压(扭)性动力学环境下动力机制转换与板内沉降坳陷形成

The Conversion of Dynamical Mechanisms and Formation of Intra-Plate Depression Under the Compresso(-Shear)Dynamics

中国大陆自海西构造运动末期-印支构造运动初期,各主要洋盆基本碰撞关闭并褶皱成山,焊接为统一大陆板块,构成中新生代山-盆体系,形成在印度板块和太平洋板块夹持作用下,以板内构造特点发展演化的格局。板内盆地是指中国大陆在二叠纪末(或三叠纪初)大洋板块关闭,焊接为一体的大陆板块全部或基本转为陆相沉积时期的重要构造类型。中国西北区中新生代盆地形成演化进程归属汇聚板缘洋壳俯冲或碰撞构造动力远距离传递影响下的板内构造动力学和运动学作用范畴。文章通过对中国西北部中新生代盆地在压性、压扭性动力场环境中,不同类型原型盆地(或坳陷)的沉降运动轨迹和方式,及其形成、演化过程的构造及沉积层系蕴育的构造运动学过程遗迹及后期演化、改造的证据研究,探索盆-山耦合动力系统的构造运动学过程及其对构造变形体系的制约机制,以揭示中国西部盆-山耦合体系构造动力学机制及其动力转换。

During the late Hercynian to early Indosinian, most of main oceanic basins of Chinese continent were closed and then had been folded into mountains. The final assembly of different terrenes forms the whole continental plate and the Meso-Cenozoic range-basin system. Also, an intra-plate evolutional pattern under the control of Indian and pacific plate were formed. Intra-plate basin is an important tectonic style by the time of the formation of the united Chinese continent in the Permian （or Triassic） when the oceanic basins were closed and entirely transmuted into terrestrial sedimentation. The formation and evolution of the Meso-Cenozoie basins of northwest China belong to the dynamics and kinematics category which was derived from long-distance effects of oceanic crustal subduction and collision. By studying the settlement motion trajectory and modes of different prototype basins or depressions, and the tectonic movement recorded in strata, and the formation and evolution of the structure, and the evidence of the evolution and transformation of the late time, we probe into the kinematics process of basin-range coupling system and its constraining on the structural deformation system, in order to reveal the dynamics mechanisms and dynamical conversion of basin-range coupling system in western China.