Integrated biomagnetochronology for the Palaeogene of ODP Hole 647A: implications for correlating palaeoceanographic events
from high to low latitudes
J. V. Firth
J. S. Eldrett
I. C. Harding
H. K. Coxall
B. S. Wade
10.6084/m9.figshare.3453119.v1
https://geolsoc.figshare.com/articles/dataset/Integrated_biomagnetochronology_for_the_Palaeogene_of_ODP_Hole_647A_implications_for_correlating_palaeoceanographic_events___from_high_to_low_latitudes/3453119
<p>Lower Eocene to Oligocene microfossil-rich hemipelagic sediments in ODP Hole 647A, southern Labrador Sea, provide a strategic
section for resolving the early history of high North Atlantic climates and ocean circulation, and for correlating with carbonate-poor
lower Cenozoic sediments in the Arctic and Nordic seas. Our new, integrated palaeomagneto- and multigroup biostratigraphy
(63 dinoflagellate cyst, calcareous nannofossil, planktonic foraminifer and diatom datums) significantly improves Site 647
chronostratigraphy and provides a framework for future studies. This new age model, coupled with provisional δ<sup>18</sup>O analyses, provides greater confidence in the location of significant ocean-climate events at this site, including the Eocene–Oligocene
transition and the Middle Eocene Climatic Optimum. Early Eocene hyperthermals may also be present near the base of the section.
Palaeomagnetic age control is significantly improved in the Eocene, but not in the Oligocene. Revised estimates of sedimentation
and biogenic flux indicate changes in supply and preservation that may be climatically controlled. A Lower to Middle Eocene
hiatus is more precisely constrained, with a <em>c.</em> 4 million year duration. Age and depth errors quantify the age uncertainties throughout the section. Our revised age model
will play an important role in stratigraphic correlation between very high latitude and lower latitude sites.
</p>
2016-06-21 11:09:24
ODP Hole 647
latitude
Middle Eocene hiatus
Site 647 chronostratigraphy
section
Middle Eocene Climatic Optimum
δ 18 O analyses
Palaeomagnetic age control
North Atlantic climates
age model
Geology