Weathering and the Production of Sediment. Surface Portion of the Geological Cycle. Types of Sedimentary Material. Terrigenous Clastics (TC) Detrital Particles Derived from pre-existing rocks Derived external to the depositional basin .
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Surface Portion of the
Derived from pre-existing rocks
Derived external to the depositional basin
Transported by surface processes to the site of deposition
Particulate Residues: quartz, feldspar, rock fragments, etc (unaltered rock forming mineral/rock grains)
Secondary Minerals: minerals new-formed in the surface weathering environment: clay minerals, oxides, amorphous silica, etcTypes of Sedimentary Material
Laminated Castile Formation basinal evaporites. Dark laminae are calcite plus organic matter; light laminae are gypsum (Peter Scholle)
(> 2 mm)
textural term mineralogical term
When plotted, grain size increases from right to left, fines to right, coarse to left
Resistant Less resistant
Chert clasts Most other minerals
Zircon Lithic clasts