Journal ArticleDOI
Integrated chronostratigraphic calibration of the Oligocene-Miocene boundary at 24.0 ± 0.1 Ma from the CRP-2A drill core, Ross Sea, Antarctica
Gary S. Wilson,M. Lavelle,William C. McIntosh,Andrew P. Roberts,David M. Harwood,David K. Watkins,Giuliana Villa,Steven M Bohaty,Christopher R. Fielding,Fabio Florindo,Leonardo Sagnotti,Tim R Naish,Reed P. Scherer,Kenneth L. Verosub +13 more
TLDR
In this paper, an expanded Oligocene-Miocene boundary interval recovered in the Cape Roberts Project CRP-2A core from beneath the Ross Sea, Antarctica, has yielded a high-resolution integrated chrono stratigraphy that has, in turn, enabled a new, more direct, calibra tion of magnetic polarity and biostratigraphic events.Abstract:
An expanded Oligocene-Miocene boundary interval recovered in the Cape Roberts Project CRP-2A core from beneath the Ross Sea, Antarctica, has yielded a high-resolution integrated chrono stratigraphy that has, in turn, enabled a new, more direct, calibra tion of magnetic polarity and biostratigraphic events. The Oligocene-Miocene boundary interval in the CRP-2A core comprises three ∼60-m-thick, rapidly deposited (>0.5 m/k.y.) sedimentary sequences (sequences 9, 10, and 11). In sequences 10 and 11, single-crystal, laser-fusion 40Ar/39Ar analyses of anorthoclase phenocrysts from two tephra horizons independently calibrate the CRP-2A magnetic-polarity stratigraphy and age model. Sequences 10 and 11 encompass subchron C6Cn.3n, which is dated as 24.3 ± 0.1 to 24.16 ± 0.1 Ma. Sequence 9 is interpreted to encompass subchron C6Cn.2n and the Oligocene-Miocene boundary, which is dated as 24.0 ± 0.1 Ma. These ages are ∼0.2 m.y. older than those of the geomagnetic polarity time scale calibrated from seafloor-spreading ridges and ∼0.9–1.3 m.y. older than the newly proposed astronomically calibrated ages. We contend that the discrepancy with the astronomically calibrated ages arises from a mismatch of three 406 k.y. eccentricity cycles or a 1.2 m.y. modulation of obliquity amplitude in the astronomical calibration of the Oligocene–Miocene time scale.read more
Citations
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Advanced methods for analysing and modelling multivariate palaeoclimatic time series
TL;DR: In this paper, a linear principal component analysis is used to decompose the data set into suitable fractions whose temporal variability correlates well with the variations of the average solar insolation on millenial to multi-millenial time scales.
Journal ArticleDOI
New Data on Diatoms from the Marine Paleogene of Western Kamchatka
TL;DR: In this article, the authors studied diatom assemblages from the marine Paleogene of Western Kamchatka (the Kovachina, Viventek, and Kuluven formations).
The Oligocene–Miocene Boundary – Antarctic Climate Response to Orbital Forcing
TL;DR: Wilson et al. as mentioned in this paper used high-resolution Oligocene-Miocene oxygen isotopic records revealed a relatively transient, ca. 2myr period, 1m amplitude cyclicity in isotopic values (Oi and Mi events, respectively).
Journal ArticleDOI
Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL-2A Drill Core
Luigi Jovane,Luigi Jovane,Fabio Florindo,Fabio Florindo,Gary D Acton,Christian Ohneiser,Leonardo Sagnotti,Eleonora Strada,Kenneth L. Verosub,Gary S. Wilson,Francesco Iacoviello,Francesco Iacoviello,Richard H. Levy,Sandra Passchier +13 more
Journal ArticleDOI
Eocene–Oligocene paleoecology and the diatom genus Kisseleviella Sheshukova-Poretskaya from the Victoria Land Basin, Antarctica
TL;DR: The Cape Roberts Project (CRP) recovered a composite Eocene to lower Miocene stratigraphic sequence from the Victoria Land Basin, Antarctica, which includes four new species, described herein, of the biostratigraphically useful fossil marine diatom genus Kisseleviella as mentioned in this paper.
References
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Journal ArticleDOI
Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic
Steven C. Cande,Dennis V. Kent +1 more
TL;DR: An adjusted geomagnetic reversal chronology for the Late Cretaceous and Cenozoic is presented that is consistent with astrochronology in the Pleistocene and Pliocene and with a new timescale for the Mesozoic.
Book ChapterDOI
A revised Cenozoic geochronology and chronostratigraphy
TL;DR: Cande and Kent as mentioned in this paper presented a revised (integrated magnetobiochronologic) Cenozoic time scale (IMBTS) based on an assessment and integration of data from several sources.
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Least squares fitting of a straight line with correlated errors
TL;DR: In this paper, the fitting of a straight line when both variables are subject to crrors is generalized to allow for correlation of the z and y errors, illustrated by reference to lead isochron fitting.
Journal ArticleDOI
A new geomagnetic polarity time scale for the Late Cretaceous and Cenozoic
Steven C. Cande,Dennis V. Kent +1 more
TL;DR: In this article, the relative widths of the magnetic polarity intervals for the entire Late Cretaceous and Cenozoic have been systematically determined from magnetic profiles from the world's ocean basins.
Journal ArticleDOI
Strontium Isotope Stratigraphy: LOWESS Version 3: Best Fit to the Marine Sr‐Isotope Curve for 0–509 Ma and Accompanying Look‐up Table for Deriving Numerical Age
TL;DR: An improved and updated version of the statistical LOWESS fit to the marine 87Sr/86Sr record and a revised look-up table (V3:10/99; available from jmcarthur@ucl.ac.uk) is presented in this article.
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