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First U–Pb SHRIMP age of the Hauterivian stage, Neuquén Basin, Argentina |
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| Authors: | M Beatriz Aguirre-Urreta Pablo J Pazos Darío G Lazo C Mark Fanning Vanesa D Litvak |
| Institution: | aDepartment of Geological Sciences, University of Buenos Aires, Ciudad Universitaria, Pabellon 2, 1428 Buenos Aires, Argentina (Conicet);bResearch School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia |
| Abstract: | A high-resolution ion-microprobe (SHRIMP) U–Pb zircon age from a tuff layer intercalated in the ammonoid bearing sedimentary succession of the Neuquén Basin in Argentina provides a robust geochronologic date to add to the absolute ages and to improve the relative chronology of the Early Cretaceous Hauterivian stage. The tuff layer appears interbedded between shales of the upper member (Agua de la Mula) of the Agrio Formation within the Spitidiscus riccardii ammonoid zone (base of the Late Hauterivian) yielding a date of 132.5 ± 1.3 Ma. This date confirms and supports an accurate correlation between the ammonoid biostratigraphy of the Neuquén Basin with the Western Mediterranean Province of the Tethys during the Early Cretaceous and matches with the most recently published time scale. It also casts doubts on the validity of K–Ar ages on glauconite-grains recently reported from the Lower Cretaceous of the Vocontian Basin of France. |
| Keywords: | U– Pb SHRIMP geochronology Biostratigraphy Lower Cretaceous Hauterivian Neuqué n Basin TethysPalabras clave: Geocronologí a U– Pb SHRIMP Bioestratigrafí a Cretá cico inferior Hauteriviano Cuenca Neuquina Tethys |
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