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Inversion of background thermal history since the formation of the Tarim Craton

CAO HouZhen;HE LiJuan;ZHANG LinYou;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences;Institute of Earth Science,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
The Tarim basin is a typical large-scale superimposed structure which developed on a Archean-Early Proterozoic crystalline basement,with stable craton properties.Its present-day surface heat flux is only 43 mW·m~(-2),with average geothermal gradient 21℃·km-1 and Moho temperature550℃.The low heat flow background value indicates that this basin experienced a process of secular cooling and thickening.However,for such a secular cooling process,previous studies only concentrated on Phanerozoic stage and did not cover the entire thermal history of Tarim.In this paper,we use the thermal data of the Tarim area as a constraint,and set up the bottom boundary conditions according to different mantle dynamic models.Then,the background thermal history of Tarim is reconstructed by forward modeling,which fills the gap in the study of thermal history before thePalaeozoic in this region.The results show that the background heat flow of Tarim was decreasing(reduced from 85 mW·m~(-2) to 43 mW·m~(-2))and the lithosphere was thickening(increased from 130 km to 190 km)continuously since the basin′s formation.On a long time scale,the thermal evolution model of the Tarim craton is secular cooling and thickening,which is similar to that of other typical cratons in the world.While,under the influence of short-term local tectono-thermal events,the thermal history of the Tarim craton was superposed by about 20~40 mW·m~(-2) thermal disturbance on the trend of secular cooling.
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