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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 49 (1965)

Issue: 1. (January)

First Page: 81

Last Page: 87

Title: Chemical Composition of Shales of Mannville Group (Lower Cretaceous) of Central Alberta, Canada

Author(s): F. A. Campbell (2), G. D. Williams (3)


The X-ray fluorescence method was used to analyze 113 shales; seven from the Upper Devonian Calmar Formation, 98 from the Lower Cretaceous Mannville Group and 8 from the Lower Cretaceous Joli Fou Formation. The average composition of the shales studied is 64.83% SiO2, 2.66% MgO, 15.72% Al2O3, 2.50% K2O, 2.42% CaO, 5.08% Fe2O3, 97 ppm. Rb, and 210 ppm Sr. The Rb/Sr ratio of .46 is in good agreement with that suggested for shales by earlier workers. The Rb/K varies from about 0.004 for shales formed in a brackish environment, to 0.006 for normal marine shales.

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