Mass transport deposits and processes in the north slope of the Xisha Trough, northern South China Sea

QIN Zhiliang; WU Shiguo; WANG Dawei; LI Wei; GONG Shaojun; MI Lijun; SPENCE George

doi:10.1007/s13131-015-0608-9

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(9): 117-125

QIN Zhiliang, WU Shiguo, WANG Dawei, LI Wei, GONG Shaojun, MI Lijun, SPENCE George. Mass transport deposits and processes in the north slope of the Xisha Trough, northern South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(9): 117-125. doi: 10.1007/s13131-015-0608-9

Citation:

QIN Zhiliang, WU Shiguo, WANG Dawei, LI Wei, GONG Shaojun, MI Lijun, SPENCE George. Mass transport deposits and processes in the north slope of the Xisha Trough, northern South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(9): 117-125. doi: 10.1007/s13131-015-0608-9

Citation:

QIN Zhiliang, WU Shiguo, WANG Dawei, LI Wei, GONG Shaojun, MI Lijun, SPENCE George. Mass transport deposits and processes in the north slope of the Xisha Trough, northern South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(9): 117-125. doi: 10.1007/s13131-015-0608-9

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Mass transport deposits and processes in the north slope of the Xisha Trough, northern South China Sea

doi: 10.1007/s13131-015-0608-9

1.
Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456, China
2.
Laboratory of Marine Geophysics and Deep Sea Georesource, Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
3.
Tianjin Exploration Center of Marine Geology, Tianjin 300170, China
4.
Department of Exploration, China National Offshore Oil Corporation, Beijing 100010, China
5.
School Earth & Ocean Sciences, University of Victoria, Victoria, V8p 5c2, Canada

Received Date: 2014-09-23
Rev Recd Date: 2014-12-16

Abstract

Abstract

Triple mass-transport deposits (MTDs) with areas of 625, 494 and 902 km², respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic reflection data and multi-beam bathymetric data, the Quaternary MTDs are characterized by typical geometric shapes and internal structures. Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°. The head wall scarps of the MTDs arrived to 50 km in length (from headwall to termination). Their inner structures include well developed basal shear surface, growth faults, stepping lateral scarps, erosion grooves, and frontal thrust deformation. From seismic images, the central deepwater channel system of the Xisha Trough has been filled by interbedded channel-levee deposits and thick MTDs. Therefore, we inferred that the MTDs in the deepwater channel system could be dominated by far-travelled slope failure deposits even though there are local collapses of the trough walls. And then, we drew the two-dimensional process model and threedimensional structure model diagram of the MTDs. Combined with the regional geological setting and previous studies, we discussed the trigger mechanisms of the triple MTDs.
- South China Sea,
- mass transport deposits,
- submarine slides,
- gravity flow,
- deepwater channel system

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References(46)

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