Depositional Features and Evolution Patterns of the Continental Slope System in the Qiongdongnan Basin, northern South China Sea

• Autores: Cheng Zhang, Junliang Li, Xinong Xie, Yongchao Lu, Tao Jiang
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 11, 2010 (Ejemplar dedicado a: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010), págs. 191-192
• Idioma: inglés
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• Resumen

  • : The depositional architectures and vertical evolutions of the continental slope systems are clearly different in various areas of the Qiongdongnan basin: 1) a progradational slope type, located in the Ledong and Lingshui areas of western Qiongdongnan basin, is mainly characterized by sharply progradational slope clinoforms, resulted in a rapid shift of shelf edges seaward and southeastward; 2) a slumping slope type, developed in the Songtao area abutting against the Lingshui area, shows vertical stacking patterns or slight shifts seaward with slump deposits; 3) a channelized slope type in the Baodao area in the central basin also has a vertical stacking pattern or slight shifts seaward, characterized by prevailing slope channels or canyons; 4) a gentle monocline slope type, located in the Changchang area in the east of this basin, shows a gentle monocline slope. Sediment supply is the primary controlling factor on the geometry of slope clinoforms, although tectonic activity and sea-level change influenced the development of the slope architecture. Plentiful sediment supply leads to rapid progradational slope clinoform at a large distance of progradation in the western Qiongdongnan basin. Sediment-starved margins occur in the middle and eastern basin because of a very wide shelf and deficient sediment supply