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大巴山前陆弧型构造带形成机理分析
Received:March 16, 2009  Revised:March 28, 2009  点此下载全文
Cite This Paper:Zhang Yueqiao.2010.Formation mechanism of the Dabashan foreland arc-shaped structural belt[J].Acta Geologica Sinica,84(9):1300-1315
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Author NameAffiliationE-mail
Zhang Yueqiao Institute of Geomechanics, Chinese Academy of Geological Sciences zhangyueqiao@yahoo.com 
基金项目:中国地质科学院地质力学研究所基本科研项目(项目批准号:DZLXJK200715)
中文摘要:基于野外观察和构造测量,论述了大巴山前陆弧型构造带的基本构造特征,包括弧型带展布特征、分带特征、分段特征、分层特征、构造变形样式、叠加变形特征和古构造应力场特征等,在此基础上探讨了大巴弧形成的主要控制因素。指出大巴弧形成的机理不同于经典的碰撞造山模式,该弧型构造带经历了古生代大陆边缘伸展裂陷初始期、中晚三叠世碰撞造山雏形期和中晚侏罗世陆内造山定型期。造山作用前的古大陆边缘伸展作用及其产生的不规则边界形态对弧型带的形成起到了决定作用。其中先成的城口-房县弧型断裂带不仅控制了早古生代沉积-岩浆作用,同时成为大巴弧形成的主导边界条件,而弧型带两端的基底隆起也起到了重要的限制作用。根据实际地质资料设计的简单沙箱模型模拟了这个弧型带的形成条件和过程。
中文关键词:大巴山前陆弧型构造带  构造变形样式  叠加变形  古构造应力场  构造物理模拟
 
Formation mechanism of the Dabashan foreland arc-shaped structural belt
Abstract:Based on field observations and structural measurements, this paper describes basic features of the Dabashan foreland arc-shaped structural belt, its distribution pattern, zonation, segmentation, vertical stratification, deformation pattern, superimposed folding and paleostress field, then discusses main factors controlling the formation of this structural arc. It pointed out that the formation and development of the Dabashan foreland arc are different from classical model of collisional mountain built-up; it was shaped through three different stages: original boundary conditions formed during Paleozoic extension and rifting along the marginal zone of the Yangze; initiation during Middle-Late Triassic collisional orogen; and final formation during Middle-Late Jurassic intra-continental orogen. The arc-shaped Chengkou-Fangxian fault zone not only controls the Early Paleozoic deposition and magmatism, but also played key role in the foreland arc formation, and the basement uplifts at the two syntax acted as important boundary conditions. Sandbox modeling was carried out in the laboratory to model the formation and boundary condition of the Dabashan foreland arc. The model was set-up according to the real geologic data.
keywords:Dabashan foreland arc-shaped belt  deformation pattern  superimposed fold  Paleostress field  tectonophysical modeling
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