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.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.