IDEAN 23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
artículos
Título:
A high precision U-Pb radioisotopic age for the Agrio Formation, Neuquén Basin, Argentina: implications for the chronology of the Hauterivian Stage
Autor/es:
AGUIRRE-URRETA, M.B.; TUNIK, M.; SCHMITZ, M.; BUHLER, M.; RAWSON, P.; RAMOS, V.; LESCANO, M.; CONCHEYRO, A.
Revista:
CRETACEOUS RESEARCH (PRINT)
Editorial:
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2017 vol. 75 p. 193 - 204
ISSN:
0195-6671
Resumen:
A new CA-ID TIMS U-Pb age of 130.39 ± 0.16 Ma is presented here from thePilmatué Member of the Agrio Formation, lower Hauterivian of the Neuquén Basinin west-central Argentina. This high precision radioisotopic new age, togetherwith the two former ones from the upper Hauterivian Agua de la Mula Member ofthe Agrio Formation and modern cyclostratigraphic studies in the classicalsections of the Mediterranean Province of the Tethys indicate that theHauterivian Stage spans some 6 Ma, starting ca. 132 Ma and ending ca.126 Ma.These radioisotopic ages are tied to ammonite biostratigraphy and calcareousnannofossil bioevents and biozones recognized in the Neuquén Basin which inturn are correlated with the Mediterranean standard zones. A new geologicaltime scale for the Valanginian?Hauterivian stages in the Mediterranean regionintegrating astrochronological and radiochronological data differs with thecurrent official geological time scale which still maintains poorly constraintabsolute ages for the Berriasian-Aptian interval.
