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Geology; January 2002; v. 30; no. 1; p. 7-10; DOI: 10.1130/0091-7613(2002)030<0007:PTSMEF>2.0.CO;2
© 2002 Geological Society of America
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Paleogene time scale miscalibration: Evidence from the dating of the North Atlantic igneous province

David W. Jolley1, Benjamin Clarke2 and Simon Kelley3

1 Centre for Palynology, University of Sheffield, Brook Hill, Sheffield S3 7HF, UK
2 Department of Earth Sciences, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK
3 Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK

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.

Key Words: North Atlantic • Iceland plume • late Paleocene thermal maximum • Cenozoic time scale




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Geology, May 1, 2003; 31(5): 468 - 469.


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