Calibration between Eustatic Estimates from Backstripping and Oxygen Isotopic Records for the Oligocene ...

• Main Authors: Pekar, Stephen F., Christie-Blick, Nicholas, Kominz, Michelle A., Miller, Kenneth G.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Columbia University 2002
• Subjects: Geology; FOS: Earth and related environmental sciences; Submarine geology; Chemical oceanography; Pacific; Southern Ocean; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.7916/d85t3wmt; https://academiccommons.columbia.edu/doi/10.7916/D85T3WMT

Eustatic estimates from the backstripping of Oligocene sections are compared quantitatively with δ18O data. Each of the nine Oligocene δ18O 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 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 δ18O 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 10 m of ASL change (r2 = 0.807 and 0.960, respectively), and with records from ODP Site 689 (Southern Ocean; 0.13‰ per 10 m of ASL change; r2 = 0.704). This correlation suggests that Southern Ocean deep-water temperature changes were smaller than ...