental deformation at the northern margin of the North China Craton: A case study from the Kalaqin massif, southeastern Inner Mongolia, China[J],2020,793.
APA	Yang Q.,Shi W.,Hou G.,Zhang Y.,Wang T.,&Zhao Z..(2020).Late Mesozoic intracontinental deformation at the northern margin of the North China Craton: A case study from the Kalaqin massif, southeastern Inner Mongolia, China.Tectonophysics,793.
MLA	Yang Q.,et al."Late Mesozoic intracontinental deformation at the northern margin of the North China Craton: A case study from the Kalaqin massif, southeastern Inner Mongolia, China".Tectonophysics 793(2020).