The Lower Cretaceous Chañarcillo and Neuquén Andean basins: ammonoid biostratigraphy and correlations

Authors

  • M. Beatriz Aguirre-Urreta,

    Corresponding author
    1. Laboratorio de Bioestratigrafía de Alta Resolución, FCEyN, Universidad de Buenos Aires, CONICET, Ciudad Universitaria, Buenos Aires 1428, Argentina
    • Laboratorio de Bioestratigrafía de Alta Resolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón II, Buenos Aires 1428, Argentina.
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  • F. Amaro Mourgues,

    1. Servicio Nacional de Geología y Minería, Av. Santa María 0104, Providencia, Santiago, Chile
    2. IRD–LMTG Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France
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  • Peter F. Rawson,

    1. Department of Earth Sciences, University College London, Gower Street WC1E 6BT, London, UK
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  • Luc G. Bulot,

    1. FRE CNRS 2761, Centre de Sédimentologie-Paléontologie, Université de Provence, F-13331 Marseille cedex, France
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  • Etienne Jaillard

    1. IRD–LGCA, Maison des Géosciences, BP 53, 38 041 Grenoble Cedex 9, France
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Abstract

The Chañarcillo and Neuquén basins of the Central Andes shared a common geological history in the earlier part of the Early Cretaceous but from Barremian times onward their evolution began to diverge, probably due to an increasing activity of an intervening volcanic arc. The Berriasian to Lower Barremian sequences were mainly marine and include rich ammonoid faunas, with many taxa in common to both the basins. They include both Andean and near-pandemic forms, the latter providing some good correlation levels with the ‘standard’ Mediterranean sequence. Marine conditions persisted in the Chañarcillo Basin till Early Albian times; the associated ammonoid faunas include pandemic, Pacific and Antarctic genera. In contrast, in the Neuquén Basin evaporites and continental clastics of the Huitrín Formation mark the beginning of a long disconnection with the Pacific Ocean, though a short-lived marine incursion is represented by the carbonates of La Tosca Member of the Huitrín Formation. The ammonoid faunas of the two basins are compared here, and a detailed biostratigraphic division of the sequences is discussed and compared with the Mediterranean succession. Copyright © 2007 John Wiley & Sons, Ltd.

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