Characterization of fine-grained turbidite deposits from the South China Sea sediment cores

AbstractCucullanus hainanensis sp. nov., collected from Muraenichthys gymnopterus (Bleeker) (Anguilliformes: Ophichthidae) in the South China Sea, was described using both light and scanning electron microscopy. The new species can be readily distinguished from its congeners by the large pseudobuccal capsule, the position of excretory pore and deirids, the length of spicules (0.64–0.76 mm, 5.84–6.67% of body length) and gubernaculum (0.21–0.24 mm), the number and arrangement of caudal papillae and the particular morphology of cloacal region in male. The new species was also characterized using molecular methods by sequencing and analysing the small subunit (18S) and the second internal transcribed spacer (ITS-2) of nuclear ribosomal DNA (rDNA). In addition, Cucullanus muraenesocis (Yin et Zhang, 1983) was regarded a homonym of C. muraenesocis Yamaguti, 1961, and a new name, Cucullanus wangi nom. nov. was given to it.

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Characterization of bacterial diversity associated with deep sea ferromanganese nodules from the South China Sea

The Journal of Microbiology ◽

10.1007/s12275-015-5217-y ◽

2015 ◽

Vol 53 (9) ◽

pp. 598-605 ◽

Cited By ~ 9

Author(s):

De-Chao Zhang ◽

Yan-Xia Liu ◽

Xin-Zheng Li

Keyword(s):

South China Sea ◽

Bacterial Diversity ◽

South China ◽

Deep Sea ◽

The South China Sea ◽

The South ◽

Ferromanganese Nodules ◽

China Sea

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Undrained triaxial tests on water-saturated methane hydrate-bearing clayey-silty sediments of the South China Sea

Canadian Geotechnical Journal ◽

10.1139/cgj-2019-0711 ◽

2020 ◽

Cited By ~ 2

Author(s):

Lei Wang ◽

Yanghui Li ◽

Shi Shen ◽

Tao Liu ◽

Weiguo Liu ◽

...

Keyword(s):

South China Sea ◽

South China ◽

Gas Hydrate ◽

Methane Hydrate ◽

The South China Sea ◽

The South ◽

China Sea ◽

Fine Grained ◽

Hydrate Saturation ◽

Water Saturated

Approximately 90% of gas hydrates are buried in fine-grained sediments on earth, especially in the South China Sea. The potential instability of the fine-grained sediments induced by hydrate dissociation requires us to investigate the shear strength and pore pressure response of the sediments during the hydrate recovery. To date, most of studies focused on the undrained mechanical behavior of gas hydrate-bearing sand or gas hydrate-free clay, and few studies examined gas hydrate-bearing fine-grained sediments. According to the low-permeability and water-saturated characteristics of the sediments in the South China Sea, we performed a series of undrained triaxial shear tests on water-saturated methane hydrate-bearing clayey-silty sediments in this area. The experiment results show that the failure strength of methane hydrate-bearing sediments (MHBSs) increases with the increase in hydrate saturation and initial effective mean stress. The excess pore water pressure of MHBSs remains positive during shear. The cohesion in Mohr-Coulomb model increases with the increase in hydrate saturation, while the internal friction angle in Mohr-Coulomb model has little dependence on the hydrate saturation.

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