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geothermal structure revealed by curie isothermal surface under Guangdong Province,China

Journal of Groundwater Science and Engineering 2021年第2期9卷 114-120页

作者： Yu-fei Xi Ya-bo Zhao DA Yuen Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center of geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China Faculty of Information Engineering China University of GeosciencesWuhan 430074China Department of Applied Physics and Applied Mathematics Columbia UniversityNew York 10027USA

Guangdong Province in Southeast China is noted for its numerous geothermal resources due to tectonic episodes,mainly occurred during the *** surface heat flow and geothermal gradient are the most direct ways to understand the temperature of the ***,geothermal resources are poorly utilized in Guangdong Province due to limited numbers of boreholes and surficial hydrothermal *** improve the understanding of underground temperature distribution in Guangdong Province,we have applied power-density spectral analysis to aeromagnetic anomaly data to calculate the depth of the Curie isothermal *** continuation is applied and tested to the magnetic *** calculated Curie isotherm is between 18.5 km and 25 km below *** fluctuation in the depth range reflects lateral thermal perturbations in the Guangdong *** particular,the eastern,northern,western and coastline areas of the province have a relatively shallow Curie *** comparing the surface heat flow,geothermal gradient,distribution of Mesozoic granite-volcanic rocks,and natural hot springs,we conclude that during Mesozoic,magmatism exerted great influence on the deep thermal state of Guangdong Province.A shallow Curie isotherm surface,as well as numerous natural hot springs and high heat flow,show clear signatures of shallow heat sources.

关键词： Curie isotherm surface geothermal structure Spectrum analysis Guangdong Province

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Postrift Rapid Subsidence Characters in Qiongdongnan Basin,South China Sea

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Journal of Earth Science 2011年第2期22卷 273-279页

作者：尹新义任建业雷超王珊张俊霞 Faculty of Earth Resources China University of Geosciences Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of Education School of Economics and Management China University of Geosciences

In this article,the backstripping technique was used in studying the subsidence charac-ters of the Qiongdongnan（琼东南） basin（QDNB） in order to understand its dynamic mechanism of formation and ***,the geothermal characteristics of this area were summarized,and the stretching factors（β） of the upper crust,the whole crust,and the whole lithosphere were *** QDNB is characterized by high subsidence rate,high geothermal gradient,high geothermal heat flow,and the lithosphere stretching and thinning of this area are depth *** asthenosphere zone must have been confined under the lithosphere of Southeast Asian continent because of the mutual subductions of the Eurasian plate,the Pacific plate,the Indian-Australian plate,and the Philippine Sea *** characters indicate that strong mantle convection occurred and the lower crust materials flowed away in the domain,which lead to the rapid flexural isostasy subsidence of the upper crust and the uplift of the asthenosphere.

关键词： Qiongdongnan basin tectonic subsidence geothermal structure stretching factor,lower-crustal flow.

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Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt,Eastern China

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Journal of China University of Geosciences 2008年第3期19卷 282-291页

作者：乔庆庆刘庆生邱宁付媛媛赵素涛吴耀杨涛金振民 Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029 China Institute of Geophysics & Geomatics China University of Geosciences Wuhan 430074 China Institute of Geophysics & Geomatics China University of GeosciencesWuhan 430074 China School of Earth and Space Sciences Peking UniversityBeijing 100871 China Faculty of Earth Sciences China University of GeosciencesWuhan 430074 China

The Curie point depth of continental crust can reflect the regional tectonic pattern and geothermal structures. Analysis of magnetism is an efficient way to obtain the Curie point depth on a regional scale. This study systematically investigated the Curie point depth of Sulu （苏鲁） ultrahigh pressure （UHP） metamorphic belt （33°40＇N to 36°20＇N and 118°E to 120°E, ca. 60 000 km^2）, eastern China using aeromagnetic data. The results show that the Curie point depth of the Sulu region varies from 18.5 to 27 km. The shallowest Curie point depth （ca. 18.5 km） is located in Subei （苏北） subsidence, where the estimated temperature gradient value is about 31.35℃/km, which is comparable with the measured value of 30 ℃/km. In addition, a two-dimensional numerical solution of the heat conduction was used to calculate the temperature field to a depth of 30 km along the profile from Tancheng （郯城） to Lianshui （涟水） with a length of 139 km. The steady state model solved using the finite element method shows that the temperature around the Curie point depth is about 585.36 ℃, which is close to the Curie temperature （580℃） of magnetite at atmospheric pressure. These results provide new insights into the tectonic and continuous thermal structures of the Sulu UHP metamorphic belt.

关键词： aeromagnetic anomaly Curie point geothermal structure Sulu UHP metamorphic belt.

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Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt,Eastern China

Investigation of Curie Point Depth in Sulu Ultrahigh-Pressur...

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中国科学院地质与地球物理研究所2008学术年会

作者：乔庆庆刘庆生邱宁付媛媛赵素涛吴耀杨涛金振民 Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geophysics ＆ Geomatics China University of Geosciences School of Earth and Space Sciences Peking University Faculty of Earth Sciences China University of Geosciences

The Curie point depth of continental crust can reflect the regional tectonic pattern and geothermal *** of magnetism is an efficient way to obtain the Curie point depth on a regional *** study systematically investigated the Curie point depth of Sulu(苏鲁) ultrahigh pressure(UHP) metamorphic belt(33°40’N to 36°20’N and 118°E to 120°E,ca.60 000 km),eastern China using aeromagnetic *** results show that the Curie point depth of the Sulu region varies from 18.5 to 27 *** shallowest Curie point depth(ca.18.5 km) is located in Subei(苏北) subsidence, where the estimated temperature gradient value is about 31.35℃/km,which is comparable with the measured value of 30℃/*** addition,a two-dimensional numerical solution of the heat conduction was used to calculate the temperature field to a depth of 30 km along the profile from Tancheng(郯城) to Lianshui(涟水) with a length of 139 *** steady state model solved using the finite element method shows that the temperature around the Curie point depth is about 585.36℃,which is close to the Curie temperature(580℃) of magnetite at atmospheric *** results provide new insights into the tectonic and continuous thermal structures of the Sulu UHP metamorphic belt.

关键词： aeromagnetic anomaly Curie point geothermal structure Sulu UHP metamorphic belt

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