Paratethys-Southern Ocean teleconnection in the mid-Burdigalian; European climate on the verge to the Miocene Climate Optimum

Author(s): Grunert, Patrick; Tzanova, Alexandrina; Harzhauser, M.; Piller, W. E.
Author Affiliation(s): Primary:
University of Graz, Institute for Earth Sciences, Graz, Austria
Brown University, Department of Geological Sciences, Providence, RI, United States
Natural History Museum Vienna, Geological-Paleontological Department, Vienna, Austria
Volume Title: AGU 2013 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2013; American Geophysical Union 2013 fall meeting, San Francisco, CA, Dec. 9-13, 2013. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: The Early Ottnangian Cooling (EOC), a distinct cold-spell in European climate at ≈18 Ma preceding the Miocene Climate Optimum, is frequently reported in Paratethys records; however, the duration, magnitude, and underlying causes are poorly understood. A new paleoclimatic data-set provides unexpected insights into this event. UK'37-based sea surface temperatures > 25°C between 18.6 and 17.7 Myrs substantially exceed existing estimates, and indicate a significantly warmer European climate than previously assumed for this usually poorly recovered time interval. The EOC is expressed as an average drop of 2-3°C in Paratethyan water temperatures between ≈18.1 and 17.8 Myrs punctuated by two distinct cold snaps at ≈17.86 Ma and ≈17.81 Ma. The short duration of the EOC excludes Tethyan Seaway closure as its underlying cause. Instead, the revealed paleoclimatic pattern shows a strong correlation with isotope event Mi1b in deep-sea δ18O records (ODP Site 1090), and we propose a tight paleoclimatic coupling between the Southern Ocean and the Paratethys/Mediterranean realm as an alternative hypothesis. Eccentricity forcing most likely acted as pacemaker of this teleconnection, a mechanism recently emphasized in Early Miocene studies.
Year of Publication: 2013
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Burdigalian; Cenozoic; Cores; Leg 177; Lower Miocene; Marine sediments; Miocene; Neogene; ODP Site 1090; Ocean Drilling Program; Paleoclimatology; Sediments; South Atlantic; Southern Ocean; Tertiary
Coordinates: S425449 S425449 E0085359 E0085359
Record ID: 2015083286
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