Title page for ETD etd-04172012-223524


Type of Document Master's Thesis
Author Ferguson, Shannon
URN etd-04172012-223524
Title Evaluation of Pleistocene to Holocene (MIS 5 to 1) Climatic Changes in Southwestern Black Sea: A Palynological Study of DSDP Site 380
Degree Master of Science (M.S.)
Department Geology & Geophysics
Advisory Committee
Advisor Name Title
Warny, Sophie Committee Chair
Bart, Philip Committee Member
DeLong, Kristine Committee Member
Keywords
  • DSDP Site 380
  • brackish
  • sea level
  • Pyxidinopsis psilata
  • Galeacysta etrusca
  • Spiniferites cruciformis
  • salinity
  • Black Sea
  • dinoflagellates
Date of Defense 2012-03-23
Availability unrestricted
Abstract
Site 380 of the Deep Sea Drilling Program [DSDP] is located in the southwestern region of the Black Sea (4205.94, 2936.82E). The location of this site is important due to its proximity to the narrow Bosphorus strait, the only present-day connection between the Black Sea and the Aegean Sea. Drops in eustatic sea level during extensive Pleistocene glacial episodes disconnected the Black Sea from the Aegean Sea at the Bosphorus strait, creating a change from brackish to freshwater within the Black Sea during these intervals. Organic-walled phytoplankton (dinoflagellate cysts, acritarchs, and fresh-water algae) are investigated to better constrain these glacio-eustatic sea-level changes associated with extensive Pleistocene glacial episodes that resulted in interruption of water exchange between the Black Sea and the Aegean Sea. A combination of high-precision analysis of morphological changes seen in two of the most abundant dinoflagellate cyst species present, Galeacysta etrusca and Spiniferites cruciformis, is undertaken and is combined with dinoflagellate assemblage changes to evaluate a possible morphological response of the cysts to changes in sea-surface salinity and better quantify the impact of sea level changes on the history of the connection.
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