云南中西部新生代陆内变形及其动力学

CENOZOIC INLAND DEFORMATIONS AND THEIR DYNAMICS IN THE CENTRAL-WESTERN YUNNAN

云南中西部在喜马拉雅期的地壳变形较前新生代有根本性改变褶皱变形总体较弱,以大面积隆起、断块差异运动和某些深大断裂的复活及断陷盆、谷地的形成为主要特点。地震活动活跃,热流异常明显,伴随大规模Cu、Pb、Zn、Ag等多金属成矿作用。陆壳的变形通过大规模断裂作用实现局部调整,而构造隆升在时空演化上表现出来的整体性、差异性和分阶段性,造山方式的多样性和复杂性,实际上是新生代以来云南中、西部地区岩石圈地壳演化及其陆内变形十分复杂的地球动力学过程的综合响应。

The Cenozoic inland deformations in Central-Western Yunnan are evidently different from those of pre-Cenozoic, which are featured mainly by the weakly folding, uplift in large area, block difference movement, rejuvenation of paleo-fault, formation of faulted basin and valley. The active earthquake, intense thermal fluid are accompanied by the Cu-Pb-Zn-Ag polymetallic metallogenesis. The local adjustment of land crust deformations are fulfilled by the faulting in large scale. Moreover, the unity, difference and phasic development in time-space evolution of structure uplift, the multiplicity and compexity of orogenic pattern are actually the comprehensive response to the very complicated geodynamics process of the crust evolution and the inland deformation in the lithosphere of Central-Western Yunnan since Cenozoic.