Weathering and erosion of rocks like granites concentrate elements that are necessary to form clay minerals, which accumulate as sediments. The deposition and burial of clays, in the delta of a river, for example, lead to the formation of the sedimentary rocks claystone and shale.
Topic: Earth Science
Subtopic: Minerals and Resources
Keywords: Geochemical cycles, Geology, Sedimentary rocks, Shale, Soils, Tonsteins