The depositional characteristics of turbidity current in Manila Trench: sediment provenance, geochemical elements and organic carbon burial

Ren，Xixi1; Xu，Jingping2,3; Wang，Houjie1,2; Liu，Meng3; Liu，Xiting1,2; Li，Yan4; Wu，Xiao1,2

2024-04-01

10.1016/j.jseaes.2024.106074

Journal of Asian Earth Sciences   影响因子和分区

1367-9120

Turbidity currents play a significant role in sediment transport in deep ocean, profoundly impacting sedimentation in the abyssal sea. This study focused on a 375 cm long sediment core collected from the Manila Trench, revealing a distinctive 15 cm turbidite layer characterized by coarse sediment, an upward fining pattern, and a basal erosion surface. Analysis of rare earth elements and Nd isotope indicates that this turbidite layer originated from Taiwan Island. Initiated in the estuarine shelf region of southwestern Taiwan Island, the turbidity current transported substantial biogenic debris and marine fresh organic carbon into the Manila Trench. Consequently, the turbidite layer exhibited an elevated CaO content and more positive δC values. Despite lower TOC content in the turbidite layer due to coarse particle size, the mixture of marine fresh organic matter significantly lowered the carbon age of this layer compared to the strata both below and above it. The rapid sedimentation of the turbidite deposit led to an organic carbon burial flux comparable to the rate at which normal deep-sea sediment buries organic carbon over seven hundred years. Notably, finer sediment overlaying the turbidite layer acted as a cap, enhancing carbon sequestration within the trench. In contrast to nearby core GEO6, which documented over 11 turbidity currents, core S02 recorded only one event. Detailed bathymetric analysis highlights the crucial role of local topography in detecting and preserving turbidity currents. The insights gained from this study would advance our understanding of how turbidity currents shape and influence the deep ocean sedimentation.

Carbon burial Depositional characteristics Manila Trench Sediment provenance Turbidity current

SCI

英语

其他

GEOSCIENCES

2-s2.0-85186091875

Scopus

1.College of Marine Geosciences,Key Laboratory of Submarine Geosciences and Prospecting Technology,Frontiers Science Center for Deep Ocean Multispheres and Earth System,Ocean University of China,Qingdao,238 Songling Road,266100,China
2.Laboratory for Marine Geology,Laoshan Laboratory,Qingdao,266061,China
3.Department of Ocean Science & Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Key Laboratory of Polar Geology and Marine Mineral Resources,China University of Geosciences (Beijing),Beijing,100083,China

Ren，Xixi,Xu，Jingping,Wang，Houjie,et al. The depositional characteristics of turbidity current in Manila Trench: sediment provenance, geochemical elements and organic carbon burial[J]. Journal of Asian Earth Sciences,2024,264.

Ren，Xixi.,Xu，Jingping.,Wang，Houjie.,Liu，Meng.,Liu，Xiting.,...&Wu，Xiao.(2024).The depositional characteristics of turbidity current in Manila Trench: sediment provenance, geochemical elements and organic carbon burial.Journal of Asian Earth Sciences,264.

Ren，Xixi,et al."The depositional characteristics of turbidity current in Manila Trench: sediment provenance, geochemical elements and organic carbon burial".Journal of Asian Earth Sciences 264(2024).