| Abstract |
Globally, volcanic geothermal systems often exhibit high geothermal manifestations and host numerous high-temperature geothermal systems suitable for power generation. The Changbai Mountain region is considered to possess significant geothermal resource potential due to its widespread hot spring outcrops and active volcanic activity. However, the presence of magma chambers in the crust and the substantial crustal heterogeneity in this area make the analysis of regional thermal structures challenging. To systematically investigate the contributions of the crust, mantle, and magma chamber systems to the thermal sources across the Changbai Mountain region, this study conducts a three-dimensional thermal conduction simulation based on the three-dimensional heat conduction equation and calculates the thermal structures in different subregions. The results reveal that the surface heat flow in the Changbai Mountain region ranges from 70.1 to 130.8 mW/m², with an average heat flow of approximately 86.2 mW/m². The crust contributes a heat flow ranging from 20.8 to 33.1 mW/m², averaging about 27.7 mW/m², while the mantle contributes 48.3 to 70.1 mW/m², averaging approximately 56.7 mW/m², indicating a typical "cold crust-hot mantle" geothermal system. The thermal contribution from magma chambers shows strong regional characteristics, primarily influencing heat flow within the magma chamber distribution zones and their peripheral boundaries extending approximately 40 km. Within the magma chamber zones, their contribution to regional heat flow ranges from 53.1 to 12.3 mW/m², decreasing to 12.3–1.1 mW/m² within the 40 km boundary extension. In other areas, the thermal contribution from magma chambers is negligible (close to 0 mW/m²). |