Submarine volcanism in the southern margin of the South China Sea

Chenglong ZHANG; Shaohong XIA; Chaoyan FAN; Jinghe CAO

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Submarine volcanism in the southern margin of the South China Sea

Geomorphology and geological structure of South China Sea | Updated：2024-10-12

- Submarine volcanism in the southern margin of the South China Sea
- Journal of Oceanology and Limnology Vol. 41, Issue 2, Pages: 612-629(2023)
- Affiliations：
  
  1.CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  shxia@scsio.ac.cn
- Funds：
- DOI：
  CLC：
- Received：01 March 2022，
  
  Published：01 March 2023
- Accepted：
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ZHANG Chenglong,XIA Shaohong,FAN Chaoyan,et al.Submarine volcanism in the southern margin of the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):612-629.
DOI：

ZHANG Chenglong,XIA Shaohong,FAN Chaoyan,et al.Submarine volcanism in the southern margin of the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):612-629. DOI：

摘要

Abstract

Submarine volcanism is widely developed in the South China Sea (SCS). However

the characteristics

distribution

and genesis of submarine volcanoes in the southern margin of the SCS remain obscure. In this study

we analyzed the characteristics of submarine volcanoes and identified a total of 43 submarine volcanoes in the southern margin of the SCS

based on a newly acquired 310-km seismic reflection profile

along with previous 45 multi-channel seismic (MCS) profiles

petrological results from volcanic rocks sampled by dredging and drilling

nearby ocean bottom seismometer (OBS) wide-angle seismic profiles

and gravity and magnetic data. The study ascertains that most of these volcanoes are located in fault-block belts and graben-horst zones with strong crustal stretching and thinning. These volcanoes exhibit positive high-amplitude external seismic reflections

weak and chaotic internal seismic reflections

and are accompanied by local deformation of the surrounding sedimentary strata. Meanwhile

they have higher positive gravity anomalies and higher magnetic anomalies than the background strata. The petrological dating results show that volcanic ages are primarily in the Pliocene-Pleistocene

with geochemical characteristics indicating dominance of oceanic island basalt (OIB)-type alkali-basalts. Extensional faults have obviously spatial correspondence with post-spreading volcanism

suggesting these faults may provide conduits for submarine volcanism. The high-velocity bodies (HVBs) in the lower crust and magma underplating exist in the southern SCS

which could provide a clue of genesis for submarine volcanism. The inference is that the intensity of post-spreading volcanism in the southern margin might be affected by stretching faults

crustal thinning and magma underplating.

关键词

Keywords

references

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