Orogenic-Sedimentology: Some Examples From Typical Orogenip Belts In China

Through study of the sedimentaiy geology in the several main belts in China, it is mainly purpose that paper introduces the classic sedimentology to a research on the formation and evolution of erogenic belts and builds up a relatively systemic method and theory of the Orogenic-Sedimentology.In a study on a sedimentary basin analysis of the Huanan orogenic belt, the sedimentary basin character and evolution in the southeastern passive continental margin of the Yangtze plate is investigated with elaborate sedimentary environments and sedimentary character from the Sinian to the Triassic, and then the sedimentation sketch of this belt is established especially to be from rift, passive continental margin into foreland basin in the early Paleozoic on the Yangtze plate. The tectonic subsidence curves on the southeastern margin of the Yangtze plate are drawn out using of backstripping method for the basin formation and evolution. The basins located in the southern margin of the Yangtze plate, in the basin dynamic computer simulation, is explored and constituted to be a typical foreland basin which is of not rather high mountain and thermal situation to be lower in this older orogeny belt.During the work period in the southern zone of the East Qinling belt, the process of sedimentation, basin quality and its interior structure and configure, important events are studied from the Sinian to the Triassic, especially through more than one hundred km profile across the southern zone of the East Qinling belt. In the technical method, the basin dynamic analysis in the Cambrian and the Devonian respectively and the cycle events in the late Triassic are added to the research of the belt. The some basic and important viewpoints of the Orogenic-Sedimentology are prompted in the study method, thought and connotation fields in this stage.In the study of Himalayan belt, the sedimentation is detailedly studied during the Triassic to the tertiary in the southern Tibet. The tectonic subsidence analysis and dynamic mechanism of the basin evolution are processed in the main sedimentary basins across this belt. The formation and dynamic evolution of the Tethyan carbonate platform is discussed in this area. The classic geological model from the rift, passive continental margin to foreland basin in the Himalayan belt is basic build up basically.In the link party of Qinling-Qiliang-Kunlun belt, the Polyarc-basin systemic characteristic is discussed with strengthen and standout study on the detail relationship analysis between the arc-basin. The Bayan Har Basin thought to be the preexistence of the Songpan-Garze belt, is a back-arc basin among a series of Polyarc-basin systems behind the Qiangtang-Taniantawong front the arc beginning in the Late Paleozoic. The eastern margin started as the western passive continental margin of the Yangtze block (D-T2), then changed into a foreland basin related to the North China block and the Qiangtang block during the middle to late Triassic. The stratigraphic sequences and sedimentological characteristics indicate that the main body of the Bayan Har Basin is composed of Triassic flysch sediments deposited in a foreland basin during the Triassic.In the study of Jinshajiang orogenic belt, in the applying archipelago theory and particular anatomies to basin analysis in this orogeny, the model of Jinshajiang archipelago mountain building and basin building is set up. The Orogenic-Sedimentology and sedimentary basin analysis system is printed archipelago paleogeography any more.When the research content and meaning of the Orogenic-Sedimentology far more is expanding, and enlarging to the global paelogeography. The evolution history in rifting-assemble of southern China continental landmass is investigated with a relationship between sedimentary basin and orogenic belt, which reflects not only a synchronizing but also asynchronies in contrast, the southern China landmass with the global paelogeography. Meanwhile it is promoted that the Pan Cathaysian is an important part of the global paelog...