秦岭显生宙古海洋演化

EVOLUTION OF THE PHANEROZOIC PALEO-OCEAN OF QINLING

From Cambrian to the end of Middle Triassic,the Siberia-eastern China-Australia axis rotated from an eat-westward equatorial arrangement to south-northward longitudinal arrangement.Meanwhile North and South China migrated toward Siberia and finally integrated with it to form the Asia Continent. During this general process, evolution of the Phanerozoic paleo-ocean of Qinling underwent four stages: (1) the evolntion of North Qinling mico-ocean and South Qinling micro-ocean as well as rifted abyssal basin during Early Paleozoic;(2) the Late Caledonian-Early Hercynian coalescenoe of North and South Qinling and Devonian basinal sedimentary differentiation under compression;(3) the Late Hercynian-Early Indosinian evolution of Central Qinling rift basins and North Qinling residual basins under extension in south and compression in north;(4) the sea-basin vanishment,folding and orogeny of Qinling area during middle and late episodes of Indosinian movement.