Paleogene stable isotopes events

Author(s): Shackleton, Nicholas J.
Author Affiliation(s): Primary:
Univ. Cambridge, Godwin Lab., Cambridge, United Kingdom
Volume Title: Boundaries and events in the Paleogene
Volume Author(s): Shackleton, Nicholas J., editor
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 57(1), p.91-102; European Union of Geosciences symposium on Boundaries and events in the Paleogene, Strasbourg, France, April 1-4, 1985, edited by Nicholas J. Shackleton. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 40 refs.; charts
Summary: The oxygen isotope record in Paleogene benthic Foraminifera shows that at the base of the Paleogene the ocean deep waters had a temperature of about 10 C, rising to about 12 C at the base of the Eocene and cooling between 51 Ma and 49 Ma to about 9 C. The most dramatic event occurred just after the Eocene/Oligocene boundary, at about 35.8 Ma, when ocean deep waters cooled by several degrees within 10,000-100,000 yr, probably in association with temporary glaciation in the antarctic region. Another more intense glacial event in Antarctica may have occurred later in the Oligocene, at about 31 Ma and a third near the top of the Oligocene at 24 Ma. In the marine carbon isotope record a very rapid negative excursion occurred precisely at the Cretaceous/Tertiary boundary. A recovery to unusually positive values in the Late Paleocene was followed by a second negative excursion close to the Paleocene/Eocene boundary that was even more extreme in magnitude although it was not as rapid. These major carbon isotope events permit very accurate stratigraphic correlation; there are many other smaller features in the carbon isotope record that will also prove useful for this purpose. (Auth.)
Year of Publication: 1986
Research Program: DSDP Deep Sea Drilling Project
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Benthic taxa; Biochemistry; Biostratigraphy; C-13/C-12; Carbon; Cenozoic; Chronostratigraphy; Cores; Correlation; Cretaceous; Deep Sea Drilling Project; Eocene; Foraminifera; Geochemistry; Invertebrata; Isotopes; Lower Oligocene; Marine sediments; Mesozoic; Microfossils; O-18/O-16; Oligocene; Oxygen; Paleo-oceanography; Paleogene; Protista; Sediments; South Atlantic; Stable isotopes; Stratigraphic boundary; Stratigraphy; Tertiary; Upper Cretaceous; Upper Eocene
Record ID: 1987020980
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

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