Astronomical calibration of the Maastrichtian (Late Cretaceous)

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doi: 10.1016/j.epsl.2011.03.008
Author(s): Husson, Dorothée; Galbrun, Bruno; Laskar, Jacques; Hinnov, Linda A.; Thibault, Nicolas; Gardin, Silvia; Locklair, Robert E.
Author Affiliation(s): Primary:
Université Pierre et Marie Curie, Institut des Sciences de la Terre-Paris, Paris, France
Other:
Observatoire de Paris, France
Johns Hopkins University, United States
University of Copenhagen, United States
Université Pierre et Marie Curie, France
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 305(3-4), p.328-340. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Supplemental data available in online version. 80 refs.; illus., incl. 3 tables, sketch map
Summary: Recent improvements to astronomical modeling of the Solar System have contributed to important refinements of the Cenozoic time scale through astronomical calibration of sedimentary series. We extend this astronomical calibration into the Cretaceous, on the base of the 405 ka orbital eccentricity variation thanks to the recovery of well preserved Maastrichtian sedimentary series from ODP (Ocean Drilling Program) Holes 1258A (Leg 207, Equatorial Atlantic), 1267B (Leg 208, South Atlantic), 762C (Leg 122, Indian Ocean) and DSDP (Deep Sea Drilling Program) Hole 525A (Leg 74, South Atlantic). Cyclostratigraphic analysis is performed on high resolution measurements of magnetic susceptibility on sediments cored during Legs 207 and 208, and gray level variations of sediment color obtained from core photographs from Legs 122 and 74. Astronomical control on sedimentation is evident at every site, with the presence of cycles corresponding to forcing by precession, obliquity and orbital eccentricity variations. Identification of these cycles leads to the definition of a detailed cyclostratigraphic frame covering nearly 8 Ma, from the upper Campanian to the Cretaceous/Paleogene (K/Pg) boundary. Durations of each magnetochron from C32r.2r to C29n are inferred by cycle counting. Astronomical calibrations of Maastrichtian sedimentary series are proposed, based on the 405ka eccentricity variation according to the most recent astronomical solution La2010a. Two different ages are suggested for the K/Pg boundary, considering the uncertainty of the long-term variation of the 405 ka eccentricity cycle. The first proposal provides a Cretaceous/Paleogene boundary age of 65.59±0.07 Ma and the second an age of 66±0.07 Ma, which is coherent with the most recent radio-isotopic datings. Magnetochron boundaries and the Campanian/Maastrichtian boundary are dated relative to these numerical ages of the K/Pg boundary. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 03 Geochronology; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Calibration; Cenozoic; Cretaceous; Cyclostratigraphy; DSDP Site 525; Deep Sea Drilling Project; Demerara Rise; Eccentricity; Equatorial Atlantic; Exmouth Plateau; Geochronology; IPOD; Indian Ocean; K-T boundary; Leg 122; Leg 207; Leg 208; Leg 74; Lower Paleocene; Maestrichtian; Magnetic properties; Magnetic susceptibility; Marine sediments; Mesozoic; North Atlantic; Northwest Atlantic; ODP Site 1258; ODP Site 1267; ODP Site 762; Obliquity of the ecliptic; Ocean Drilling Program; Orbits; Paleocene; Paleogene; Paleomagnetism; Sediments; Senonian; Solar system; South Atlantic; Stratigraphic boundary; Tertiary; Upper Cretaceous; Walvis Ridge; West Atlantic
Coordinates: N092600 N092600 W0544400 W0544400
S280600 S280600 E0014300 E0014200
S290415 S290414 E0025908 E0025907
S195315 S195314 E1121515 E1121514
Record ID: 2011064347
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands