秦岭古生代陆间裂谷系的演化

位于华北地块和杨子地块之间的秦岭构造带是一个古生代的陆间裂谷系,它的形成、发展和消失与两个地块的离合运动有关。秦岭陆间裂谷系不仅在它的空间位置,而且还在许多地质构造方面的特点而不同于大陆裂谷,包括裂谷系的广阔宽度、洋壳碎片的发育、很厚的海 相沉积和较强的深层作用。

THE EVOLUTION OF QINLING INTERCONTINENTAL RIFT SYSTEM IN PALEOZOIC

The North China and Yangzi platforms came into collision in late Proterozoic. The Qinling rift system developed in Paleozoic, when two platforms broke up again. The rift system underwent extending in Early Paleozoic. At that time the continental crust thinned and even changed into transitional and oceanic crust caused by the mantle uplift. The rift turned to its contracting stage when two platforms were close to each other in Late Paleozoic. At last, a series of folds and thrusts have appeared through the Indosinian movement when two platforms came into collision again in Late Triassic. The Qinling intercontinental rift system is different from continental rifts, not only in its location, but also in many of geological aspects, including its broad width, oceanic crust fragmentation, thick marine sedimentation and intense diastrophism.