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根据下扬子地区区域构造、地温场和大地热流密度的分布特征，结合岩石热物性参数测试结果和该区的地壳分层模型，确定了地幔热流密度分布特征和壳幔边界温度以及居里等温面的埋藏深度。根据干玄武岩固相线公式，估算了上地幔介质部分熔融开始的深度（“热”岩石圈厚度）。结果表明，地幔热流密度在３０～４０ｍＷ／ｍ２之间；壳幔边界温度在４６０～７００℃之间变化；居里等温面埋深为２５～３５ｋｍ，“热”岩石圈厚度为８０～１５０ｋｍ。深部热状态的分布特征主要与新生代的构造热事件相关。苏北盆地和郯庐断裂带存在明显的深部热异常。
According to the distribution characteristics of the regional structure, geotemperature field and geothermal heat flux in the Lower Yangtze region, combined with the test results of the thermal physical property parameters and the crustal stratification model in this area, the characteristics of the heat flux density and the boundary temperature of the crust and mantle and the Curie isothermal surface Buried depth. Based on the dry-basalt solidus formula, the depth at which the upper mantle medium begins to melt (“hot” lithosphere thickness) is estimated. The results show that the heat flux density in the mantle is between 30 and 40 mW / m2; the boundary temperature of crust and mantle varies between 460 and 700 ℃; the buried depth of Curie is 25 ~ 35km; the thickness of “hot” lithosphere is 80 ~ 150km. The distribution of deep thermal state is mainly related to the Cenozoic tectonic thermal event. There are obvious deep thermal anomalies in the Northern Jiangsu and Tanlu faults.