HEAT FLOW ON THE QINGHAI-XIZANG(TIBETAN) PLATEAU AND THE MODELING OF THE TECTONO-THERMAL EVOLUTION

Thirteen observed heat flow values in combination with relevant geological and geophysical information are employed in the current paper to conduct a model study by means of direct inversion. The modeling demonstrates the tectono-thermal evolution of the Tibetan Plateau during the last 40 Ma since the continent-continent collision. The authors stress the fact that the tectonic deformations of terranes are usually the inducing factors for the deep-seated thermal activities in the crust and upper mantle. On this basis a series of kinematic equations of 3-D deformations of terranes in forms of shortening-thickening-uplifting-erosion-mass sliding were deduced using the principle of plate kinematics. These equations are further used as systematically defined initial and boundary conditions for simulating the integrated processes of tectono-thermal evolution, The results of the model study suggest that there exist sharp differences in the tectono-thermal evolution between the old northern terranes and the new     

青藏热流与构造热演化模型研究

本文以13个实测热流值为主,综合了有关地质-地球物理资料,通过正演拟合的模型研究,展现了青藏高原自陆-陆碰撞以来的40Ma间地体的构造热演化过程。文中着重强调地体构造变形是壳幔深部热作用的主要诱发因素,据此用板块运动学原理推导出地体的缩短-增厚-抬升-侵蚀-滑移等三维变形的运动学方程组,作为模拟地体综合构造热演化过程的系统定义的初始和边界条件。模型研究结果表明:青藏高原南北新老地体的构造热演化差异很大,但南部热地体中深部热过程的规模比预期的水平要低。