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Astronomical forcing in late Eocene marine sediments

Pälike, H., Shackleton, N.J. and Röhl, U. (2001) Astronomical forcing in late Eocene marine sediments Earth and Planetary Science Letters, 193, (3-4), pp. 589-602. (doi:10.1016/S0012-821X(01)00501-5).

Record type: Article

Abstract

We use an X-ray fluorescence (XRF) Core Scanner to obtain records of elemental concentrations in sediment cores from Ocean Drilling Program (ODP) Leg 171B, Site 1052 (Blake Nose, Atlantic margin of northern Florida).This record spans the Middle to Late Eocene, as indicated by bio- and magnetostratigraphy, and displays cyclicity that can be attributed to the orbital forcing of a combination of climate, ocean circulation, or productivity. We use the XRF counts of iron and calcium as a proxy of the relative contribution from calcium carbonate and terrestrial material to construct a new composite depth record. This new composite depth record provides the basis to extend the astronomically calibrated geological time scale into the Middle Eocene and results in revised estimates for the age and duration of magnetochrons C16 through C18. In addition, we find an apparent change in the dominance of orbitally driven changes in obliquity and climatic precession at around 36.7 Ma on our new time scale. Long term amplitude modulation patterns of eccentricity and obliquity in the data do not seem to match the current astronomical model any more, suggesting the possibility of new constraints on astronomical calculations.

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Published date: 2001
Keywords: ODP, Site 1052, geochronology, cyclostratigraphy, Milankovitch theory, obliquity of the ecliptic, precession, orbits, Eocene

Identifiers

Local EPrints ID: 13487
URI: http://eprints.soton.ac.uk/id/eprint/13487
ISSN: 0012-821X
PURE UUID: 9fb3f252-9849-4af8-9842-df567853607c

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Date deposited: 07 Dec 2004
Last modified: 17 Jul 2017 17:02

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Contributors

Author: H. Pälike
Author: N.J. Shackleton
Author: U. Röhl

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