New Insights into Crust and upper Mantle Structure in Guangdong Province, China and Its Geothermal Implications

Energies

Xiangyun Hu¹  Jian Kuang²  Shihua Qi² 

[1] Hubei Subsurface Multiscale Imaging Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;

关键词: magnetotellurics;    2D inversion;    crust-upper mantle structure;    Late Mesozoic granite;    geothermal energy;    Guangdong Province;   

DOI  :  10.3390/en14082236

来源: DOAJ

【 摘 要 】

Southeast Asia contains significant natural geothermal resources. However, the mechanism for generating geothermal anomalies by the crust–mantle structure still needs to define. In this study, we focused on Guangdong Province, China. We conducted three magnetotelluric profiles to interpret the crust and upper mantle structure beneath the Guangdong Province and its geothermal implications. Based on data analysis results, a two-dimension inversion was conducted on the dataset. The inversion model revealed that there is a presence of upwelling channels, and some channels are connected with shallow crustal fault zone; the thickness of crust and lithosphere in Guangdong Province is relatively thin. Such a special crust and upper mantle structure form high surface heat flow. Merged with previous research, our results imply that massive Late Mesozoic granites, which contain high radioactive heat generating elements, are distributed on the surface and underground of Guangdong Province. Based on the correlation between high radioactive Late Mesozoic granites, crust-upper mantle structure, surface heat flow, and locations of natural hot springs, we established a geothermal conceptual model to visualize the origin of a current geophysical and geothermal anomaly in Guangdong Province.

【 授权许可】

Unknown