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Features and Origin of Turbidity Current Sediment Waves in the Huatung Basin off the Eastern Taiwan Island

Acta Geologica Sinica(English Edition) 2019年第4期93卷 1088-1096页

作者： LIU Jie SUN Meijing GAO Hongfang LI Xuejie Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Key Laboratory of Marine Mineral Resources Ministry of Land and ResourcesGuangzhou Marine Geological SurveyGuangzhou 510075China

Based on numerous high-resolution seismic profiles,sediment waves and their distribution,morphological characteristics,internal structure,and potential origins were revealed in the eastern waters of *** sediment waves are located at the junction between the taitung canyon and other canyons in the *** wave length and the wave height of a single waveform ranged from 0.8 to 7.2 km and from 18 to 75 m,respectively(NE-SW direction).Sediment waves,located inside the bend of the taitung canyon,were characterized by an upward migration and showed mass transport deposits(MTDs)at the bottom,while the inner curve of the bend was subdivided into lower and upper wavy transition *** sediment waves on the outer curve of the bend were characterized by vertical accumulation,and there was no mass flow deposit at the *** to the geometry of the sediment waves,the calculated flow thicknesses across the entire wave field ranged from 196 to 356 m,and the current velocity ranged from 15 to 21 cm/*** morphological characteristics,the internal structure,and the distribution of sediment waves,as well as the numerical calculations,evidenced that these sediment waves had formed by turbidity *** development of the sediment wave field in eastern Taiwan was found to be similar to that in southwestern *** was the sedimentary response of the tectonic movement between 3 and^1 Ma which created the sedimentary systems where gravity flow processes *** current sediments settled in the place of less topographical constraints or overflowed in the bend section of the taitung canyon,which resulted in the formation of sediment wave fields.

关键词： Huatung Basin taitung canyon sediment wave turbidity current formation mechanism

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