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Geological Society, London, Special Publications; 1996; v. 105; p. 195-203;
DOI: 10.1144/GSL.SP.1996.105.01.18
© 1996 Geological Society of London

Central Mediterranean and Carpathians

Ultra-fine magnetostratigraphy of Cretaceous shallow water carbonates, Monte Raggeto, southern Italy

M. Iorio1,2, D. H. Tarling2, B. D’argenio1,3 & G. Nardi3

1 Geomare Sud, Institute of Marine Science, CNR, Via Vespucci 10, Napoli, Italy
2 Department of Geological Sciences, University of Plymouth, PL48AA, UK
3 Dipartimento di Scienze della Terra, Università di Napoli, Largo San Marcellino 10, Napoli, Italy

The sedimentological and palaeomagnetic parameters of bore cores of shallow-water Hauterivian and Barremian carbonates have been defined at 1 cm and 2 cm intervals, respectively. The stability of remanence to alternating fields has been established and a composite 88 m sequence compiled. This shows fine structure polarity changes, with the Hauterivian section being almost entirely of Normal polarity and the Barremian including thick zones of both predominantly Normal and Reversed polarity. Narrow zones of opposite polarity occur throughout. The sedimentological and palaeomagnetic properties are found to exhibit clear cyclicities, which, when normalized, show an extremely high correlation to each other and to the predicted orbital variations for this period. This enables a study of polarity transitions and secular variations using a chronology in which 1 cm is equivalent, on average, to 285 ± 8 years.