试论秦岭造山带岩石圈构造演化基本特征

A Discussion on Basic Features of Tectonic Development of Lithosphere of the Qinling Belt

以现代活动论观点和80年代以来大陆地质研究的新进展为指导,从秦岭造山带的基本组成与结构的实际调研出发,进行地质、地球化学和地球物理多学科综合研究,探讨秦岭造山带岩石圈构造演化基本特征,可以初步认识到秦岭造山带是一个具有复杂组成与结构,长期演化历史,在不同发展阶段以不同构造体制演化,而又长期基本处于大陆岩石圈动力学背景下发展所形成的独具特征的不对称扇形复合型大陆造山带,并且现今仍是一个深部热构造活动区正在隆升的年青山脉。

The fundamental composition and structure of the Qinling orogenic belt are investigatcd in recent years and plenty of geological, geophysical and geochemical data concerned have been acquired through the multidisciplinary studies. This paper therefore discusses the basic aspects of tectonic development of the lithosphere of the Qinling orogen in terms of modern mobilism and in the guidance of new development in continental geological researches since the 1980s. It is evident that the Qinling oroginic belt has a long evolutionary history and is characterized by its complicated composition and fabric. It comes to a tentative conclusion that the Qinling range has evolved in different tectonic regimes at distinct evolutionary stages and is developed into a, symmetrically fan-like, uniquely—featured, and compound continental orogenic belt under the control of dynamic mechanism of continental lithosphere. Moreover the Qinling is still a young rising mountain range which is now influnccd by deep-seated thermal—mechanical proceses.