Cenozoic Balanced Section Recovery And Sedimentary Flux Change In Qaidam Basin

Uplift and weathering erosion of the Tibetan Plateau resulting in Climate effects are at the forefront of a major international scientific problems.Since the Tibetan plateau composed by different mountain and basin,uplift of the Tibetan Plateau directly showed deformation uplift and erosion of mountain and subsidence and deposition of basin,which process is contacted by weather denudation and faulting.Climatic effects of and erosion and uplift of the Tibetan Plateau and the resulting international forefront of a major scientific problems.Uplift and weathering erosion of the Tibetan Plateau resulting in Climate effects are at the forefront of a major international scientific problems.Since the Tibetan plateau composed by different mountain and basin,uplift of the Tibetan Plateau directly showed deformation uplift and erosion of mountain,as well as subsidence and deposition of basin,which function process is contacted by weather denudation and faulting,driving force of this process is Indian plate collision and climate change,therefore,concerned about weathering and erosion history and matching rhaegmageny of basin-mountain region of the Tibetan Plateau,it captures the core of the relationship between the plateau uplift and climate change.Using material balance method of denuded zone and sedimentary area,namely,the total denudation amount and the total basin filling is substantially equal in process of Surrounding erosion of uplift and basin subsidence filling.In this paper,we take advantage of Cenozoic high-resolution chronostratigraphic sequence and climate and enviroment of variation sequence from the largest Basin-Qaidam Basin fromTibetan Plateau's northern.By restoration of balanced cross section from four north-south the middle of the Qaidam Basin of large transverse seismic-geologic section.we can confirm the scope and the thickness of the sedimentary strata as well as quantitative calculate of deposition flux(denudation amount)and the change trend of different times in Cenozoic from Qaidam Basin,then,establish significant Weathering erosion events?denudation rate and denudation processes of Cenozoic of Qaidam Basin of northern Tibetan Plateau.we can confirm the scope and the thickness and quantitative calculate of deposition flux(denudation amount)andthe change trend of different times of the sedimentary strata in Cenozoic from Qaidam Basin,and compare with event sequences of major geological structure of Cenozoic in this area and climate change and curves of global climate change,discuss main controlling factor of the change trend of deposition flux(denudation amount)of Qaidam BasinThe main access to the following results:(1)Obtained balanced cross section from four north-south the middle of the Qaidam Basin of large transverse seismic-geologic section,The calculation results of stratum shortening show that changes of Cenozoic stratum shortening of Qaidam Basin constituted by two fast stage and two smooth and slow period,fast shortening period were43.8-37.5Ma and 22Ma to date,two smooth slow shortening period were 53.5-43.8Ma,Two large cycles showed significant acceleration and post-deformation characteristics.(2)According to the Cenozoic stratum isopach map of Qaidam Basin based on different periods,we obtained Deposition flux(denudation amount)and the change trend of Qaidam Basin of Cenozoic strata in different periods,The sediment flux of 53.5—31.5.8Ma have a slight upward trend,31.5—22Ma is decline phase,,The sediment flux of 22-8.2Ma have a rapidly increase,8.2—2.65Ma shows slight downward trend.2.65Ma-0 rapid increase in the deposition flux.(3)Basin average reduction rate and the use of chloride ions,redness of climate proxies Qaidam Basin Cenozoic sedimentary fluxes controlling factors analysis showed that:53.5-43.8 Ma during deposition fluxes(denudation)increased mainly due to tectonic control evolution;43.8-37.5Ma during Cenozoic sedimentary basin is an increasing trend flux,while moist environment of the basin formation also showed an average reduction rate for accelerating trend,indicating deposition flux during this period by the tectonic evolution and change factors humid climate control dual control.37.5-31.5Ma basin sedimentary fluxes trend is on the rise,compared to the basin environment moist environment,basin average reduction rate slowed,wet climate change is the main reason for increasing the deposition flux.31.5-22Ma strata average reduction rate slowed in the wet basin of deposition flux decreases,indicating tectonic activity in the control basin sedimentary fluxes.22-14.9Ma deposition flux is an upward trend,while the average reduction rate is also accelerating the formation stage,but also in the wet period during which,it is during this phase deposition flux increased by climate evolution and tectonic activity jointly controlled.14.9-8.2Ma basin in the dry period,the deposition flux and average reduction rate of formation of high value,but the deposition flux smaller rise,indicating that at this stage of the evolution of increased tectonic activity and climate jointly controlled deposition flux.8.2-2.65Ma,deposition flux decreases,increased tectonic activity,the basin in arid phase,indicating that the climate is arid basin of deposition flux decreases the main reason.2.65Ma-0,the climate continued to Send a drought,exacerbated byrapid tectonic activity,sediment flux rapidly increased,indicating increased tectonic activity was the main reason for the increase in the deposition flux.