Turbidite

A sedimentary deposit formed when a sediment-laden density current flows underwater and settles. Many turbidites show graded bedding, with coarser grains below finer ones.

Turbidity current: A sediment-laden underwater flow driven by its density relative to surrounding water. It transports the sediment that settles to form a turbidite.
Sediment: Loose mineral, rock, or biological particles that can be transported and deposited. Turbidites consist of sediment carried and released by underwater flows.
Flysch: A thick succession of deep-water sedimentary rocks commonly deposited during mountain-belt development. Flysch successions often contain repeated turbidite beds.
Himalayan flysch: Deep-water sedimentary successions associated with the development of the Himalayan region. Its flysch strata include turbidites deposited during the growth of the mountain belt.
Graded bedding: A sedimentary structure in which grain size changes systematically through a bed. Many turbidites fine upward as the current loses its ability to carry coarse grains.
Stratification: The arrangement of sediment or rock into distinct layers. A turbidite is a bed within a larger stratified sequence.
Turbidite reservoir: A hydrocarbon reservoir in porous sandstone deposited by turbidity currents. Turbidite sand bodies can store hydrocarbons beneath sealing mudstones.
Nankai Trough: A subduction-zone trench off southwest Japan where sediments accumulate and deform. Its sedimentary record includes deposits from gravity-driven flows.
Bouma sequence: An idealized sequence of sedimentary structures in a complete turbidite bed. Its divisions describe structures produced as a turbidity current decelerates and deposits sediment.
Deep marine environment: The seafloor environment below the shallow, wave-influenced parts of the ocean. Many turbidites accumulate in deep-water basins and submarine channels.

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