DOI: 10.1016/j.tecto.2021.228813
论文题名: Deep-sea submarine erosion by the Kuroshio Current in the Manila accretionary prism, offshore Southern Taiwan
作者: Das P. ; Lin A.T.-S. ; Chen M.-P.P. ; Miramontes E. ; Liu C.-S. ; Huang N.-W. ; Kung J. ; Hsu S.-K. ; Pillutla R.K. ; Nayak K.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 807 语种: 英语
中文关键词: Bottom currents
; Kuroshio current
; Luzon strait
; Manila subduction zone
; Taiwan
英文关键词: Bathymetry
; Doppler effect
; Flow velocity
; Geophysical prospecting
; Gravel
; Hydrographic surveys
; Ocean currents
; Offshore oil well production
; Prisms
; Sea level
; Sediment transport
; Sedimentation
; Seismic response
; Seismic waves
; Submarines
; Underwater acoustic communication
; Wave propagation
; Accretionary prism
; Accretionary wedge
; Acoustic doppler current profiler
; Energy depositions
; Morphological evolution
; Multibeam bathymetry
; Reflection seismic
; Sedimentation rates
; Erosion
; accretionary prism
; Acoustic Doppler Current Profiler
; bathymetric survey
; bottom current
; plate motion
; plate tectonics
; seafloor spreading
; seismic data
; subduction zone
; submarine
; Kenting
; Kuroshio Current
; Luzon Strait
; Manila
; National Capital Region
; Pacific Ocean
; Philippines
; Taiwan
英文摘要: The Kenting Plateau is characterized by unusual low relief surfaces that straddle the topographic crest of the northern Manila accretionary prism off southern Taiwan at 400–700 m water depth. Multibeam bathymetric data, reflection seismic data, Acoustic Doppler Current Profiler (ADCP) data, surface grab samples, and sediment cores were collected in and around the Plateau to identify evidence of erosion in the Kenting Plateau and understand how the morphological evolution has been influenced by submarine erosion over geological time scales. The most distinctive feature on the Kenting Plateau is a 3 km × 7 km bean-shaped flat elevated platform (Kuroshio Knoll) revealed by multibeam bathymetry. Seismic data show almost no reflections beneath the seafloor and erosional truncations at the seafloor, especially in the Plateau's eastern half, evidencing widespread erosion. The P-wave velocity of the gravels recovered from the top of the Plateau ranges from 2.2 to 4 km/s. After comparing the velocity with the borehole data from nearby basin the burial depth of the parent rocks was found to be around 2 to 4 km below the seafloor, indicating that the parent rocks have been uplifted and gravels were formed due to erosion of the Plateau. The truncation of the seafloor shown on seismic sections suggests significant erosion on the Plateau. Sand content of the sediment cores decreases away from the Plateau, suggesting that sediment transport is effective in this area with high energy deposition, thereby accumulating coarse sediments on the Plateau and removing fine particles away from it. The presence of a dune field migrating northward of the Plateau, parallel to the Kuroshio Current also evidences active sediment transport in the area. Flow velocity of the Kuroshio Current observed from the ADCP data is very high, reaching up to 1.8 m/s on top of the Kuroshio Knoll (SE domain). We thus interpret that the observed intense erosion is caused by the Kuroshio Current, while the uplift of the Kenting Plateau is partially due to isostatic rebound caused by sediment removal through erosion and compression of the accretionary wedge. The higher sedimentation rate and coarser in grain size during sea level lowstand (20,000–12,000 yrs. BP) suggests that the erosion was more intense during the glacial period compared to that of deglacial period (< 12,000 yrs. BP) as seen from the MD97–2145 core. Submarine erosion is predominant throughout the Plateau, and it controls the geomorphology of the Plateau, especially the Kuroshio Knoll. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170793
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth Sciences, National Central University, Zhongli Dist., Taoyuan City, 32001, Taiwan; Institute of Oceanography, National Taiwan University, Taipei City, 10617, Taiwan; Faculty of Geosciences, University of Bremen, Bremen, 28359, Germany; MARUM – Center for Marine and Environmental Sciences, University of Bremen, Bremen, 28359, Germany; Ocean Center, National Taiwan University, Da'an District, Taipei City, 10617, Taiwan; Sinotech Engineering Consultants, Ltd., Sungshan Dist., Taipei City, 105052, Taiwan; Department of Earth Sciences, National Cheng-Kung University, Tainan City, 70101, Taiwan; Earth System Science Program, Taiwan International Graduate Program, Academia Sinica and National Central University, Taiwan
Recommended Citation:
Das P.,Lin A.T.-S.,Chen M.-P.P.,et al. Deep-sea submarine erosion by the Kuroshio Current in the Manila accretionary prism, offshore Southern Taiwan[J]. Tectonophysics,2021-01-01,807