Geophysical features of mud volcanoes in the waters southwest of the Dongsha Islands

Yan Pin; Wang Yanlin; Zheng Hongbo; Zou Dapeng; Chen Zhong

doi:10.3969/j.issn.0253-4193.2014.04.016

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Yan Pin, Wang Yanlin, Zheng Hongbo, Zou Dapeng, Chen Zhong. Geophysical features of mud volcanoes in the waters southwest of the Dongsha Islands[J]. Haiyang Xuebao, 2014, 36(7): 142-148. doi: 10.3969/j.issn.0253-4193.2014.04.016

Citation:

Yan Pin, Wang Yanlin, Zheng Hongbo, Zou Dapeng, Chen Zhong. Geophysical features of mud volcanoes in the waters southwest of the Dongsha Islands[J]. Haiyang Xuebao, 2014, 36(7): 142-148. doi: 10.3969/j.issn.0253-4193.2014.04.016

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Geophysical features of mud volcanoes in the waters southwest of the Dongsha Islands

doi: 10.3969/j.issn.0253-4193.2014.04.016

1.
CAS Key Laboratory for Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Key Laboratorg of Marine Hydrocarbon Resouras and Environment Geology, Ministry of Land and Resources, Qingdao 266071, China;CAS Guangzhou Center for Gas Hydrates Research, Chinese Academy of Sciences, Guangzhou 510640, China
2.
CAS Guangzhou Center for Gas Hydrates Research, Chinese Academy of Sciences, Guangzhou 510640, China;Faculty of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510090, China

Received Date: 2013-04-01
Rev Recd Date: 2013-08-10

Abstract

Abstract

There exist a series of submarine mounds (50 to 100 m higher above the surrounding seafloor) on the deepwater (600 to 1000 m) slope area between the southwestern Dongsha Islands and the eastern Baiyun sag, revealed by some Multi-channel seismic reflection and CHIRP subbottom profiles. The strata within these mounds have suffered folding and showed chaotic or weak reflections and seriously acoustic masking effects. CHIRP subbottom profiles also showed gas plumes up to 50 m have been developed within the mounds, which reflect there may exist ongoing muddy volcanism. Sedimentary studies showed that some biogenic carbonate nodules distributed on the surface of the mounds. Based on evidences mentioned above, it can be inferred that these mounds southwest of Dongsha Islands are mud volcanoes which may be an important prospecting area for gas hydrates. These mud volcanoes showed characteristics of tectonically compression and banded distribution, which are different from gas hydrate-bearing non-mud volcanoes in the Shenhu area and the Jiulong Methane Reef area and mud volcanoes in other typical passive continental margins in the world. The origin and the potential for gas hydrates of the mounds southwest Dongsha islands are still in debate, and need to be further studied.
- southwest slope of the Dongsha Islands,
- CHIRP subbottom profile,
- mud volcano,
- carbonate nodules,
- gas hydrates

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References(35)

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