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Geology; October 2002; v. 30; no. 10; p. 903-906; DOI: 10.1130/0091-7613(2002)030<0903:CBEEFB>2.0.CO;2
© 2002 Geological Society of America
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Calibration between eustatic estimates from backstripping and oxygen isotopic records for the Oligocene

Stephen F. Pekar1, Nicholas Christie-Blick2, Michelle A. Kominz3 and Kenneth G. Miller4

1 Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA
2 Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA
3 Department of Geosciences, Western Michigan University, Kalamazoo, Michigan 49008, USA
4 Department of Geological Sciences, Wright Labs, Rutgers University, Piscataway, New Jersey 08854, USA

Eustatic estimates from the backstripping of Oligocene sections are compared quantitatively with {delta}18O data. Each of the nine Oligocene {delta}18O events (maxima) identified in previous studies correlates with a stratigraphically determined sea-level lowstand. Oxygen isotopic records from planktonic foraminifers from western equatorial Atlantic Ocean Drilling Program (ODP) Site 929 indicate an isotopic increase of 0.16{per thousand} per 10 m decrease in the depth of the ocean (apparent sea level, ASL). Amplitudes of ASL change also correlate with moderate- and high-resolution benthic for a min i fer al {delta}18O records from ODP Sites 803 (western tropical Pacific) and 929 and from Deep Sea Drilling Project (DSDP) Site 522 (South Atlantic Ocean), with an isotopic change of 0.22{per thousand} per 10 m of ASL change (r2 = 0.807 and 0.960, respectively), and with records from ODP Site 689 (Southern Ocean; 0.13{per thousand} per 10 m of ASL change; r2 = 0.704). This correlation suggests that Southern Ocean deep-water temperature changes were smaller than tropical sea-surface temperature changes between million year–scale glacials and interglacials. It also suggests that the deep-sea Southern Ocean records may provide the best means to calibrate sea level to oxygen isotopes.

Key Words: eustasy • apparent sea level • oxygen isotopes • Oligocene • New Jersey • calibration




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