Geochemistry of Eocene sediments from ODP Site 171-1052 on the Black Nose, Atlantic Ocean

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 magnetostratig...

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Bibliographic Details
Main Authors: Pälike, Heiko, Shackleton, Nicholas J, Röhl, Ursula
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
171-1052
171-1052A
171-1052B
171-1052C
171-1052D
171-1052F
Blake Nose
North Atlantic Ocean
COMPCORE
Composite Core
DRILL
Drilling/drill rig
Joides Resolution
Leg171B
Ocean Drilling Program
ODP
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.713705
https://doi.org/10.1594/PANGAEA.713705
Description
Summary: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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