Dr. Page Quinton - SUNY Potsdam
Carbon isotopes in shallow epicontinental seas: lessons from the Late Ordovician
Carbon isotopic ratios recorded in marine carbonates are a useful tool for identifying ancient perturbations in the global carbon cycle and are widely used in chemostratigraphic and paleoclimatic studies. These applications work because the net burial/oxidation of organic carbon shifts the carbon isotopic composition of the surface ocean, and these changes can be preserved in marine carbonates. However, records from rocks deposited in epeiric seas present challenges for these types of applications. In particular, net primary productivity, terrestrial organic matter, freshwater input, meteoric diagenesis, and carbonate precipitation/weathering operating at local and regional scales can influence recorded carbon isotopic values in these shallow water settings. We will examine the Late Ordovician carbon isotopic record of eastern North America to discuss some of these effects and I will propose a sequence stratigraphic model for predicting when carbon isotopic records have been influenced by these local/regional process.
Dr. Page Quinton received her Ph.D. from the University of Missouri in 2016 and now is an Assistant Professor of Geology at SUNY Potsdam. Her research focuses on understanding and documenting climate change in the geologic past. By embracing a multidisciplinary approach using stable isotope geochemistry (oxygen and carbon), micropaleontology, and sedimentology she attempts to relate changes in global climate to perturbations in the global carbon cycle and major mass extinction events in deep time intervals (e.g. the Ordovician, Permian-Triassic boundary, and Cretaceous-Paleogene boundary).
David A.V. Eckhardt, U.S. Geological Survey (retired)
Tanzania, in East Africa, has an urgent need to develop sustainable supplies of potable drinking water. Much of the water for the capital region of Dar-es-Salaam is derived from reservoirs that suffer problems in water quality and distribution. A significant ground-water resource is available in an aquifer system that extends southward from the capital, beneath the coastal plain adjacent to the Indian Ocean. Initially, two exploratory test wells showed that the deep, confined unconsolidated aquifer deposits can provide good yields of potable water, but additional exploratory wells would be required before extensive development could proceed. International funding was provided to the Tanzanian government through the World Bank for drilling six more test wells for long-term aquifer monitoring, and for two supply wells. Oversight for the drilling project was provided by an independent consulting group, within which Dave was invited to participate.
This presentation describes the water-well drilling program, with its many technical and logistical difficulties, and some of the outcomes. Also, the presentation will give a cultural overview of Tanzania and its people, as well as a display of some of the natural resources and wildlife of East Africa.
-- B.S degree in Geological Sciences from Lehigh University,
-- M.S. degree in Forest Hydrology from West Virginia University, and
-- PhD degree in Environmental Science from Cornell University.
During his career with the U.S. Geological Survey, from 1974 through 2011, Dave focused on water-quality studies, mainly in the ground-water domain. He worked on regional water assessments in Pennsylvania, Long Island, and upstate New York, with special assignments to the Grand Canyon Environmental Sciences Group in Arizona, the National Park Service, and the U.S. Environmental Protection Agency. In 2012, after 37 years with the USGS, he retired from the Ithaca NY office and became a private consultant (very part-time), where he provides technical assistance to the USEPA Superfund Program. During 2013-14, Dave participated in a regional water-well drilling program in Tanzania, which is the focus of his presentation.
Speaker to be determined
Topic to be announced