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The Late Eocene Earth—Hothouse, Icehouse, and Impacts

GSA Special Papers

The Late Eocene Earth—Hothouse, Icehouse, and Impacts

Author(s)

Geological Society of America

Volume

452

DOI:

https://doi.org/10.1130/SPE452

Copyright:

© 2009 Geological Society of America

ISBN print:

9780813724522

Publication date:

April 01, 2009

Book Chapter

Climate threshold at the Eocene-Oligocene transition: Antarctic ice sheet influence on ocean circulation

Author(s)

Kenneth G Miller

Kenneth G Miller

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA

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James D Wright

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA

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Miriam E Katz

Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA

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Bridget S Wade

Department of Geology & Geophysics, Texas A&M University, College Station, Texas 77840, USA

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James V Browning

James V Browning

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA

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Benjamin S Cramer

Benjamin S Cramer

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA

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Yair Rosenthal

Institute of Marine & Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA

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Doi:

https://doi.org/10.1130/2009.2452(11)

Published:

April 01, 2009

We present an overview of the Eocene-Oligocene transition from a marine perspective and posit that growth of a continent-scale Antarctic ice sheet (25 × 10⁶ km³) was a primary cause of a dramatic reorganization of ocean circulation and chemistry. The Eocene-Oligocene transition (EOT) was the culmination of long-term (10⁷ yr drawdown and related cooling that triggered a 0.5‰–0.9‰ transient pre-scale) CO₂ cursor benthic foraminiferal δ¹⁸O increase at 33.80 Ma (EOT-1), a 0.8‰ δ¹⁸O increase at 33.63 Ma (EOT-2), and a 1.0‰ δ¹⁸O increase at 33.55 Ma (oxygen isotope event...

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