Carbon-oxygen isotopic composition of Flagstaff carbonate rocks and its bearing on the history of Paleocene-Eocene Lake Flagstaff of central Utah

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The carbon and oxygen isotopic composition of freshwater dolomitic and calcitic carbonate rocks and of calcitic molluscs from the Flagstaff formation (Paleocene-Eocene) of central Utah is consistent with the three-phase depositional history proposed by (1949) on the basis of stratigraphic relations and lithology. The isotopic data are also consistent with the hypothesis that the middle Flagstaff unit derived its "evaporitic" nature from the influx of soluble material from Jurassic salt beds. Penecontemporaneous, or very early diagenetic dolomitization of the fine-grained calcitic ooze with probable oxygen isotopic equilibration between calcite and dolomite is indicated. Carbon isotope ratios suggest increasing influx of stream-borne sediments in the last stage of Lake Flagstaff.

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