2000 Annual Science Report
Pennsylvania State University Reporting | JUL 1999 – JUN 2000
Task V: Neoproterozoic Variations in Carbon and Sulfur Cycling
Efforts have been made to reconstruct the detailed history of climate, atmospheric chemistry (pO2 and pCO2), ocean chemistry, and the global cycles of carbon and sulfur during the 800-500 Ma period through geochemical analyses of Neoproterozoic sequences in Namibia and Australia, and also through modeling. We have generated a continuous record of sulfur isotopic composition of marine sulfate for much of the late Neoproterozoic from Namibian strata, and have produced geochemical cycle models that successfully produce stable isotope variations observed in the records.
PROJECT MEMBERS:Michael Arthur
RELATED OBJECTIVES:Objective 12.0
Define climatological and geological effects upon the limits of habitable zones around the Sun and other stars to help define the frequency of habitable planets in the universe.
Determine the resilience of local and global ecosystems through their response to natural and human-induced disturbances.