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在大地热流密度分布的基础上,本文基于二维稳态热传导方程,根据研究区热导率、生热率等热物理性质参数,对横穿川东北地区、秭归盆地、黄陵穹窿和江汉盆地等几个构造单元的奉节(FJ)—观音挡(GYD)地学剖面进行了温度场数值模拟研究,获得了其深部热结构认识。模拟结果显示,地幔热流自西向东逐渐升高,变化范围约为25.3~34.7 mW/m~2。莫霍面温度大约在380℃~450℃之间变化。热岩石圈厚度自西向东先稍微增厚,后逐渐变薄,变化范围约为115~171 km。江汉盆地中新生代的伸展作用使其地幔热流稍有升高,“热”岩石圈厚度相对较薄(约116 km);而川东北地区则受到早期的挤压和晚期的抬升剥蚀作用,地幔热流相对较低,其深部“热”岩石圈厚度也相对较厚(约168 km)。
Based on the two-dimensional steady-state heat conduction equation, based on the thermophysical properties such as thermal conductivity and thermal growth rate in the study area, (FJ) - Guanyin block (GYD) geologic profile of several tectonic units were studied by numerical simulation of temperature field and their deep thermal structure was obtained. The simulation results show that the heat flux in the mantle rises gradually from west to east, with a variation range of 25.3 ~ 34.7 mW / m ~ 2. The Moho temperature varies between 380 ℃ ~ 450 ℃. The thickness of the hot lithosphere was slightly thickened from west to east, then gradually thinned, with a variation range of 115-171 km. The Mesozoic-Cenozoic extension of the Jianghan Basin led to a slight increase of the heat flux in the mantle. The thickness of the “hot” lithosphere was relatively thin (about 116 km); whereas the northeastern Sichuan area was subject to early crusting and uplifting and denudation , The heat flux in the mantle is relatively low, and the thick “hot ” lithosphere is relatively thick (about 168 km).