论古亚洲洋、特提斯、太平洋三大构造域OA

From a global geodynamic perspective,during the Phanerozoic,China and adjacent regions can be divided into three major tectonic domains:the Paleo-Asian Ocean,the Tethys,and the Pacific.The Paleo-Asian Ocean tectonic domain,representing the eastern segment of the Iapetus-Paleo-Asian Ocean tectonic domain,defined the Paleozoic tectonic framework of China and adjacent regions.The Tethys domain and the Pacific domain have been mostly superposed on the Paleo-Asian domain:the former establishs the Meso-Cenozoic tectonic configuration of western China and the latter manifests the Meso-Cenozoic tectonic features of eastern China.The Phanerozoic tectonic history of China and adjacent regions is a record of the breakup of the Gondwana supercontinent,the accretion of the Siberian craton,and the development of the three aforementioned tectonic domains.H owever,this evolution was not simply characterized by the breakup of southern Gondwana and its subsequent northward drift and eventual accretion onto the margins of a Siberia-centered Asian continent.In fact,the vast area from the Himalayas to Siberia was once part of the Gondwana supercontinent during the late Neoproterozoic.The breakup and accretionary episodes involved the staged rifting of the Gondwana supercontinent,beginning from Sayan-Erguna,and the subsequent phased amalgamation into the Siberia-centered Asian continent.The dynamic systems controlling the Phanerozoic tectonic evolution of China and adjacent regions are not simply three long-coexisting systems since the Neoproterozoic.Rather,they comprise three regimes that emerged successively since the late Neoproterozoic:the Iapetus-Paleo-Asian Ocean system,the Tethys-Paleo-Pacific system,and the Atlantic-Indian Ocean-Pacific system.The Paleo-Asian Ocean dynamic system originated in the late Neoproterozoic and ended in the Middle Permian,governing the Paleozoic tectonic evolution of China and adjacent regions.The Tethys-Paleo-Pacific dynamic system commenced in the Early Carboniferous and terminated in the Early Cretaceous,controlling the Mesozoic tectonic evolution of China and adjacent regions.The Atlantic-Indian Ocean and the Pacific dynamic systems began in the mid-Cretaceous and have dominated the Cenozoic tectonic evolution of China and adjacent regions.Interestingly,the transition from the Iapetus-Paleo-Asian Ocean dynamic system to the Tethys-Paleo-Pacific dynamic system in the Early Carboniferous-Middle Permian coincides with the 320 to 265 Ma Kiaman negative polarity superchron.The transition from the Tethys-Paleo-Pacific dynamic system to the Atlantic-Indian Ocean-Pacific dynamic system in the Mid-Cretaceous coincides with the 126 to 83 Ma Cretaceous positive polarity superchron.These correspondences seem to indicate that the material motion of the core,which produces the geomagnetic field,may have played a very important role in the tectonic evolution of the Earth's crust.