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Major-element-oxides from five sections of the Phosphoria Formation Mud Spring, Lakeridge, Wheat Creek, Fontenelle Creek, and Conant Creek are partitioned into normative-mineral components in order to determine the marine versus terrigenous fractions of the rocks. The components are apatite, dolomite, calcite, biogenic silica and organic matter, the marine-derived fraction of the samples, and a detrital component, the terrigenous fraction of the samples. The same proportionality constants are used in the calculation of each component for all the sections. The average sum of the components is 99.6 percent with an average standard deviation of 2.7 percent, demonstrating that the components have a relatively constant composition. The coherence of the normative scheme was also checked by comparing measured inorganic CO2 to calculated CO2J correlation coefficients were 0.99 or greater for all but one of the sections. Assuming aluminum is entirely of terrigenous origin, X-Y plots of aluminum versus Ba, Li, Ga, and Sc, which show good correlations, demonstrate a relatively constant minor element content in the terrigenous fraction. The terrigenous fraction of the minor elements is determined primarily from a sample composed almost entirely of the terrigenous detrital component. There were exceptions where the terrigenous minorelement fraction was determined by the minor element content of a standard shale or by the minor-element/Al2O3 ratios extracted from a well defined minimum line formed on minor-element/Al2O3 graphs. The marine fraction of minor elements is the difference between bulk minor-element content of the samples and their terrigenous contribution of minor elements. Positive correlations exist between the marine fraction of several minor elements and the components apatite and organic matter, further validating the normative

u.s. geological survey open file report/open-file report

Partitioning of minor elements and major-element oxides between rock components and calculation of the marine derived fraction of the minor elements in rocks of the Phosphoria Formation, Idaho and Wyoming