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Cooling of the lithosphere beneath the Nansha Block, South China Sea
Dong, Miao1,2; Zhang, Jian1; Wu, Shi-Guo1,2,3; Wang, Bei-Yu1; Ai, Yi-Fei1
2019-03-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume171Pages:169-177
AbstractThroughout the Late Cretaceous and Cenozoic, the Nansha Block experienced stretching and extension and moved southwards away from the South China continent. As an exotic micro-continent, the Nansha Block has markedly different lithospheric rheological properties from its surrounding regions. The temperature represents one of the key parameters controlling the dynamics and rheological behaviors of the lithosphere and mantle. Therefore, we calculated the 3D temperature field of the crust and upper mantle beneath the Nansha Block using two methods, namely, solving the heat conduction equation and inverting the S-wave velocity structure. The results show that the ratio of the crustal heat flow to the seafloor heat flow is greater than 50% in the central Nansha Block. The crustal temperatures in the Nansha Block are low. The temperature at the Moho discontinuity is approximately equal to the Curie temperature (523 degrees C). The temperatures of the shallow mantle (50 km) beneath the Nansha Block (800 degrees C) are lower than those of the surrounding areas. However, the cool mantle below the Nansha Block gradually transitions into a warm mantle with increasing depth. At a depth of 150 Km, the mantle temperatures beneath the Nansha Block (1600 degrees C) are higher than those of the surrounding areas. The bottom boundary of the "thermal" lithosphere beneath the Nansha Block is at approximately 100 km, which is deeper than that in the surrounding areas. This result is different from the bottom boundary of the "seismic" lithosphere at a depth of 80 km under the Nansha Block, which is similar to that in the surrounding areas. The low lithospheric temperatures beneath the Nansha Block imply that the lithosphere of the Nansha Block experienced a rapid cooling process.
KeywordNansha Lithosphere Temperature Heat flow Seismic wave velocity
DOI10.1016/j.jseaes.2018.06.007
Funding OrganizationNational Natural Science Foundation of China ; CAS-SAFEA International Partnership Program for Creative Research Teams
Language英语
Funding ProjectNational Natural Science Foundation of China[41574074] ; National Natural Science Foundation of China[U1701245] ; National Natural Science Foundation of China[91428205] ; CAS-SAFEA International Partnership Program for Creative Research Teams[KZZD-EW-TZ-19]
WOS KeywordCURIE-POINT DEPTH ; HEAT-FLOW ; THERMAL STRUCTURE ; MANTLE TEMPERATURES ; CONTINENTAL-MARGIN ; DANGEROUS GROUNDS ; EVOLUTION ; THICKNESS ; CONSTRAINTS ; VELOCITY
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000460709300014
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/6663
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorZhang, Jian
Affiliation1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Lab Marine Geophys & Georesources, Inst Deep Sea Sci & Engn, Sanyo 572000, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
Recommended Citation
GB/T 7714
Dong, Miao,Zhang, Jian,Wu, Shi-Guo,et al. Cooling of the lithosphere beneath the Nansha Block, South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,171:169-177.
APA Dong, Miao,Zhang, Jian,Wu, Shi-Guo,Wang, Bei-Yu,&Ai, Yi-Fei.(2019).Cooling of the lithosphere beneath the Nansha Block, South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,171,169-177.
MLA Dong, Miao,et al."Cooling of the lithosphere beneath the Nansha Block, South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 171(2019):169-177.
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