CYCLOSTRATIGRAPHY OF THE PARACHUTE CREEK MEMBER: ANALYSIS OF VERTICAL AND LATERAL FACIES AND INORGANIC GEOCHEMICAL VARIABILITY IN THE GREEN RIVER FORMATION OF THE UINTA BASIN, UTAH
The stratigraphic correlation produced in this study provides a template to place pXRF-based elemental concentration data in depositional and lithologic context. Elemental abundances were measured every 5 cm on the two cores studied in this project. They provide proxies for detrital input, clay minerology, carbonate type and abundance, redox conditions, and organic matter content. With each data point constrained by lithology, vertical and lateral trends of these proxies within high frequency lake expansion-contraction cycles can be examined, and longer-term trends within individual depositional environments can be studied.
The results of this study help to better understand the evolution of Lake Uinta and the potential driving mechanisms on various scales of lacustrine cyclicity. These contributions to a relatively well-studied lacustrine basin provide useful analogues for more poorly constrained basins.