A Note on Gas Hydrate in the Northern Sector of the South China Sea

McDonnell, S.L; Czarnecki, M.

doi:10.1007/978-94-011-4387-5_19

Cited by 3 publications

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“…These sediments are a continuing source to form gas hydrates at the site (Guo et al 2004). There are three areas in the SCS with potential gas hydrate deposits: northwestern continental shelf and slope, Dongsha Rise and Manila Trench in Bijianan Basin (Figure 1) (McDonnell and Czarnecki 2000;Wu et al 2005).…”

Section: Introduction To the South China Seamentioning

confidence: 99%

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Microbial Diversity in the Deep Marine Sediments from the Qiongdongnan Basin in South China Sea

Jiang

Dong

et al. 2007

Geomicrobiology Journal

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The continental shelf and slope in the northern South China Sea is well known for its prospect of oil/gas/gas-hydrate resources. To study microbial communities and their roles in carbon cycling, a 4.9-m sediment core was collected from the Qiongdongnan Basin on the continental slope of the South China Sea during our cruise HY4-2005-5 in 2005. Geochemical, mineralogical, and molecular phylogenetic analyses were carried out. Sulfate concentration in pore water decreased with depth. Abundant authigenic carbonates and pyrite were observed in the sediments. The bacterial community was dominated by aerobic and facultative organisms. Bacterial clone sequences belonged to the Gamma-, Alpha-, Deltaproteobacteria and Firmicutes group, and they were related to Fe(III) and/or Mn(IV) reducers, sulfate reducers, aromatic hydrocarbon degraders, thiosulfate/sulfite oxidizers, and denitrifiers. Archaeal clone sequences exhibited greater overall diversity than the bacterial clones with most sequences related to Deep-Sea Archaeal Group (DSAG), Miscellaneous Crenarchaeotic Group (MCG), and Uncultured Euryarchaeotic Clusters (UECs). Archaeal sequences related to Methanosarcinales, South African Gold Mine Euryarchaeotic Group (SAGMEG), Marine Benthic Group-D (MBG-D) were also present. Most of these groups are commonly present in deep-sea sediments, particularly in methane/organicrich or putative methane hydrate-bearing sediments.

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Section: Introduction To the South China Seamentioning

confidence: 99%

“…The South China Sea is a site with potential gas hydrate deposits (McDonnell and Czarnecki 2000;Guo et al 2004). The SCS is located at the junction of three tectonic plates: the Eurasian, the Pacific and the Indian-Australian.…”

Section: Introduction To the South China Seamentioning

confidence: 99%

Microbial Diversity in the Deep Marine Sediments from the Qiongdongnan Basin in South China Sea

Jiang

Dong

et al. 2007

Geomicrobiology Journal

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“…The evidences for gas hydrates or deep water oil (gas) reservoirs and the relationship between authigenic mineral, geochemistry of pore waters, and methane seep in shallow sediments were discussed here. Oil-and gas-bearing depositional basins on the northern continental slope of the South China Sea were developed during the late Cenozoic [10][11][12], when a strong extrusion phase followed a period of rift extension and sea-floor spreading 30∼24 Ma ago. The area (Figure 1) is characterized by frequent tectonic and magmatic episodes, slope slumps, high heat flux (average about 75 mW/m 2 ), abundant thermogenic gas and biogas in shallow sediments, carbon dioxide and nitrogen-rich gas.…”

Section: Introductionmentioning

confidence: 99%

Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea

et al. 2011

Journal of Geological Research

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Several authigenic minerals were identified by XRD and SEM analyses in shallow sediments from the Southeast Hainan Basin, on the northern slope of South China Sea. These minerals include miscellaneous carbonates, sulphates, and framboidal pyrite, and this mineral assemblage indicates the existence of gas hydrates and a methane seep. The assemblage and fabric features of the minerals are similar to those identified in cold-seep sediments, which are thought to be related to microorganisms fostered by dissolved methane. Chemical composition of pore water shows that the concentrations of SO 2− 4 , Ca 2+ , Mg 2+ , and Sr 2+ decrease clearly, and the ratios of Mg 2+ to Ca 2+ and Sr 2+ to Ca 2+ increase sharply with depth. These geochemical properties are similar to those where gas hydrates occur in the world. All results seem to indicate clearly the presence of gas hydrates or deep water oil (gas) reservoirs underneath the seafloor.

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Secrets of Bermuda Triangle and Formation of Polymetallic Nodules

Joseph

2017

Investigating Seafloors and Oceans

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A Note on Gas Hydrate in the Northern Sector of the South China Sea

Cited by 3 publications

References 0 publications

Microbial Diversity in the Deep Marine Sediments from the Qiongdongnan Basin in South China Sea

Microbial Diversity in the Deep Marine Sediments from the Qiongdongnan Basin in South China Sea

Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea

Secrets of Bermuda Triangle and Formation of Polymetallic Nodules

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