Characteristics and genesis of the geothermal field in the northern margin of the South China Sea

LI Shou-jun

doi:10.3969/j.issn.1001-909X.2014.04.002

PDF(2717 KB)

Journal of Marine Sciences ›› 2014, Vol. 32 ›› Issue (4) : 11-18. DOI: 10.3969/j.issn.1001-909X.2014.04.002

Characteristics and genesis of the geothermal field in the northern margin of the South China Sea

LI Shou-jun^1,2,3

Author information +

History +

Abstract

With the statistic results about a total number of 462 heat flow values and geothermal gradient values, the present geothermal field in the northern margin of the South China Sea is characterized with “general higher heat flow values and higher geothermal gradient values”. The heat flow values increase from continental shelf to ocean basin against the trend of the crust thickness and Moho depth. Thermal Curie Point Isotherm (the 575 ℃ isotherm) was obtained according to the static geothermal temperature field calculated from the heat flow and geothermal gradient survey data. Magnetic Curie Point Isotherm was obtained by inversion of the magnetic anomalies. The results show that the two Curie Point Isotherms derived respectively from the prior two methods are inconsistent with significant differences in the middle and lower slope in the northern margin of the South China Sea. The Magnetic Curie Point Isotherm is above the Thermal Curie Point Isotherm between fault F2 and fault F4 in the integrated profiles of OBS93 and ESP-E, which means that some magma under-plating events caused the thermal disequilibrium in this region. Based on the study of the crust structure, crust expansion coefficient, Moho depth, faults and magma activities, the author points out that the variation trend of the heat flow values in the northern margin of the South China Sea is controlled by the magnitude of the lithosphere thinning and Moho uplifting. The magma activities during the Neo-tectonic period might be a factor for the local heat flow anomaly.

Key words

northern margin of the South China Sea / Magnetic Curie Point / Thermal Curie Point / crust expansion coefficient / Moho depth / magma under-plating

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Shou-jun. Characteristics and genesis of the geothermal field in the northern margin of the South China Sea[J]. Journal of Marine Sciences. 2014, 32(4): 11-18 https://doi.org/10.3969/j.issn.1001-909X.2014.04.002

