华北克拉通中生代幔源岩浆岩放射性元素生热率的时空差异与主控因素OACSTPCD

Geothermal resources within the North China Craton have a strong association with Mesozoic magmatic activities.However,the precise link between the origin,distribution,and magmatism of these geothermal resources remains elusive.To investigate the influence of Mesozoic magmatic activity on the geothermal resources within the North China Craton,this study calculated the radioactive heat generation rates of rocks during various periods by utilizing data on U,Th and K heat generation elements from 632 sets of mantle-source magmatic rocks.This calculation was conducted on the basis of clarifying the period,rock type,genesis,and distribution of Mesozoic mantle source magmatic rocks.The research aimed to investigate the temporal-spatial disparities and primary controlling factors behind the radioactive heat generation rates of Mesozoic mantle-derived mag-matic rocks within the North China Craton.The outcomes highlight that the type of mantle-derived magmatic rocks serves as a direct determinant of the heat generation rate.Specifically,nepheline syenite,pyroxene,syenite and lamprophyre display high-er heat generation rates compared to gabbro,diabase,and basalt.Moreover,the origin of mantle-derived rocks emerges as the foundamental basis for the high radioactive heat generation rate,and the thermal generation rate of rocks within the collision en-vironment surpasses that within the extensional tectonic setting.Substantial variations in the heat generation rate are observed a-mong magmatic rocks formed under different destructive mechanisms.The rocks within the lithosphere damaged area by ther-mal-chemical erosion typically exhibit higher heat generation rates than those affected by delamination in the lithosphere.