Traction Carpet Geology

They have a convex up velocity profile and comprise a lower frictional and an upper collisional region.

Traction carpet geology.

Thus the grains and clasts interact with the substratum during transport. Freezing of this traction carpet yields an inversely graded layer. Traction is the geologic process whereby a current transports larger heavier rocks by rolling or sliding them along the bottom. And by overconcentration of a normal low density bedload.

Discussion and reply. They have a convex up velocity profile and comprise a lower frictional. The spaced stratification that characterizes some thick deep water sandstones consists of a stack of layers 5 10 cm thick that are inversely graded at their base and structureless at their top. Traction carpet stratification in turbidites.

These layers have been attributed to deposition from a succession of collapsed inertia layers traction carpets. Antidunes and traction carpet deposits in deep water channel sandstones cretaceous british columbia canada koji yagishita iwate university department of geology iwate japan. By contrast saltation a related sediment transport process moves grains across the bottom by bouncing or hopping. By rapid entrainment of gravel into suspension on rising stage followed by settling into the gravel traction carpet at peak and falling stage.

Abstract inverse grading in turbidites is conventionally ascribed to dispersive pressure caused by mutual collisions among grains within a traction carpet or grain flow. Traction carpets are highly concentrated bedload layers that are developed beneath and driven by turbulent overlying flows. Two mechanisms of traction carpet initiation are discussed. Deposition from the traction carpets occurs via progressive aggradation of the bed rather than via en masse freezing while the downward grain flux from the overlying flow maintains the.

The shearing traction carpet is supposed to become stratified with particle size increasing upward. Traction carpets are highly concentrated bedload layers that are developed beneath and driven by turbulent overlying flows.