1. Distinguishing Between Marine and Nonmarine Deposition on Early Earth: New Perspectives on Precambrian Source Rocks Gained from Modern Lakes
Timothy W. Lyons and William P. Gilhooly III, Department of Earth Sciences, University of California Riverside, Riverside CA 92521
Freshwater Lacustrine to Marine Transition: Our study of the Champlain Sea reveals chemical transitions associated with decreasing sulfur availability in sediments deposited in freshwater. We anticipate that metals chemistry will reflect the chemistry of the parent water mass and redox conditions during deposition. We are currently determining the major and trace metal concentrations of the sediment.
Carbon-Sulfur Relationships The salinity transect along the St. Lawrence Seaway tracks the increasing contribution of seawater sulfate (low C/S values). This spatial relationship is also found in the chemical-temporal shift in Lake Champlain.
St. Lawrence River
Estuary
We continue our efforts with analyses for the Great Salt Lake, Mahoney Lake and the Black Sea
Gulf of St. Lawrence
Lake Champlain data (above)
(Landward)
(Seaward)