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Paleogene time scale miscalibration: evidence from the dating of the North Atlantic Igneous Province

Jolley, David W.; Clarke, Benjamin and Kelley, Simon (2002). Paleogene time scale miscalibration: evidence from the dating of the North Atlantic Igneous Province. Geology, 30(1) pp. 7–10.

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Igneous activity in the North Atlantic igneous province began with the arrival of the proto-Iceland plume beneath the lithosphere in early Cenozoic time. Sediments between and equivalent to the oldest lavas contain an influx of a diagnostic pollen flora, an influx of the dinocyst Apectodinium, a benthic foraminiferal extinction, nannofossil zone NP9, and a carbon isotope excursion associated with the late Paleocene thermal maximum (LPTM). Lavas immediately overlying the LPTM strata (54.98 Ma on the current time scale), yield U-Pb and Ar-Ar isotopic dates between 57.5 and 60.54 Ma, highlighting a dating discrepancy of up to 5 m.y. Recognition of this disparity, as well as our biostratigraphical correlation, places the LPTM within the early phase of widespread northeast Atlantic margin basaltic volcanism. A later volcanic phase, equivalent to the seaward-dipping reflector series, terminates at 54 Ma. The onset of 60 Ma basaltic volcanism can be linked to ocean water mass perturbations, and the release of ocean-floor methane hydrates thought responsible for the LPTM.

Item Type: Journal Article
ISSN: 0091-7613
Keywords: North Atlantic; Iceland plume; late Paleocene thermal maximum; Cenozoic time scale
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6854
Depositing User: Users 2315 not found.
Date Deposited: 15 Feb 2007
Last Modified: 02 Dec 2010 19:57
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