Syracuse University SURFACE Dissertations - ALL SURFACE June 2014 STRATIGRAPHIC FRAMEWORK AND QUATERNARY PALEOLIMNOLOGY OF THE LAKE TURKANA RIFT, KENYA Amy Morrissey Syracuse University Follow this and additional works at: https://surface.syr.edu/etd Part of the Physical Sciences and Mathematics Commons Recommended Citation Morrissey, Amy, "STRATIGRAPHIC FRAMEWORK AND QUATERNARY PALEOLIMNOLOGY OF THE LAKE TURKANA RIFT, KENYA" (2014). Dissertations - ALL. 62. https://surface.syr.edu/etd/62 This Dissertation is brought to you for free and open access by the SURFACE at SURFACE. It has been accepted for inclusion in Dissertations - ALL by an authorized administrator of SURFACE. For more information, please contact
[email protected]. Dissertation abstract Lake sediments are some of the best archives of continental climate change, particularly in the tropics. This study is focused on three ~10m sediment cores and high- resolution seismic reflection data from Lake Turkana in northern Kenya. Lake Turkana is the world’s largest desert lake and the largest lake in the Eastern Branch of the East African Rift System. It is situated at ~2 °N at 360 m elevation and is ~250 km long and ~30 km wide with a mean depth of 35 m. The lake surface receives less than 200 mm yr-1 of rainfall during the twice-annual passing of the Intertropical Convergence Zone via Indian Ocean- derived moisture, and evaporation is >2300 mm yr-1. This study is the first to quantify the climate and deepwater limnologic changes that have occurred in the area during the African Humid Period (AHP) and since the Last Glacial Maximum. A 20-kyr, multiproxy lake level history was derived from ~1100 km of CHIRP seismic reflection data, in conjunction with gamma ray bulk density, magnetic susceptibility, total organic carbon, total inorganic carbon, core lithology, and scanning XRF data from sediment cores that were chronologically constrained by radiocarbon dates.