clast


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clast

[klast]
(geology)
An individual grain, fragment, or constituent of detrital sediment or sedimentary rock produced by physical breakdown of a larger mass.
References in periodicals archive ?
Graded beds typically contain fine sand-sized clasts that pass upward into coarse and fine silt, and in some instances, to subordinate aluminous pelite.
and pebbly Sub-rounded to rounded extrabasinal clasts sandstone (quartzite and vein quartz, minor rock fragments).
The only occurrence of carbonate rocks is as fossiliferous clasts in breccias near the base of this formation.
CLAST will seek grants to develop libraries of classroom probeware kits, each focusing on a particular set of science learning goals, which participating teachers would be able to check out for extended use.
5-10 cm wide dike is composed of sandy material consisting of abundant clasts of sandstone, siltstone, and claystone, resembling the rocks of the Gauj a Formation.
Viewed under cathodoluminescence (CL) the clast types display different cements, Clast type 1 has a dull orange luminescence whilst clast type 2 is brightly luminescent.
To construct the stratigraphic sequence of Figure 3, the ratio and succession of different rock types and non-exposed intervals was recorded for each interval, emphasizing clast size, shape, and lithotype abundance.
The grain size and clast shape of the fluvial sediments depends on several factors, including source material, length of transportation or stream size and steepness (Sklar and Dietrich, 2006).
This paper attempts to reveal downstream changes of composition and texture of gravel clasts from the basin of known climate, physiography and geology, and to establish relationship between abundance of clast type in river and abundance of rock types in the source area (of mixed sedimentary, metamorphic and igneous rocks).