IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Spatial distribution of deepwater depositional systems and relationship with bottom currents on the northwestern lower slope of the Northwest Sub-Basin, South China Sea
Xie, X.; Chen, H.; Xie, Y.; Wang, Z.; Yongchao, L.; Ren, J. (2014). Spatial distribution of deepwater depositional systems and relationship with bottom currents on the northwestern lower slope of the Northwest Sub-Basin, South China Sea, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 13-14
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

Available in  Authors 

Keywords
Author keywords
    Deepwater system; Turbidite deposits; Northwest sub-basin

Authors  Top 
  • Xie, X.
  • Chen, H.
  • Xie, Y.
  • Wang, Z.
  • Yongchao, L.
  • Ren, J.

Abstract
    Using 2D seismic data, a complex of deepwater depositional systems consisting of submarine valleys/canyons, wave-shaped sliding deposits, contourite erosive features and sheeted drifts, are developed within the Quaternary strata on the northwestern lower slopes of the Northwestern Sub-Basin, South China Sea. Alongslope aliened erosive features and non-depositional features are observed on the eastern upper gentle slopes (<1500m-depth), where a V-shaped downslope valley presents an apparent ENE migration. These indicate a major eastward bottom current, possibly within the South China Sea Intermediate Water Circulation. Contourite sheeted drifts are also present on the eastern gentle slopes, with water depth >2500m, referring to a wide unfocused bottom current, which might be related to the South China Sea Deep Water Circulation. Sliding deposits are developed on steeper slopes (>2o), where alongslope current deposition is missing. This suggests a domination of downslope depositional processes on unsteady slopes. The NNW-SSE oriented slope morphology changes from a three-step terraced outline (gentle-steep-gentle) in the east of the investigated area, into a two-step terraced (gentlesteep) outline in the middle, and into a unitary steep slope in the west. Such morphological changes possibly lead to the westwards simplifying assemble patterns of the deepwater depositional systems on this margin.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors