The redox-sensitive geochemical behavior of uranium permits the use of Th/U ratios as a geochemical proxy for the oxidation state of the atmosphere and oceans during sedimentary processes. Due to the effects of post-depositional uranium mobility on Th/U ratios during events involving oxygenated fluids, direct measurements of Th/U ratios are often misleading, but the whole rock Pb isotope compos...

To evaluate the effect of reservoir flooding on carbon cycling over time, we studied sedimentary environments in three natural lakes that existed prior to impoundment and that have been incorporated in the larger lentic system of a 70-yr-old boreal reservoir in Quebec. Elemental and biomarker analyses were determined in all core intervals and three soil profiles to characterize source inputs of...

Manganese and iron reduction in marine sediments are known to play important roles in the biogeochemical cycles of many elements, including carbon, sulfur, phosphorus and several trace elements. These reduction reactions affect these cycles on a variety of time scales, ranging from those as short as seasonal time scales (e.g., nutrient cycling in coastal ecosystems), to those as long as thousan...

Abstract ––A large regional-scale Ordovician continental basin has been revealed for the first time in Siberia. Sedimentary structures rocks of Tyva represent deposition environments rivers, oxbow lakes, dunes, river deltas, tidal, and coastal plains. Ichnofossils record a succession from freshwater (limnic-fluvial) to deltaic tidal facies. Integrated studies sedimentary Central show that they ...

An integrated study of sediments was conducted to examine the facies architecture and depositional environment Cretaceous Pab Formation, Rakhi Gorge, Suleiman Ranges, Pakistan. This research focused on analyzing architectural elements facies, which are not commonly studied in sedimentary basins To identify lithofacies, outcrop analysis section measurement were performed. The identified lithofac...