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中生代大陆活化是一个典型的陆内变形与运动演化问题,所产生的构造变形、大范围岩浆活动和成矿作用等一系列问题是目前俯冲碰撞观点难以圆满解释的。湖南地区对冲构造带和背冲构造带相间排列,反映中生代至少发育两套相反的道冲剪切推覆构造系统,它们是壳块不同演化时期多向运动变形的产物。由此提出多元动力体系组成、增减、转换和叠加影响综合模式。其中会聚式地@蠕动和扩散式地撞蠕动所产生的岩石囵增厚和减薄是引起中生代构造变形和活化的根本原因,西太平洋壳体的西向俯冲、特提斯东向俯冲及周缘造山带的侧向挤出效应等则是不可忽略的外部因素。
The Mesozoic continental activation is a typical problem of intracontinental deformation and movement evolution. A series of problems such as tectonic deformation, large-scale magmatism and mineralization are difficult to be satisfactorily explained by current subduction collision views. The heliotectonic belt and back-buildup belt in Hunan Province are interlaced, reflecting that at least two opposite sets of ductile shear nappe structures developed in the Mesozoic are the products of multi-directional movement deformation in different evolutional stages of the shell. Therefore, the composition of multivariate dynamic system is proposed, and the comprehensive mode of influence is added, reduced, converted and superimposed. Among them, the thickening and thinning of the rocks caused by peristaltic and diffusive percussion creep are the fundamental causes of the deformation and activation of the Mesozoic tectonics. The west subduction of the western Pacific Ocean, the Tethys eastward subduction and the peripheral orogeny Lateral extrusion with the effect of the band is not negligible external factors.