Glacioeustatic changes in the early and middle Eocene (51–42 Ma): Shallow-water stratigraphy from ODP Leg 189 Site 1171 (South Tasman Rise) and deep-sea δ18O records

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Research Article| July 01, 2005 Glacioeustatic changes in the early and middle Eocene (51–42 Ma): Shallow-water stratigraphy from ODP Leg 189 Site 1171 (South Tasman Rise) and deep-sea δ18O records Stephen F. Pekar; Stephen F. Pekar 1Queens College, School of Earth and Environmental Sciences, 65-30 Kissena Boulevard, Flushing, New York 11367, USA, and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Audrey Hucks; Audrey Hucks 2The Pennsylvania State University, Department of Geoscience, 303 Deike Building, University Park, Pennsylvania 16802-2712, USA Search for other works by this author on: GSW Google Scholar Michael Fuller; Michael Fuller 3University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, 1618 East-West Road, POST Building, Honolulu, Hawaii 96822, USA Search for other works by this author on: GSW Google Scholar Shawna Li Shawna Li 4Columbia University, Department of Earth and Environmental Engineering, New York, New York 10027, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen F. Pekar 1Queens College, School of Earth and Environmental Sciences, 65-30 Kissena Boulevard, Flushing, New York 11367, USA, and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA Audrey Hucks 2The Pennsylvania State University, Department of Geoscience, 303 Deike Building, University Park, Pennsylvania 16802-2712, USA Michael Fuller 3University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, 1618 East-West Road, POST Building, Honolulu, Hawaii 96822, USA Shawna Li 4Columbia University, Department of Earth and Environmental Engineering, New York, New York 10027, USA Publisher: Geological Society of America Received: 11 Sep 2003 Revision Received: 18 Jul 2004 Accepted: 24 Jul 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2005) 117 (7-8): 1081–1093. https://doi.org/10.1130/B25486.1 Article history Received: 11 Sep 2003 Revision Received: 18 Jul 2004 Accepted: 24 Jul 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Stephen F. Pekar, Audrey Hucks, Michael Fuller, Shawna Li; Glacioeustatic changes in the early and middle Eocene (51–42 Ma): Shallow-water stratigraphy from ODP Leg 189 Site 1171 (South Tasman Rise) and deep-sea δ18O records. GSA Bulletin 2005;; 117 (7-8): 1081–1093. doi: https://doi.org/10.1130/B25486.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Sequence boundary ages determined in shallow-water sediments obtained from ODP (Ocean Drilling Program) Leg 189 Site 1171 (South Tasman Rise) compare well with other stratigraphic records (New Jersey, United States, and northwestern Europe) and δ18O increases from deep-sea records, indicating that significant (>10 m) eustatic changes occurred during the early to middle Eocene (51–42 Ma). Sequence boundaries were identified and dated using lithology, bio- and magnetostratigraphy, water-depth changes, CaCO3 content, and physical properties (e.g., photospectrometry). They are characterized by a sharp bioturbated surface, low CaCO3 content, and an abrupt increase in glauconite above the surface. Foraminiferal biofacies and planktonic/benthic foraminiferal ratios were used to estimate water-depth changes. Ages of six sequence boundaries (50.9, 49.2, 48.5–47.8, 47.1, 44.5, and 42.6 Ma) from Site 1171 correlate well to the timings of δ18O increases and sequence boundaries identified from other Eocene studies. The synchronous nature of sequence boundary development from globally distal sites and δ18O increases indicates a global control and that glacioeustasy was operating in this supposedly ice-free world. This is supported by previous modeling studies and atmospheric ρCO2 estimates showing that the first time ρCO2 levels decreased below a threshold that would support the development of an Antarctic ice sheet occurred at ca. 51 Ma. Estimates of sea-level amplitudes range from ∼20 m for the early Eocene (51–49 Ma) and ∼25 m to ∼45 m for the middle Eocene (48–42 Ma) using constraints established for Oligocene δ18O records. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.