Sedimentation on the Ross Sea continental shelf, Antarctica

摘要: Abstract Glacial marine sedimentation has prevailed throughout most of the early glacial history Ross Sea region; however, since late Miocene to Early Pliocene time West Antarctic Ice Sheet advanced onto continental shelf, perhaps several times. troughs western may also have formed at this time. These border outlet glaciers East Sheet. A widespread lodgement till facies was deposited during advance. Holocene (?) retreat expanded ice sheet left no conspicuous meltwater record, so decoupling from seafloor, rather than rapid melting, is implied. Modern sediment far less prevalent biogenic and reworked sediment, except in coastal areas adjacent small shelves tongues. Little or debris being transported beyond calving line Shelf. Siliceous mud ooze occurs where surface circulation vigorous warm deep waters up well. This siliceous along with terrigenous silt clay, blankets seafloor below approximately 300 m water depth; shelf deeper this. Surface sediments on shallow banks platforms clearly been by currents. The bottom current activity those geostrophic currents impinge shelf. Debris-flows turbidity are important eroding redistributing Terrigenous clay more abundant basal till. source problematic; plausible sources onshore transport suspended impinging subglacial input.