References

[1] HUANG Ci-liu, ZHONG Jian-qiang. Tectonic events in the cenozoic era in the northeast area of South China Sea and its neighboring regions[J]. Journal of Tropical Oceanography,1994,13(1):55-62.
黄慈流,钟建强.南海东北部及其邻区新生代构造事件[J].热带海洋,1994,13(1):55-62.
[2] LI Jia-biao. Evolution of China’s marginal seas and its effect of natural resources[M].Beijing: Ocean Press,2008:220-246.
李家彪.中国边缘海形成演化与资源效应[M].北京:海洋出版社,2008:220-246.
[3] LI Si-tian, LIN Chang-song, ZHANG Qi-ming, et al. Dynamic process of continental basin episodic tectonic subsidence and tectonic events since 10 Ma in the northern margin of South China Sea[J]. Chinese Science Bulletin,1998,43(8):797-810.
李思田,林畅松,张启明,等.南海北部大陆边缘盆地幕式裂陷的动力过程及10 Ma以来的构造事件[J].科学通报,1998,43(8):797-810.
[4] SIBUET J C, HSU S K. Geodynamics of the Taiwan arc-arc collision[J]. Tectonophysics,1997,274(1-3):221-251.
[5] SIBUET J C, HSU S K, Le PICHON X,et al. East Asia plate tectonics since 15 Ma:constraints from the Taiwan region[J]. Tectonophysics,2002,344(1-2):103-134.
[6] MI Li-jun, YUAN Yu-song, ZHANG Gong-cheng, et al. Characteristics and genesis of geothermal field in deep-water area of the northern South China Sea[J]. ACTA Petrol EI Sinica,2009,30(1):29-32.
米立军,袁玉松,张功成,等.南海北部深水区地热特征及其成因[J].石油学报.2009,30(1):27-32.
[7] XU Xing, SHI Xiao-bin, LUO Xian-hu, et al. Heat flow measurements in the Xisha trough of the South China Sea[J]. Marine Geology and Quaternary Geology,2006,26(4):51-58.
徐行,施小斌,罗贤虎,等. 南海西沙海槽地区的海底热流测量[J].海洋地质与第四纪地质, 2006,26(4):51-58.
[8] ZHANG Jian, WANG Ji-yang. The deep thermal characteristic of continental margin of the northern South China Sea[J]. Chinese Science Bulletin,2000,45(10): 1 095-1 100.
张健,汪集旸. 南海北部大陆边缘深部地热特征[J]. 科学通报,2000,45(10):1 095-1 100.
[9] ZHANG Jian, SONG Hai-bin. The thermal structure of main sedimentary basins in the northern margin of the South China Sea[J]. Journal of Geomechanics,2001,7(3):238-244.
张健,宋海斌. 南海北部大陆架盆地热结构[J]. 地质力学学报. 2001,7(3):238-244.
[10] SHI Xiao-bin, ZHOU Di, ZHANG Yi-xiang. Lithospheric thermo-rheological structure of the northern margin of South China Sea[J]. Chinese Science Bulletin,2000,45(15):1 160-1 165.
施小斌,周蒂,张毅祥.南海北部陆缘岩石圈热流变结构[J].科学通报,2000,45(15):1 160-1 165.
[11] SHI Xiao-bin, QIU Xue-lin, XIA Kan-yuan, et al. Heat flow characteristics and its tectonic significance of South China Sea[J]. Journal of Tropical Oceanography,2003,22(2):63-73.
施小斌,丘学林,夏戡原,等.南海热流特征及其构造意义[J].热带海洋学报,2003,22(2):63-73.
[12] LIU Zhao shu, ZHAO Huan-ting, FAN Shi-qing, et al. Geology of the South China Sea[M]. Beijing: Science Press,2002:284-287.
刘昭蜀,赵焕庭,范时清,等.南海地质[M].北京:科学出版社,2002:284-287.
[13] ZHANG Xun-hua. Tectonic geology in China Sea[M].Beijing : Ocean Press,2008:204-218.
张训华.中国海域构造地质学[M].北京:海洋出版社,2008:204-218.
[14] YAO Bo-chu, WAN Ling. The three dimensional structure of lithosphere and its evolution in the South China Sea[M].Beijing: Geology Press,2006:28-31.
姚伯初,万玲.中国南海海域岩石圈三维结构及演化[M].北京:地质出版社,2006:28-31.
[15] LUAN Xi-wu, LIU Hong, PENG Xue-chao. The geophysical interpretation of a Dongsha ancient uplift on the northern margin of South China Sea[J]. Chinese Journal of Geophysics,2011,54(12):3 217-3 232.
栾锡武,刘鸿,彭学超.南海北部东沙古隆起的综合地球物理解释[J].地球物理学报,2011,54(12):3 217-3 232.
[16] WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, et al. Characteristic of magnetic anomalies and curie point depth at northern continental margin of the South China Sea[J]. Earth Science-Journal of China University of Geosciences,2010,35(6):1 060-1 068.
吴招才,高金耀,赵俐红,等.南海北部陆缘的磁异常特征及居里面深度[J].地球科学—中国地质大学学报,2010,35(6):1 060-1 068.
[17] SUN Jin-long, XU Hui-long, CAO Jing-he. Crustal movement and its dynamic mechanism of the Taiwan-Luzon convergent zone[J]. Chinese Journal of Geophysics,2011,54(12):3 016-3 025.
孙金龙,徐辉龙,曹敬贺.台湾-吕宋汇聚带的地壳运动特征及其动力学机制[J].地球物理学报,2011,54(12):3 016-3 025.
[18] CHEN Han-zong, WU Xiang-jie, ZHOU Di, et al. Meso-Cenozioc faults in Zhujiang river mouth basin and their geodynamic background[J]. Journal of Tropical Oceanography, 2005,24(2): 52-61.
陈汉宗,吴湘杰,周蒂,等.珠江口盆地中新生代主要断裂特征和动力学背景分析[J].热带海洋学报,2005,24(2):52-61.
[19] ZHAO Jun-feng, SHI Xiao-bin, QIU Xue-lin, et al. Characteristics of curie isotherm and its petroleum geological significance in northeast of South China Sea[J]. Journal of Tropical Oceanography,2010,29(1): 126-131.
赵俊峰,施小斌,丘学林,等.南海东北部居里面特征及其石油地质意义[J].热带海洋学报,2010,29(1):126-131.
[20] ZHAO Jun-feng, ZHANG Yi-xiang. Deep structure and genetic model of magnetic quiet zone[J]. Shanghai Geology,2008,107(3):4-7.
赵俊峰,张毅祥.南海东北部磁静区深部构造及成因模式[J].上海地质,2008,107(3):4-7.
[21] ZHOU Di, WANG Wan-yin, PANG Xiong, et al. Mesozoic subducting accretion zone in northeast South China Sea from geophysics data[J]. Science in China(Series D): Earth Sciences(in Chinese),2006,36(3):209-218.
周蒂,王万银,庞雄,等.地球物理资料所揭示的南海东北部中生代俯冲增生带[J].中国科学(D辑):地球科学,2006,36(3):209-218.
[22] HU Deng-ke, ZHOU Di, WU Xiang-jie, et al. Origin of high magnetic anomaly belt in northeastern South China Sea as indicated by geophysical inversion[J]. Journal of Tropical Oceanography,2008,27(1):32-37.
胡登科,周蒂,吴湘杰,等.南海东北部高磁异常带成因的地球物理反演研究[J].热带海洋学报,2008,27(1):32-37.
[23] LIU An, WU Guo-zhong, WU Shi-min. A discussion on the origin of high velocity layer in the lower crust of northeast South China Sea[J]. Geological Review,2008,54(5): 609-616.
刘安,武国忠,吴世敏.南海东北部下地壳高速层的成因探讨[J].地质评论,2008,54(5):609-616.
[24] YAO Bo-chu. Crust structure and its tectonic significance in the northern margin of South China Sea[J]. Marine Geology and Quaternary Geology,1998,18(2): 1-16.
姚伯初.南海北部陆缘的地壳结构及构造意义[J].海洋地质与第四纪地质,1998,18(2):1-16.