Geochemistry of Eocene sediments from ODP Site 171-1052 on the Black Nose, Atlantic Ocean, supplement to: Pälike, Heiko; Shackleton, Nicholas J; Röhl, Ursula (2001): Astronomical forcing in late Eocene sediments. Earth and Planetary Science Letters, 193(3-4), 589-602


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.

Related Identifier
Metadata Access
Creator Pälike, Heiko; Shackleton, Nicholas J; Röhl, Ursula
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2001
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 13 datasets
Discipline Earth System Research
Spatial Coverage (-76.627W, 29.951S, -76.627E, 29.951N); Blake Nose, North Atlantic Ocean
Temporal Coverage Begin 1997-01-30T00:00:00Z
Temporal Coverage End 1997-02-06T04:30:00Z