New magnetostratigraphic and 40Ar/39Ar dating results from the Suva Marl, Fiji: Calibration of the Early Pliocene geomagnetic polarity time scale

Details New magnetostratigraphic and 40Ar/39Ar dating results from the Suva Marl, Fiji: Calibration of the Early Pliocene geomagnetic polarity time scale New magnetostratigraphic and 40Ar/39Ar dating results from the Suva Marl, Fiji: Calibration of the Early Pliocene geomagnetic polarity time scale

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.151..107c&link_type=abstract

Earth and Planetary Science Letters, Volume 151, Issue 1-2, p. 107-115.

Astronomy and Astrophysics

Astronomy

8

Scientific paper

The Suva Marl (Fiji) provides a rare opportunity to integrate Early Pliocene biostratigraphic, magnetostratigraphic and chronostratigraphic data. We present new paleomagnetic data that extend the previously reported magnetostratigraphy [P. Rodda, I. McDougall, R.A. Cassie, D.A. Falvey, R. Todd, J.A. Wilcoxon, Isotopic ages, magnetostratigraphy, and biostratigraphy from the Early Pliocene Suva Marl, Fiji, Geol. Soc. Am. Bull. 96 (1985) 529-538] of the Suva Marl down section, and suggest a revision of the original correlation with the geomagnetic polarity time scale (GPTS). 40Ar/39Ar laser incremental-heating analyses of mineral separates from the interbedded tuffs yield refined age constraints for previously reported K-Ar dates for the Suva Marl polarity reversals. The new dates and the new magnetostratigraphic data are most consistently interpreted as supporting the revised Early Pliocene polarity time scale [W.A. Berggren, D.V. Kent, C.C. Swisher III, M.P. Aubry, A revised Cenozoic geochronology and chronostratigraphy, in: W.A. Berggren, D.V. Kent, M.P. Aubry, J. Hardenbol (Eds.), Geochronology, Time Scales and Global Stratigraphic Correlation, Soc. Econ. Paleontol. Mineral. Spec. Publ. 54 (1996) 129-212]. The ages of the Suva Marl reversals derived from the 40Ar/39Ar dates provide a revised direct calibration of the early Pliocene GPTS, bringing it in synch with those calibrations produced by orbital tuning of Milankovitch cycles (astronomical time scale).

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