THERMAL STRUCTURE OF THE CRUST AND UPPER MANTLE OF LIAOHE RIFT BASIN, NORTH CHINA

On the basis of analysing terrestrial heat flow and mantle heat flow values, the crustal temperatureat depth was calculated for Liaohe Rift Basin in North China, and a conceptual model of thermal struc-ture of the crust and upper mantle of the Basin has been suggested. Results indicate that Liaohe Basinis characterized by a relatively high mantle heat flow (0.98 HFU) but low crustal heat flow (0.57HFU),both caused by upwelling of the asthenosphere and crustal thinning during rifting process in early Eo-gene in thc region studied. This sort of thermal structure of the crust and upper mantle seems to beinherent in the region in between tectonically stable and active areas and has been considered to be theproduct of the history of geological evolution of the Basin since Mesozoic era.     

辽河裂谷盆地地壳上地幔热结构

本文在分析辽河裂谷盆地大地热流和地幔热流值的基础上,计算了地壳深部温度并给出盆地热结构概念性模式。指出,由地幔上隆所致的软流圈抬升,导致盆地来自深部的热流分量增大(0.98HFU)~(1));在裂谷发育过程中造成的地壳减薄,使地壳热流部分减小(0.57HFU)。与世界其他地区相比,这种壳、幔热流构成与配分,具有介于构造稳定区和活动区之间的特点,并且认为是辽河裂谷盆地中、新生代以来长期地质历史发展的产物。此外,作者还分析了辽河裂谷盆地地壳内部各层段的热流构成和温度状况,并指出其与盆地油气生成和地热资源分布间的关系。