【摘要】 应用多种古地温研究方法恢复了中国北方各盆地中生代晚期的古地温及古地热梯度。以阿尔金断裂为界 ,东部盆地与西部盆地地热梯度存在明显差异。东部盆地以断陷型盆地为主 ,地壳明显减薄 ,岩浆活动强烈 ,表明存在一期强烈的具有区域规模的构造热事件 ,地热梯度高 ,普遍高于 3 .60℃ /10 0m ,最高可达 5 .5 6℃ /10 0m ;西部盆地为挤压拗陷型盆地 ,地热梯度总体上明显比东部盆地要低 ,地热梯度普遍不超过 3 .0 0℃ /10 0m ,地壳增厚 ,岩浆活动性弱。中国北方东部和西部盆地中生代晚期地热梯度的差异表明东部及西部地球动力学背景明显不同。图 2表 1参 2 1更多还原

【Abstract】 By using many geothermal study methods, the late Mesozoic paleo temperature and geo thermal gradient have been restored. Results show that western basins and eastern basins which takes Aerjin fault as dividing line, have obvious difference in geo thermal gradient. Geo thermal gradient of eastern basins is high, which is generally higher than 3.6℃/100m, and the highest can reach 5.56℃/100m. Eastern basins mainly are faulted basins in type, where the thickness of crust obviously decreases and magmatic activity is intense. These indicate that there is an intensive regional structural thermal event. However, the western basins are of depression basins, the geo thermal gradient of them is generally lower than 3℃/100m, i.e. lower than the eastern basins. In western basins thickness of crust increases and magmatic activity is weak. The geo thermal gradient difference between western and eastern basins of North China in late Mesozoic shows that geodynamic background is different in eastern and western basins.更多还原