Deep-sea sedimentation offshore eastern Taiwan: Facies and processes characterization

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题名:	Deep-sea sedimentation offshore eastern Taiwan: Facies and processes characterization
作者:	林殿順;Lehu, Rémi;Lallemand, Serge;Hsu, Shu-Kun;Babonneau, Nathalie;Ratzov, Gueorgui;Lin, Andrew T.;Dezileau, Laurent
贡献者:	地球科學學院地球科學學系
关键词:	Active margin;Earth Sciences;Earthquakes;Failure;Floods;Marine;Morphosedimentary mapping;Offshore;Sciences of the Universe;Sedimentation;Shaking;Slope instabilities;Slopes;Tectonics;Turbidites;Turbidity
日期:	2015-01-01
上传时间:	2026-04-23 11:31:52 (UTC+8)
出版者:	Elsevier;Elsevier B.V
摘要:	摘要： Recent sedimentary facies and processes along the offshore slope of east Taiwan are investigated using a large set of geophysical and sedimentological data. The Taiwan orogen is often considered as one of the most tectonically active regions in the world and also suffers important climatic activity with an average of four typhoons per year. We have mapped in details the morphosedimentary features and characterized the sedimentary facies along offshore eastern Taiwan. There, we show that the slope is driven by a variety of erosional processes from mass wasting to turbidity current. Mass movements such as slides or mass transport deposits (MTDs) are ubiquitous and affect the whole east coast off Taiwan. Detailed core investigations, such as grain size analysis, chemical and mineralogical composition, revealed that turbidite facies range from thin fine-grained turbidites to thick massive turbidite facies. The detailed analysis of turbidite beds allow us to discuss the controlling factors of turbidity current generation. Turbidity currents represent an important sedimentary process that governs the slope morphology off east Taiwan. Triggering mechanisms likely range from slope instabilities related to earthquakes shaking to failure relative to climatic-controlled pulses of sediment supply. We propose that at least two end-members are characteristics in our turbidite records in term of controlling factor:1)Turbidity currents likely generated by tectonic activity and earthquakes shaking in particular; and2)Turbidity currents likely generated by climatic activity such as typhoon-induced floods. •Using both geophysical (seismic, sea floor imagery) and sedimentological data (cores) we mapped morphosedimentaty features•Turbidity current is the main sedimentary process offshore eastern Taiwan.•Turbidity currents are likely triggered by seismic and climate activity.•Off east Taiwan offers good potential in investigating the record of extreme events. 出版者： Elsevier B.V 出版日期： 2015-11-01 出處： Marine Geology, 2015-11, Vol.369, p.1-18 版權： 2015 Elsevier B.V. 版權： CC0 1.0 - Universal 識別號： ISSN: 0025-3227 識別號： EISSN: 1872-6151 識別號： DOI: 10.1016/j.margeo.2015.05.013
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