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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Geosynclines: What Contribution to the Crust?
Frederic L. Schwab
ABSTRACT
Estimates of the chemical composition of geosynclinal assemblages are made by converting detailed petrographic mineral analyses of individual samples into published chemical equivalents. While marginal geosynclinal basins, of which the Jackson, Wyoming, section is representative, do not appreciably differ from the composition of miogeosynclines, they exhibit very detailed changes vertically in composition and lithological proportion. Miogeosynclinal sediments differ greatly from the average sediment, and represent concentrations of CaO, MgO, CO2, and H2O. Considerable amounts of silica and alumina reflect the importance of intrageosynclinal terrigenous sources Eugeosyneclinal sediments, at first approximation, approach the average composition of igneous rocks, th ugh silica is slightly enriched.
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