ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
中国东部及邻区晚中生代伸展拆离构造——综述与新认识
  
关键词:East Asia continent  extensional detachment structures  gravity lineament  strain mechanism  lithospheric thinning  paleo-Pacific plate
基金项目:国家重点研发计划项目(编号: 2017YFC0601402);中国地质科学院地质力学研究所基本科研业务费专项项目(编号: DZLXJK201712)
作者单位E-mail
杨谦 中国地质科学院地质力学研究所
北京大学地球与空间科学学院
自然资源部新构造运动与地质灾害重点实验室 
workingyq@163.com 
施炜 中国地质科学院地质力学研究所
自然资源部新构造运动与地质灾害重点实验室 
shiweinmg@163.com 
侯贵廷 北京大学地球与空间科学学院  
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摘要:
Late Mesozoic Extensional Detachment Structures in Eastern China and Adjacent Areas: Overview and New Insight
      Extensional structures constitute an important deformation form in the upper shallow layer of continental lithosphere thinning and destruction. Among them, the low angle extensional detachment structure which is the remarkable tectonic deformation style of Late Mesozoic crust extension in eastern China and adjacent areas is the key to studying the relationship between the deformation characteristics of the shallow layer in lithosphere and its deep layer activity process. Combined with related data of geometry, kinematics and chronology, the authors made a systematic exposition of spatial and temporal distribution, kinematic polarity and strain mechanism of low angle extensional detachment structures in eastern China and adjacent areas in this paper. The spatial distribution of these extensional detachment structures in East Asia continent is not homogeneous and this indicates uneven stretching and thinning of the lithosphere. As for the formation ages, stretching activities were mainly concentrated in two periods: 140–125 Ma was the initial formation stage of these extensional detachment structures in the middle-lower crust and the main deformation mechanism was simple shear which was controlled by horizontal extension; 125–110 Ma was the rapid uplift and erosion stage and the main deformation mechanism was pure shear which was dominated by vertical compression. Relevant marks of kinematics and geometry show that these extensional structures have the characteristics of one-way low angle extensional detachment in the NW–SE direction, implying the effect of uniform NW–SE extension stress field. The stretching activities in east and west regions were separated by Da Hinggan Ling–Taihang Mountain–Wuling Mountain gravity lineament and both had the tendency of spreading from NW to SE, but the west area was more visible than the east one and it also represented the different geodynamic settings. The east part was mainly affected by the retreat of the ancient Pacific plate. The west region might be related to the combined effects of the large-scale stretching activities resulting from the gravitational collapse in thickening crust after the closure of Mongolia–Okhotsk and the stress extension after intra-continental orogeny of Qinling–Dabie belt.
YANG Qian,SHI Wei,HOU Gui-ting.2019.Late Mesozoic Extensional Detachment Structures in Eastern China and Adjacent Areas: Overview and New Insight[J].Acta Geoscientica Sinica,40(4):511-544.
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