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• W2091095009 endingPage "350" @default.
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• W2091095009 abstract "The average major-element compositions of clastic sedimentary rock assemblages (i.e. carbonates, evaporites and iron formations not considered) for various times in earth history (Archean, Early Proterozoic, Late Proterozoic, Phanerozoic) are reported, based largely on the compilations of F.L. Schwab. Uncertainties in the averages are considerable. There is little evidence of secular change in the average composition of sedimentary rocks during post-Archean times. Such data do not support the idea of a gradual change in composition of the upper continental crust from mafic to felsic composition. Trace-element patterns in sedimentary rocks, particularly REE and Th distributions, support the idea of constancy of upper-crustal composition during the post-Archean. The average composition of Archean clastic sedimentary rocks differs significantly from the post-Archean average, being enriched in Na, Mg and Ca, and depleted in Si and K. Such differences are consistent with the Archean upper crust having a more mafic composition than post-Archean upper crust. The trace-element data further support this idea. It is noted that the average composition of post-Archean clastic sedimentary rocks predicts, to within a factor of < 1.2, the composition of the exposed continental crust for the elements Si, Al, Fe, K, Mg and Ti. The abundances of Ca and Na are depleted in the sedimentary rocks due to the fact that the compositions of carbonates, evaporites and seawater were not considered. The average composition of Archean clastic sedimentary rocks does not compare favourably with an independent estimate of Archean upper-crust composition, being enriched in Si, K, and depleted in Ca, Fe, Mg and Ti. Such a comparison indicates that the Archean upper crust may have had a more felsic major-element composition than previously thought." @default.
• W2091095009 created "2016-06-24" @default.
• W2091095009 creator A5071879899 @default.
• W2091095009 date "1982-11-01" @default.
• W2091095009 modified "2023-10-03" @default.
• W2091095009 title "On the geochemical evolution of sedimentary rocks" @default.
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• W2091095009 doi "https://doi.org/10.1016/0009-2541(82)90087-0" @default.
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