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- W1978753726 abstract "A turbidity current that contains fresher or otherwise less dense water than its surroundings may initially be denser than the ambient and propagate as a bottom-hugging flow, but later reverse in buoyancy as its bulk density decreases through sedimentation to become lower than that of the ambient seawater. It is proposed that this reversal in buoyancy may be a significant mechanism controlling the structure and facies of turbiditic deposits. Buoyancy reversal followed by lofting may directly affect the relative distribution of fine and coarse material in the deposit, while buoyancy reversal itself may mediate the transformation between dilute and highly-concentrated suspension flows, particularly in distal regions, and thus lead to the formation of complex turbiditic beds: in particular, the generation of distal co-genetic debrites may be expected. Similar transformations occur within dilute pyroclastic density currents, where a mobile, basal concentrated flow, termed a surge-derived pyroclastic flow, develops through rapid sedimentation from the suspended load of the overlying surge. The physical mechanisms involved in these processes are discussed, leading to the proposal of some associated facies models; these are compared with field data from the Northern Apennines, with some striking similarities being noted as well as some differences. On the basis of this discussion, some directions are suggested for future experimental and modelling work on the topic." @default.
- W1978753726 created "2016-06-24" @default.
- W1978753726 creator A5027904724 @default.
- W1978753726 creator A5055547765 @default.
- W1978753726 date "2009-12-01" @default.
- W1978753726 modified "2023-09-27" @default.
- W1978753726 title "Reversing buoyancy in turbidity currents: developing a hypothesis for flow transformation and for deposit facies and architecture" @default.
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- W1978753726 doi "https://doi.org/10.1016/j.marpetgeo.2009.02.010" @default.
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