DOI: http://dx.doi.org/10.5027/andgeo%25x

Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera

Gustavo Gabriel Voldman, Juan Luis Alonso, Luis Pedro Fernández, Gladys Ortega, Guillermo Luis Albanesi, Aldo Luis Banchig, Raúl Cardó

Abstract


The Rinconada Fm is a mélange that crops out in the eastern margin of the Argentine Precordillera, an exotic terrane accreted to Gondwana in Ordovician times. Its gravity-driven deposits have been studied by means of conodont and graptolite biostratigraphy, and complemented with stratigraphic analyses. 46 rock samples (85 kg total weight) were obtained from blocks of limestones and of carbonate-cemented quartz-arenites, and from limestone clasts included in conglomerate blocks and debrites. 16 of these samples were productive after standard laboratory acid procedures, yielding 561 conodont elements. The specimens occur in variable number per sample and are frequently fragmented, but they reveal the occurrence of phantom stratigraphic units in the Darriwilian of the Precordillera. Lithological and fossil evidence from the Rinconada Fm provide new constraints on the biostratigraphy, palaebiogeography and tectonostratigraphic history of the southwestern margin of Gondwana during the Ordovician to Lower Devonian times.

Keywords


conodont; graptolite; biostratigraphy; Rinconada Formation; mélange; Argentine Precordillera; Ordovician; Silurian

How to cite this article Voldman, G., Alonso, J., Fernández, L., Ortega, G., Albanesi, G., Banchig, A., and Cardó, R., 2018, Tips on the SW-Gondwana margin: Ordovician conodont-graptolite biostratigraphy of allochthonous blocks in the Rinconada mélange, Argentine Precordillera: Andean Geology, v. 45, no. 3, p. 399-409., doi:http://dx.doi.org/10.5027/andgeo%x