--> Morphology, Seismic Characteristics and Origin of Widespread Sediment Waves in a Submarine Canyon System on the Northern South China Sea Margin
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Morphology, Seismic Characteristics and Origin of Widespread Sediment Previous HitWavesNext Hit in a Submarine Canyon System on the Northern South China Sea Margin

Fuliang Lyu1, Wei Li2, Jian Li2, Li Li1, Jingwu Wu1


1Petrochina Hangzhou Research Institute of Geology;
2Institute of Oceanology, Chinese Academy of Sciences


May 19-22 2019 – 2019 AAPG Annual Convention and Exhibition, San Antonio, Texas

Posted: June 30, 2019

Abstract

High-resolution multibeam bathymetric and 2D seismic data are used to investigate the morphology, internal architecture and origin of widespread sediment Previous HitwavesNext Hit in the eastern area of a submarine canyon system on the northern South China Sea margin. These sediment Previous HitwavesNext Hit exhibit quite similar seafloor morphologies and their crests are parallel or sub-parallel to the bathymetric contours. The seismic characteristics of these sediment Previous HitwavesNext Hit show several differences. Three types of sediment Previous HitwavesNext Hit (Type A, B and C) can be classified on the basis of their locations and internal characters. Type A and B sediment Previous HitwavesNext Hit are mainly discovered in the canyon ridges and the sediment Previous HitwavesNext Hit of Type C are located in the canyon Previous HitheadNext Hit areas. The seismic reflections within Type A and C sediment Previous HitwavesNext Hit are continuous and they all have an upslope migrating trend, while the individual sediment Previous HitwavesNext Hit of Type B are separated by listric faults. A key result of our analysis is the origin and implications of the three different types of sediment Previous HitwavesNext Hit. The Type A sediment Previous HitwavesNext Hit are inferred to be formed by turbidity currents flowing through the submarine canyons and overflowing the canyon flanks. Gravity-driven submarine creeping may result in the formation of Type B sediment Previous HitwavesNext Hit. The Type C sediment Previous HitwavesNext Hit are suggested to be generated by internal Previous HitwavesNext Hit interacting with the continental slope. The internal Previous HitwavesNext Hit might be sourced from the Luzon Strait as reported in previous oceanographic studies. Our results may enable the better understanding of the origin of widespread sediment Previous HitwavesTop on other submarine canyon systems. It would be also of great significance for a correct risk assessment, as our study area now is one of the most active regions for hydrocarbon explorations.

AAPG Datapages/Search and Discovery Article #90350 © 2019 AAPG Annual Convention and Exhibition, San Antonio, Texas, May 19-22, 2019