Crustal thinning and extension in the northwestern continental margin of the South China Sea

2015 ◽  
Vol 51 ◽  
pp. 286-303 ◽  
Author(s):  
Junjiang Zhu ◽  
Jian Li ◽  
Zongxun Sun ◽  
Sanzhong Li
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Crustal Thinning

Crustal Thinning of the Northern Continental Margin of the South China Sea

2004 ◽  
Vol 25 (1-2) ◽  
pp. 63-78 ◽  
Author(s):  
Ching-Hui Tsai ◽  
Shu-Kun Hsu ◽  
Yi-Ching Yeh ◽  
Chao-Shing Lee ◽  
Kanyuan Xia
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Crustal Thinning

scholarly journals Distribution of the Mesozoic in the continental margin basins of the South China Sea and its petroliferous significance

2014 ◽  
Vol 41 (4) ◽  
pp. 545-552 ◽  
Author(s):  
Baoliang LU ◽  
Pujun WANG ◽  
Jingfu WU ◽  
Wuzhi LI ◽  
Wanyin WANG ◽  
...  
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea

scholarly journals Geological Characteristics of Mud Volcanoes and Diapirs in the Northern Continental Margin of the South China Sea: Implications for the Mechanisms Controlling the Genesis of Fluid Leakage Structures

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Siling Zhong ◽  
Jinfeng Zhang ◽  
Junsheng Luo ◽  
Yajuan Yuan ◽  
Pibo Su
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
Sedimentary Basins ◽  
The South China Sea ◽  
Strong Impact ◽  
Mud Volcanoes ◽  
The South ◽  
China Sea ◽  
Fluid Leakage

Mud volcanoes and diapirs are geological structures formed due to arch piercing or diapiric intrusion of ductile sedimentary materials into the overlying strata along high permeability channels. A detailed study on the processes controlling the formation of mud volcanoes and diapirs in the northern continental margin of the South China Sea is of vital importance to the exploration of economically viable oil and gas reservoirs and can be helpful to the exploration of natural gas hydrate in a sedimentary basin. The fluid seepage structures that occur in the Mesozoic and Cenozoic sedimentary basins of the northern South China Sea show significant differences in their morphological and tectono-structural characteristics. We used high-resolution seismic profiles and instantaneous frequency profiles to understand the mechanisms that are critical with respect to the differential development of the investigated piercement structures. Differences in stress field do not directly lead to the difference in the scale of mud volcanoes or diapirs. Fractures may play an important role in the formation of mud volcanoes and diapirs. The thickness of the sediment was found to have a strong impact on the formation of fluid leakage structures that thicker sediments are more conducive to the development of mud diapirs and the thinner one is more likely to form mud volcanoes.

scholarly journals The role of magmatism in the thinning and breakup of the South China Sea continental margin

2019 ◽  
Vol 6 (5) ◽  
pp. 871-876 ◽  
Author(s):  
Zhen Sun ◽  
Jian Lin ◽  
Ning Qiu ◽  
Zhimin Jian ◽  
PinXian Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea

scholarly journals Mesozoic Northward Subduction Along the SE Asian Continental Margin Inferred from Magmatic Records in the South China Sea

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 598 ◽  
Author(s):  
Guanqiang Cai ◽  
Zhifeng Wan ◽  
Yongjian Yao ◽  
Lifeng Zhong ◽  
Hao Zheng ◽  
...  
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
Oceanic Lithosphere ◽  
The South China Sea ◽  
The South ◽  
Late Mesozoic ◽  
China Sea ◽  
Depleted Mantle ◽  
T Values

During the Mesozoic, Southeast (SE) Asia (including South China and the South China Sea (SCS)) was located in a transitional area between the Tethyan and Pacific geotectonic regimes. However, it is unclear whether geodynamic processes in the SE Asian continental margin were controlled by Tethyan or paleo-Pacific Ocean subduction. Herein, we report ~124 Ma adakitic granodiorites and Nb-enriched basalts from the Xiaozhenzhu Seamount of the SCS. Granodiorites have relatively high Sr/Y (34.7–37.0) and (La/Yb)N (13.8–15.7) ratios, as well as low Y (9.67–9.90 μg/g) and Yb (0.93–0.94 μg/g) concentrations, typical of adakites. Their Sr/Y and (La/Yb)N values coupled with their relatively low initial 87Sr/86Sr ratios (0.70541–0.70551), relatively high K2O contents (3.31–3.38 wt%), high Th/La ratios (0.33–0.40), negative εNd(t) values (−3.62 to −3.52), and their variable zircon εHf(t) values (−3.8 to +5.2) indicate that these rocks were formed by melting of subducted oceanic crust and sediments. The Nb-enriched basalts show enrichment in high field strength elements (HFSE) and have εNd(t) values of +2.90 to +2.93, as well as relatively low initial 87Sr/86Sr ratios of 0.70341–0.70343, demonstrating that they were derived from a depleted-mantle (DM) source metasomatized by silicate magmas originating from melting of a subducted oceanic lithospheric slab. By combining our findings with data from other Late Mesozoic arc-related magmatic rocks and adakites from the broader study area, we propose a geotectonic model involving subduction of young oceanic lithosphere during the Late Jurassic and northward subduction of the proto-South China Sea (PSCS) along the SE Asian continental margin during the Early Cretaceous. This conceptual model better explains the two-period Mesozoic magmatism, commonly reported for the SE Asian continental margin.

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