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《Chinese Journal of Geophysics》 2015-02
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Discussion on several problems in tectono-thermal modeling of rift basins

LIU Qiong-Ying;HE Li-Juan;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Tectono-thermal modeling of rift basins is to calculate the thermal and subsidence history of a rift basin during its formation and evolution on a lithosphere scale,which links tectonic and thermal developments perfectly.However,most extension models have the following problems:assuming the lithosphere to be 125 km thick initially,considering heat conduction in the asthenosphere only,controversial setting of the upper boundary and rarely including thermal effects of sediments.Some effects on the tectono-thermal modeling are discussed,including the initial crustal and lithosphere thicknesses,the convection of asthenosphere and the upper boundary of the model.We also calculate the differences of rift flank uplift between water and sediment loading models.The tectono-thermal modeling is based on a two-dimensional non-instantaneous extension model using the finite element algorithm in the Lagrangian system.By solving the heat conduction equation,the thermal history and tectonic subsidence history of the basin are modeled simultaneously.The results are as follows:(1)Initial crustal and lithospheric thicknesses have great influence on tectono-thermal modeling,especially on the tectonic subsidence.(2)Compared to the model considering heat conduction in the asthenosphere only,the heat convection model has slower tectonic subsidence and thermal decay rates,and temperature from lower crust to the bottom of the model is significantly higher.(3)The fixed or moving upper boundary during themodeling affects the calculated heat flow and tectonic subsidence in the thermal subsidence phase,and has remarkable influence on the temperature field.The effect increases with the increasing of the stretching factor.(4)Rift flank uplift of the water loading model would disappear within 200 Ma while the uplift would be stable at a certain value for the sediment loading model.If the initial crustal and lithospheric thicknesses are uncertain in the modeling,sets of initial thicknesses should be given.The optimum initial crustal and lithospheric thicknesses can be determined when the calculated heat flow,Moho depth and lithospheric thickness fit observed values best.Pure heat conduction and pure heat convection in the asthenosphere are two limiting cases for extension models.In the rheological boundary layer,effects of both heat conduction and convection should be considered.For strong extensional areas,using the fixed upper boundary model would generate large calculation errors,especially in the temperature field.The thermal effect of sediment cannot be ignored when calculating the rift flank uplift.
【Fund】: 国家自然科学基金重大研究计划(91114202)资助
【CateGory Index】: P542;P314
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