Turbidite deposition in Manila Trench since 1.4 ka B.P. and its controlling factors 马尼拉海沟１-４ｋａＢ．Ｐ．以来浊流事件沉积及其成因机制

Xu，Wei1; Liu，Xiao Hang1; Liu，Meng2; Hu，Li Sha1; Xu，Jing Ping2; Wang，Zhi Wen1

2022-06-01

10.7605/gdlxb.2022.03.035

古地理学报   影响因子和分区

1671-1505

Turbidity current is an important way for long-distance sediment transport. Submarine turbidity current widely develops in submarine canyons or trenches. The Manila Trench is located at the western Pacific marginal subduction zone and with abundant tectonic activities (earthquake) and extreme climatic events (e. g., Typhoon), which easily generate turbidity. Because of the complicated abyss topography of the Manila Trench, turbidity currents are rarely reported. In this study, we choose a core collected from 3747 m depth water in northern Manila irench during 2018 South China Sea Cruise by JNSrC for turbidite analyses. The maximum depositional age is 1405 a B. P. High-precision particle size analysis (25 mm per analysis) and sedimentary characteristics show that GE06 core records at least eleven turbidity flow deposits (T l - T l l). Most turbidity deposits show a gradually finning upward grain size, and an erosional surface in the bottom of each turbidite. Only T8 shows an inversely graded sequence, which may be the hyperpycnal flow deposit. Combined with the regional geological data, we found that frequent typhoons in the study area have brought a large amount of terrestrial loose sediments to the upper reaches of the Manila Trench (Gaoping Canyon) since 1.4kaB.P. These loose deposits collapsed and were transported downstream due to frequent earthquakes, forming recurring turbidity deposits in the Manila Trench.

earthquake Manila Trench South China Sea turbidity sediment

中文

其他

2-s2.0-85134482131

Scopus

1.College of Marine Geosciences,Ocean University of China,Shandong,Qingdao,266100,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Xu，Wei,Liu，Xiao Hang,Liu，Meng,等. Turbidite deposition in Manila Trench since 1.4 ka B.P. and its controlling factors 马尼拉海沟１-４ｋａＢ．Ｐ．以来浊流事件沉积及其成因机制[J]. 古地理学报,2022,24(3):449-460.

Xu，Wei,Liu，Xiao Hang,Liu，Meng,Hu，Li Sha,Xu，Jing Ping,&Wang，Zhi Wen.(2022).Turbidite deposition in Manila Trench since 1.4 ka B.P. and its controlling factors 马尼拉海沟１-４ｋａＢ．Ｐ．以来浊流事件沉积及其成因机制.古地理学报,24(3),449-460.

Xu，Wei,et al."Turbidite deposition in Manila Trench since 1.4 ka B.P. and its controlling factors 马尼拉海沟１-４ｋａＢ．Ｐ．以来浊流事件沉积及其成因机制".古地理学报 24.3(2022):449-460.