Tibetan Bangor Basin Sedimentary Evolution And Tectonic Deformation Feature During Cenozoic

The Bangor basin is a typical basin in a series of continental basins distributed on the Bangong Lake Nu River suture zone in central Tibet,and records a great deal of information about the uplift of the plateau and the evolution of the geomorphology.However,there is no unified conclusion on the evolution process of this kind of basin in the present study.It is an important geological historical period for the formation of the basin during the sedimentary evolution of the Cenozoic era in the Bangor region.The study has carried out a new understanding of the sedimentary evolution and structural deformation characteristics of the basin.In this paper,the composition of the sandstones in the Bangor basin is statistically analyzed.The distribution of the Cenozoic sediments in the Bangor basin may be derived from the uplift and uplift of the Lhasa ground and the uplift between the Bangor and the Lun poetra.The paleo current of the southern NW to the south of the Bangor basin indicates the provenance from the northern part of the basin,namely the South Qiangtang.There is still less paleogenrent in the south of the basin,but there is still a provenance from the southern part of the basin.According to the present geomorphology of the north and south margin of the basin,the paleogenrent data in the northern part of the basin may be due to the formation of the watershed between the basin and the lentalla basin before the Eocene,and the river course in the period of the sedimentary period of the niulburger formation.It is separated by the northern uplift and forms a river system independent of the Bangor basin.The lack of strata in the Cenozoic Ding Qing Lake formation may indicate that the water flow in the bango basin during the Cenozoic is stronger than that of the current river system.Data analysis of detrital zircon can reflect the diversity of the source area,which shows that not most of the source is derived from the South Qiang Tong,and a large part of the material comes from the Lhasa and may also come from other areas.There is a certain difference between the water system style of the water system in the modern Bangor area and the period of the sedimentary geological history of the Niu Bao group.The modern water system is mainly east-west,and there may be othersource areas.However,the data obtained in this paper do not find evidence to support other source areas.Since the initial formation of the Cenozoic basin,it can not be traced back.When the river system changes,it is impossible to rule out the influence of other Provenances on the composition of the Bangor basin.Based on the analysis of the data of the sedimentology in the Bangor basin,it is believed that the Bangor basin has become a certain scale in the Cenozoic,and is isolated from the water body formed in the northern Lun Poe region,indicating that the uplift of the northern side of the Bangor basin has been formed before the Cenozoic.The small local structure displayed in the Bangor basin shows that the collision between the Lhasa and Qiangtang bodies is sustainable in space,and this continuous tectonic action leads to the settlement of the earth's crust,thus providing a accommodating space for the sediments of the Bangor basin.