Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Turbidite

  • Nicholas Arndt
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1622-3

Definition

A turbidite is a sediment deposited from a turbidity current, which is a current of sediment-charged water that moves under the force of gravity; it is therefore the product of a mass flow type of sediment movement.

Sediment grains in turbidity currents are eroded and suspended (and thus transported) by turbulence, in contrast to debris flows or grain flows, the other common types of mass flow processes. Importantly, the sediment plays the essential role in turbidity currents because they impose a density to the flow which drives it downslope; the water only acts as dilutant, passive lubricant, and provides turbulence. During flow, the turbidity current “tunnels” through the bottom of a standing water column; it slows down (and thus gradually diminishes in turbulence and drops – as a consequence – sediment) when the gradient of the slope decreases. Because turbidity currents accelerate near the shelf margin, can reach large dimensions, and flow steadily over inclined...

Keywords

Debris Flow Continental Margin Continental Slope Greenstone Belt Turbidity Current 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access.

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Maison des GéosciencesLGCA, Université J. FourierSt-Martin d’HèresFrance