Identifying and quantifying erosion beneath the deposits of long-runout turbidity currents along their pathway

摘要: Variations between the geochemical compositions, coccolith species compositions and physical properties of turbidite muds their underlying hemipelagites can be used to understand erosive nature sediment gravity flows. Large-volume submarine landslides on NW Moroccan continental margin produce long-runout turbidity currents capable traversing hundreds-to-thousands kilometres across adjacent Turbidite System (MTS). These are responsible for turbidites that among largest-volume, most aerially extensive, longest-runout deposits recorded. resulting beds correlated over distances > 1800 km full 250,000 km2 area MTS. Due ability trace these individual flow throughout MTS large-volume A5, A7, A11, A12 A15 shown upon debouching Agadir Canyon, whilst smaller-volume flows were not erosive. aforementioned have been eroding up 15 km3 material in Canyon mouth, equating as much 50% later deposit volume. Evidence suggests erode 4.5 m within scours mouth Canyon. However, 8.0 deep, indicating several contribute forming a series cut fill episodes. Several flows, including A11 also Basin 210 from canyon. The present study indicates A7 channel-lobe transition zone proximal Madeira Abyssal Plain after exiting Channels, 800 Studying compositional changes along entire pathway has provided invaluable information whether erosive, where this erosion takes place, what extent they seafloor. There broader implications towards gaining about processes at bed interface, calculating basin budgets better understanding discontinuous stratigraphy distal systems.