西秦岭造山带的演化、构造格局和性质

TECTONIC EVOLUTION FRAMEWORK AND NATURE OF THE WEST QINLING OROGENIC BELT

简要论述了西秦岭造山带显生宙以来的构造演化和格局,讨论了西秦岭造山带的性质。西秦岭造山带自800Ma左右以来,经历了超大陆裂解、洋陆演化、碰撞造山、板内伸展和陆内叠覆造山后才形成现今的西秦岭造山带。在不同的构造演化阶段,西秦岭有着完全不同的构造体制和格局。在洋陆演化阶段属板块构造体制,以多陆块洋为特征的洋陆格局;在板内伸展阶段属板内裂谷和裂陷盆地体制,以板内伸展盆地体系为特征的海陆格局;在陆内叠覆造山阶段属陆内盆山体制和陆内盆山格局。西秦岭造山带是一个"碰撞—陆内型"复合造山带。

In this paper tectonic evolution,framework and nature of the West Qinling Orogenic Belt after Phanerozoic Phhave been discussed Since about 800 MaPB,the West Qinling Orogenic Belt underwent breakup of supercontinent,evolution of ocean and continent,collisional orogeny,withinplate stretching and incontinental overprinted orogeny,and presentday West Qinling Orogenic Belt has been eventually completed During diffirent tectonic evolutional stages,the West Qinling Orogenic Belt has various tectonic style and framework In the evolution stage of ocean and continent,its tectonic style belongs to plate tectonics,and it is charecterized by framework of ocean and continent In withinplate stretching stage,its tectonic style belongs to a withinplate rift and faultsubsiding basin,and it is charecterized by a framework of sea and continent In incontinental overpritined orogenic stage,its tectonic style belongs to incontinental basinmauntain style,it is charecterized by an incontinental basinmountain framework Therefore the West Qinling Orogenic Belt is a 'collisionincontinental type'complex orogenic belt