Finnegan, Seth and Bergmann, Kristin and Eiler, John M. and Jones, David S. and Fike, David A. and Eisenman, Ian and Hughes, Nigel C. and Tripati, Aradhna K. and Fischer, Woodward W. (2011) The Magnitude and Duration of Late Ordovician–Early Silurian Glaciation. Science, 331 (6019). pp. 903-906. ISSN 0036-8075 http://resolver.caltech.edu/CaltechAUTHORS:20110222-093848058
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Understanding ancient climate changes is hampered by the inability to disentangle trends in ocean temperature from trends in continental ice volume. We used carbonate “clumped” isotope paleothermometry to constrain ocean temperatures, and thereby estimate ice volumes, through the Late Ordovician–Early Silurian glaciation. We find tropical ocean temperatures of 32° to 37°C except for short-lived cooling by ~5°C during the final Ordovician stage. Evidence for ice sheets spans much of the study interval, but the cooling pulse coincided with a glacial maximum during which ice volumes likely equaled or exceeded those of the last (Pleistocene) glacial maximum. This cooling also coincided with a large perturbation of the carbon cycle and the Late Ordovician mass extinction.
|Additional Information:||© 2011 American Association for the Advancement of Science. Received for publication 23 November 2010. Accepted for publication 19 January 2011. Published Online 27 January 2011. We thank T. Raub, M. Rohrssen, and B. Gaines for assistance with field and lab work; D. Boulet and Société des établissements de plein air du Québec (SEPAQ) Anticosti for permission to work in Anticosti National Park; and B. Hunda for supplying samples. This work was funded by an Agouron Institute award to W.W.F. and D.A.F. and NSF Division of Earth Sciences awards to W.W.F. and J.M.E.|
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|Deposited By:||Tony Diaz|
|Deposited On:||08 Mar 2011 23:45|
|Last Modified:||26 Dec 2012 12:57|
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