东秦岭的泥盆系及构造演化

本文简述了有关秦岭构造演化的不同解释;从沉积、古地理、古构造等方面讨论了北带泥盆系与与中、南带泥盆系的明显差异及它们的分界位置;论述了秦岭属印支带及其东延的主要证据;提出了秦岭构造演化模式。

THE DEVONIAN SYSTEM AND TECTONIC DEVELOPMENTIN THE EASTERN QINLING MTS.

The Devonian in the Oinling region may be divided Into the north, the middle and the south three zones. The north zone and tile middle - south zoues belonged respectively to the North China and the Yangzi continental marginal sedimentary systems. The surface boundary between two sedimentary systems, is complicated by latterly overthrusting and faulting and falls down with the Shanyang - Fengxian- Mayanhe - Lixian fault. The Qinling region has undergone a complicated tectonic development process since palaeozoic Era: the oceanic crustal subducting (Caledonian) ; the crustal spreading between the North zone and middle zone (Devonian )j the middle zone's (afrag-ment of Yangzi plate) accreting to the North China plate and the crustal spreading between the Middle zone and south zone (early Hercvnian); and finally the collislonal orogeny between the North China and Yangzi plates (Indosinian). The basement composition of the Indosinian Qinling trough is still incertitude.