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Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea
Wang, Yanlin; Qiu, Yan; Yan, Pin; Zheng, Hongbo; Liu, Hailing; Wang, Jun; Wang, YL (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationTECTONOPHYSICS
Volume677Pages:190-198
AbstractAccording to previous studies, Mesozoic deposits have been unequivocally identified in the northeastern Nansha waters (southern margin of the South China Sea, SCS). Thick lower structural layers in the north Nansha waters have not clearly been identified as either Mesozoic or Cenozoic strata. These strata are characterized by strong top erosion, tilted layer or folded anticlines. New long-offset multi-channel seismic data show refracted phases from the top of the lower structural layer in the northern Nansha waters. A major velocity leap (approximately from 1.6 km/s to 3.8 km/s or 2.9 km/s to 5.3 km/s), calculated from the refraction wave of seismic data, is found across a prominent angular unconformity, indicating a major sedimentary hiatus. According to the stratigraphic characteristics and velocity range of the lower structural layer, velocity leap at the top of lower structural layer and ubiquitous absence of upper Cretaceous strata in the Nansha waters, the lower structural layer of the northern Nansha waters are interpreted as Mesozoic. Based on the similarities in stratigraphic characteristics of the lower structural layers between the northern and central Nansha waters, previous studies from gravity data and multi-channel seismic data, we propose that lower structural layers over central Nansha waters may also Mesozoic. This further suggests that the intensity of upper crustal extension was moderate in Nansha waters during the Cenozoic, which related to a combination of the Cenozoic slab pull of the proto-SCS and lithosphere delamination over an ancient orogenic belt between the northern and southern continental margins of the SCS, which may weaken extension of upper crust over the Nansha waters. (C) 2016 Elsevier B.V. All rights reserved.
Department[Wang, Yanlin; Yan, Pin; Zheng, Hongbo; Liu, Hailing] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China; [Qiu, Yan; Wang, Jun] Guangzhou Marine Geol Survey, POB 1180, Guangzhou 510760, Guangdong, Peoples R China ; 边缘海地质
KeywordNansha Waters Lower Structural Layer Angular Unconformities Velocity Leap Mesozoic Proto-south China Sea
Subject AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15433
Collection中科院边缘海地质重点实验室
Corresponding AuthorWang, YL (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Wang, Yanlin,Qiu, Yan,Yan, Pin,et al. Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea[J]. TECTONOPHYSICS,2016,677:190-198.
APA Wang, Yanlin.,Qiu, Yan.,Yan, Pin.,Zheng, Hongbo.,Liu, Hailing.,...&Wang, YL .(2016).Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea.TECTONOPHYSICS,677,190-198.
MLA Wang, Yanlin,et al."Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea".TECTONOPHYSICS 677(2016):190-198.
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