Numerical ages of Cenozoic biostratigraphic datum levels: Results of South Atlantic Leg 73 drilling

Abstract

Research Article| July 01, 1984 Numerical ages of Cenozoic biostratigraphic datum levels: Results of South Atlantic Leg 73 drilling KENNETH J. HSÜ; KENNETH J. HSÜ 1Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar JOHN La BRECQUE; JOHN La BRECQUE 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar STEPHEN F. PERCIVAL; STEPHEN F. PERCIVAL 3Mobil Exploration and Production Services, Inc., Dallas, Texas 75221 Search for other works by this author on: GSW Google Scholar RAMIL C. WRIGHT; RAMIL C. WRIGHT 4Exxon Production Research Company, Houston, Texas 77001 Search for other works by this author on: GSW Google Scholar ANDREW M. GOMBOS; ANDREW M. GOMBOS 4Exxon Production Research Company, Houston, Texas 77001 Search for other works by this author on: GSW Google Scholar KENNETH PISCIOTTO; KENNETH PISCIOTTO 5Scripps Institution of Oceanography, La Jolla, California 92093 Search for other works by this author on: GSW Google Scholar PETER TUCKER; PETER TUCKER 6University of Edinburgh, Edinburgh, Scotland Search for other works by this author on: GSW Google Scholar NIKOLAI PETERSON; NIKOLAI PETERSON 7Munich University, Munich, Germany Search for other works by this author on: GSW Google Scholar JUDITH A. McKENZIE; JUDITH A. McKENZIE 8Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar HELMUT WEISSERT; HELMUT WEISSERT 8Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar ANNE MARIE KARPOFF; ANNE MARIE KARPOFF 9Geology Institute, Strasbourg, France Search for other works by this author on: GSW Google Scholar MAX F. CARMAN, Jr.; MAX F. CARMAN, Jr. 10University of Houston, Houston, Texas 77004 Search for other works by this author on: GSW Google Scholar EDWARD SCHREIBER EDWARD SCHREIBER 11City University of New York, Flushing, New York 10021 Search for other works by this author on: GSW Google Scholar Author and Article Information KENNETH J. HSÜ 1Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland JOHN La BRECQUE 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 STEPHEN F. PERCIVAL 3Mobil Exploration and Production Services, Inc., Dallas, Texas 75221 RAMIL C. WRIGHT 4Exxon Production Research Company, Houston, Texas 77001 ANDREW M. GOMBOS 4Exxon Production Research Company, Houston, Texas 77001 KENNETH PISCIOTTO 5Scripps Institution of Oceanography, La Jolla, California 92093 PETER TUCKER 6University of Edinburgh, Edinburgh, Scotland NIKOLAI PETERSON 7Munich University, Munich, Germany JUDITH A. McKENZIE 8Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland HELMUT WEISSERT 8Geological Institute, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland ANNE MARIE KARPOFF 9Geology Institute, Strasbourg, France MAX F. CARMAN, Jr. 10University of Houston, Houston, Texas 77004 EDWARD SCHREIBER 11City University of New York, Flushing, New York 10021 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1984) 95 (7): 863–876. https://doi.org/10.1130/0016-7606(1984)95<863:NAOCBD>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation KENNETH J. HSÜ, JOHN La BRECQUE, STEPHEN F. PERCIVAL, RAMIL C. WRIGHT, ANDREW M. GOMBOS, KENNETH PISCIOTTO, PETER TUCKER, NIKOLAI PETERSON, JUDITH A. McKENZIE, HELMUT WEISSERT, ANNE MARIE KARPOFF, MAX F. CARMAN, EDWARD SCHREIBER; Numerical ages of Cenozoic biostratigraphic datum levels: Results of South Atlantic Leg 73 drilling. GSA Bulletin 1984;; 95 (7): 863–876. doi: https://doi.org/10.1130/0016-7606(1984)95<863:NAOCBD>2.0.CO;2 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 Six sites were drilled in the South Atlantic during the Leg 73 cruise of the Deep Sea Drilling Project (DSDP). Hydraulic piston coring at five of the six sites obtained a nearly complete sequence of undisturbed Cenozoic samples. The magnetostratigraphy at those sites was investigated by close sampling representing time intervals of about 104 yr.Most of the Cenozoic nannofossil and many of the foraminiferal zonal boundaries were accurately determined and magnetostratigraphically calibrated at those five Leg 73 boreholes. Their numerical ages have been computed assuming a linear spreading rate and a radiometric age of 66.5 m.y. for the Cretaceous-Tertiary boundary. Alternative magnetostratigraphic ages were obtained with the adoption of a 63.5-m.y. age for the Cenozoic. Our data confirm previous determinations of the Pleistocene-Pliocene boundary at 1.8 (1.7) m.y. B.P. and of the Pliocene-Miocene boundary at 5.1 (5.0) m.y. B.P. The Miocene-Oligocene boundary is placed within chron C-6 C, with a magnetostratigraphic age of 23.8–24.0 (22.7–22.9) m.y. The Oligocene-Eocene age is also very precisely located within chron C-13 R, with a magnetostratigraphic age of 37.1–37.2 (35.5–35.6) m.y. The Eocene-Paleocene boundary should be located within an uncored interval of chron C-24, with a magnetostratigraphic age of 59.0 (55.4) ± 0.2 m.y.A general accord of the magnetostratigraphic ages from Leg 73 sites and the radiometric ages published in the literature for the various zonal boundaries validates the assumption of a linear sea-floor–spreading rate during the Cenozoic. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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Affiliated Institutions

• City University of New York US
• University of Houston US
• École Polytechnique Fédérale de Lausanne CH
• Lamont-Doherty Earth Observatory US
• ExxonMobil (United States) US
• University of Edinburgh GB
• Scripps Institution of Oceanography US

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