Lower Maastrichtian cyclostratigraphy of the Bidart section (Basque Country, SW France); a remarkable record of precessional forcing

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doi: 10.1016/j.palaeo.2013.12.008
Author(s): Husson, Dorothée; Thibault, Nicolas; Galbrun, Bruno; Gardin, Silvia; Minoletti, Fabrice; Sageman, Brad; Huret, Emilia
Author Affiliation(s): Primary:
Technological Institute, Department of Earth and Planetary Sciences, Evanston, IL, United States
Other:
Université Pierre et Marie Curie, France
University of Copenhagen, Denmark
Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, France
Agence Nationale pour la Gestion des Déchets Radioactifs, France
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.395, p.176-197. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. Includes appendices. 63 refs.; illus., incl. sketch map, 1 table, strat. cols.
Summary: Cyclostratigraphic analysis of the Maastrichtian limestone-marl alternations of Bidart (SW France) allows the hypothesis of orbital control on lithological cycles to be evaluated. Magnetic susceptibility (MS), oxygen and carbon isotope measurements, sampled at a high resolution, are analyzed using various cyclostratigraphic tools. A statistically significant orbital signal is detected, with a remarkable record of the precession corresponding to the limestone-marl couplets. This well expressed orbital forcing allows the building of a relative cyclostratigraphic time scale for the MS and δ13C records based on the 100 kyr eccentricity cycle. The total duration of the section is estimated at 1.44±0.22 Myr. Correlation based on calcareous nannofossil biostratigraphy and comparison of the scaled Bidart δ13C record to the astronomically calibrated δ13C signal of ODP Hole 762C shows that the studied section extends from -71.5 to -70 Ma, covering the upper part of Chron C32n.1 n and 2/3 of Chron C31r. Oxygen isotope data suggest a 2°C cooling of sea-surface temperatures during the studied interval. When placed on the long-term δ18O trend of the Bidart section, this interval is here recognized as the onset of the early Maastrichtian cooling event. With its excellent record of the precessional forcing, the Bidart section, along with other sections of the Basque Country, is a useful tool for the refinement of the Maastrichtian timescale. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Basque Provinces Spain; Biostratigraphy; C-13/C-12; Carbon; Carbonate rocks; Carbonates; Clastic rocks; Climate forcing; Correlation; Cretaceous; Cyclostratigraphy; Data processing; Eccentricity; Europe; Exmouth Plateau; Iberian Peninsula; Indian Ocean; Isotope ratios; Isotopes; Leg 122; Limestone; Lower Maestrichtian; Maestrichtian; Magnetic properties; Magnetic susceptibility; Marl; Mesozoic; Microfossils; Nannofossils; O-18/O-16; ODP Site 762; Ocean Drilling Program; Orbital forcing; Oxygen; Paleoenvironment; Paleomagnetism; Plantae; Precession; Sea-surface temperature; Sedimentary rocks; Southern Europe; Spain; Stable isotopes; Stratigraphy; Upper Cretaceous
Coordinates: S195315 S195314 E1121515 E1121514
N432600 N432700 W0013500 W0013600
Record ID: 2014028514
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands