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Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan

Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan
Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan
Submarine canyons are major conduits for delivery of sediments originating from the continental margin into the deep sea. Here we analyze the effects of changing sea levels and climate (e.g. sediment supply) on the frequency of turbidites over the last 26 kyr. Our study is based on high resolution age controls for turbidites in core MD178-10-3291 from a water depth of 2070 m on the flank of the Gaoping Canyon offshore in SW Taiwan. Unlike most other submarine canyons worldwide, the head of the Gaoping Canyon has remained connected to the river mouth during the recent flooding of the continental shelf. Our results reveal that turbidity currents are less frequent during periods of sea-level lowstand. In contrast, turbidity currents have been more frequent since ~ 12 kyr BP, during the final stage of rising sea level and sea-level highstands. This may be the result of increased terrestrial sediment delivery due to enhanced rainfall intensity. Moreover, comparing to other source-to-sink systems, the turbidite occurrence in the flank of Gaoping Canyon through the last glacial cycle might have been more strongly influenced by climatic changes due to short sediment storage/response time.
0025-3227
140-150
Yu, Shun-wen
ba2dc6dd-d07b-4508-97d0-ec27e4f06382
Tsai, Louis L.
185ee45a-cc65-4ba0-8142-82f5addf93b6
Talling, Peter J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Lin, Andrew T.
779b0a2c-607e-4bb5-8707-57f863beebe3
Mii, Horng-sheng
bd1810a1-9265-4780-b309-bc33626848a6
Chung, San-hsiung
b431c6d0-b692-43a2-9fd3-4608fee6e942
Horng, Chorng-shern
3d0d9429-844f-4f37-9a02-ccd2be8df121
Yu, Shun-wen
ba2dc6dd-d07b-4508-97d0-ec27e4f06382
Tsai, Louis L.
185ee45a-cc65-4ba0-8142-82f5addf93b6
Talling, Peter J.
1cbac5ec-a9f8-4868-94fe-6203f30b47cf
Lin, Andrew T.
779b0a2c-607e-4bb5-8707-57f863beebe3
Mii, Horng-sheng
bd1810a1-9265-4780-b309-bc33626848a6
Chung, San-hsiung
b431c6d0-b692-43a2-9fd3-4608fee6e942
Horng, Chorng-shern
3d0d9429-844f-4f37-9a02-ccd2be8df121

Yu, Shun-wen, Tsai, Louis L., Talling, Peter J., Lin, Andrew T., Mii, Horng-sheng, Chung, San-hsiung and Horng, Chorng-shern (2017) Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan. Marine Geology, 392, 140-150. (doi:10.1016/j.margeo.2017.08.011).

Record type: Article

Abstract

Submarine canyons are major conduits for delivery of sediments originating from the continental margin into the deep sea. Here we analyze the effects of changing sea levels and climate (e.g. sediment supply) on the frequency of turbidites over the last 26 kyr. Our study is based on high resolution age controls for turbidites in core MD178-10-3291 from a water depth of 2070 m on the flank of the Gaoping Canyon offshore in SW Taiwan. Unlike most other submarine canyons worldwide, the head of the Gaoping Canyon has remained connected to the river mouth during the recent flooding of the continental shelf. Our results reveal that turbidity currents are less frequent during periods of sea-level lowstand. In contrast, turbidity currents have been more frequent since ~ 12 kyr BP, during the final stage of rising sea level and sea-level highstands. This may be the result of increased terrestrial sediment delivery due to enhanced rainfall intensity. Moreover, comparing to other source-to-sink systems, the turbidite occurrence in the flank of Gaoping Canyon through the last glacial cycle might have been more strongly influenced by climatic changes due to short sediment storage/response time.

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More information

Accepted/In Press date: 9 August 2017
e-pub ahead of print date: 11 August 2017
Published date: 1 October 2017

Identifiers

Local EPrints ID: 414033
URI: http://eprints.soton.ac.uk/id/eprint/414033
ISSN: 0025-3227
PURE UUID: cabe8617-6ed0-49b7-871c-3ab154d83aca

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Date deposited: 13 Sep 2017 16:31
Last modified: 06 Oct 2020 18:13

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Contributors

Author: Shun-wen Yu
Author: Louis L. Tsai
Author: Peter J. Talling
Author: Andrew T. Lin
Author: Horng-sheng Mii
Author: San-hsiung Chung
Author: Chorng-shern Horng

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