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Geothermal structurerevealed by Curie isothermal surface under Guangdong province, China

Yufei Xi*1,2, Yabo Zhao3,David A.Yuen4,5,6, Shuang Liu2,7, Xiangyun Hu7
1 .Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences.Shijiazhuang 050061, Hebei,China;2.2.Institute of Geology and Geophysics, Chinese Academy of Sciences. Beijing 100029,China;3.Faculty of Information Engineering,China University of Geosciences,Wuhan 430074,Hubei, China;4 4.School of Environmental Studies, China University of Geosciences,Wuhan 430074,Hubei, China 5. .Department of Earth Sciences and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis MN 55455, USA;6.Wuhan Industrial Technology Research Institute of Geo-Resources and Environment Corporation, Wuhan,430074,Hubei, China;7.Institute of Geophysics and Geomatics, China University of Geosciences,Wuhan 430074,Hubei, China

ABSTRACT: Guangdong province in Southeast China is noted for numerous geothermal resources due to past tectonic episodes,mainly during the Cretaceous. The surface heat flow and geothermal gradient, the most direct ways to understand the temperature of the Earth, are poorly constrainedin Guangdong province due to limited numbers of boreholes and surficialhydrothermal fluids. To improve the understanding oftemperatures under Guangdong province, we have applied power-density spectral analysis to aeromagnetic anomaly data in order to calculate the depth of the Curie isothermal surface. The calculated Curie isotherm is between 18.5 km-22 km. The undulation reflects lateral thermal perturbations in theGuangdong crust. In particular, the eastern, northern, westernand coastline areas of the province are underlain by a relatively shallow Curie isotherm. We compare the surface heat flow, geothermal gradient, distribution of Mesozoic granite-volcanic rocks, andnatural warm springs, and conclude that Mesozoic, magmatism exerted great influence on thedeep thermal state of Guangdong province. A shallow Curie isotherm surface, as well as numerous natural warm springs and high heat flow, show clear signatures of  shallowheat sources.

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Keywords:Curie isotherm surface; Spectrum analysis; Geothermal structure; Guangdong province

DOI:
10.1007/s12583-017-0967-6
CLC number:
U469.72
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