东沙西南海区泥火山的分布及其物质来源层位*

doi:10.11978/2015138

Abstract

Abstract: A few mud volcanoes were found in the Dongsha waters according to reconnaissance multi-channel seismic (MCS) and Chirp sub-bottom profiles. Denser MCS and sub-bottom survey lines were run in the area in 2014. Blanking zones under submarine mounds and rimmed depression were revealed by the MCS section, while locally enhanced seafloor reflection and gas plumes, by Chirp sub-bottom data. Correlation of MCS profiles and sub-bottom profiles shows these mud volcanoes sit in the NWW-SEE. The largest mud volcano there is ~15 km long, ~8 km wide, and ~285 m high. The steep slopes of mud volcanoes ranged from 5.5° to 15.9°. Correlated with the interpreted MCS profiles nearby, the provenance strata of some mud volcanoes there is of Mesozoic, considering that the tectonic deformation and reflection blanking zone under mud volcanoes extends at least 5.5 km below seafloor.

Key words: southwest of the Dongsha Islands, mud volcano, multi-channel seismic, sub-bottom profile, Mesozoic

ZHAO Xu, YAN Pin, WANG Yanlin, ZHENG Hongbo. The distribution and provenance strata of mud volcanoes in the waters southwest of the Dongsha Islands[J].Journal of Tropical Oceanography, 2016, 35(5): 88-96.

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The distribution and provenance strata of mud volcanoes in the waters southwest of the Dongsha Islands

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