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Cyclostratigraphic Trends Of Δ13c In Upper Cambrian Strata, Great Basin, Usa: Implications For Astronomical Forcing, Wesley Donald Weichert
Cyclostratigraphic Trends Of Δ13c In Upper Cambrian Strata, Great Basin, Usa: Implications For Astronomical Forcing, Wesley Donald Weichert
MSU Graduate Theses
Composite geochemical studies of carbonate isotope values (δ13C) by other investigators have established that the Cambrian period is punctuated by a series of significant, globally correlated, positive and negative δ13C excursions. However, it remains unclear if low-amplitude secular variations in δ13C values exist superimposed on, or between large-scale perturbations in the Cambrian carbon cycle, especially in cyclic successions. Rocks of Steptoean-Sunwaptan (Paibian-Jiangshanian) stage, exposed in the Great Basin of Utah and Nevada, are excellent candidates for testing the hypothesis that sedimentary cycles record minor variations in Earth's orbit (Milankovitch cycles) through application of high-resolution chemostratigraphic analysis. High-resolution δ13C data was …