Astronomical calibration of upper Campanian-Maastrichtian carbon isotope events and calcareous plankton biostratigraphy in the Indian Ocean (ODP Hole 762C); implication for the age of the Campanian-Maastrichtian boundary

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doi: 10.1016/j.palaeo.2012.03.027
Author(s): Thibault, Nicolas; Husson, Dorothée; Harlou, Rikke; Gardin, Silvia; Galbrun, Bruno; Huret, Emilia; Minoletti, Fabrice
Author Affiliation(s): Primary:
University of Copenhagen, Department of Geography and Geology, Copenhagen, Denmark
Université Pierre et Marie Curie, France
National Agency for Radioactive Waste Management, France
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.337-338, p.52-71. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 109 refs.; illus., incl. sects., strat. cols., 2 plates, 4 tables, geol. sketch map
Summary: An integrated framework of magnetostratigraphy, calcareous microfossil bio-events, cyclostratigraphy and δ13C stratigraphy is established for the upper Campanian-Maastrichtian of ODP Hole 762C (Exmouth Plateau, Northwestern Australian margin). Bulk-carbonate δ13C events and nannofossil bio-events have been recorded and plotted against magnetostratigraphy, and provided absolute ages using the results of the cyclostratigraphic study and the recent astronomical calibration of the Maastrichtian. Thirteen carbon-isotope events and 40 nannofossil bio-events are recognized and calibrated with cyclostratigraphy, as well as 14 previously published foraminifer events, thus constituting a solid basis for large-scale correlations. Results show that this site is characterized by a nearly continuous sedimentation from the upper Campanian to the K-Pg boundary, except for a 500 kyr gap in magnetochron C31n. Correlation of the age-calibrated δ13C profile of ODP Hole 762C to the δ13C profile of the Tercis les Bains section, Global Stratotype Section and Point of the Campanian-Maastrichtian boundary (CMB), allowed a precise recognition and dating of this stage boundary at 72.15±0.05 Ma. This accounts for a total duration of 6.15±0.05 Ma for the Maastrichtian stage. Correlation of the boundary level with northwest Germany shows that the CMB as defined at the GSSP is ∼800 kyr younger than the CMB as defined by Belemnite zonation in the Boreal realm. ODP Hole 762C is the first section to bear at the same time an excellent recovery of sediments throughout the upper Campanian-Maastrichtian, a precise and well-defined magnetostratigraphy, a high-resolution record of carbon isotope events and calcareous plankton biostratigraphy, and a cyclostratigraphic study tied to the La2010a astronomical solution. This section is thus proposed as an excellent reference for the upper Campanian-Maastrichtian in the Indian Ocean. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Biostratigraphy; C-13/C-12; Calibration; Campanian; Carbon; Chemostratigraphy; Chronostratigraphy; Cores; Correlation; Cretaceous; Cyclostratigraphy; Data integration; Exmouth Plateau; Foraminifera; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 122; Maestrichtian; Magnetostratigraphy; Marine sediments; Mesozoic; Microfossils; Nannofossils; ODP Site 762; Ocean Drilling Program; Paleoclimatology; Plantae; Protista; Sediments; Senonian; Stable isotopes; Stratigraphic boundary; Stratotypes; Upper Campanian; Upper Cretaceous
Coordinates: S195315 S195314 E1121515 E1121514
Record ID: 2012081495
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands