IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina)
Autor/es:
LIMARINO, C.O.; GIORDANO, S.
Revista:
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2016 vol. 66 p. 208 - 231
ISSN:
0895-9811
Resumen:
The aim of this paper is to study the provenance of Late Cretaceous sandstones deposited along the southflank of the Golfo San Jorge Basin. For this purpose, detrital modes of three hundred thirty-sevensandstone samples collected in the Mina del Carmen, Bajo Barreal, and Ca~nadon Seco Formationswere studied in ten oil fields. According to the modal composition of the sandstones, six petrofacies weredefined allowing the identification of not only principal, but also secondary provenance areas. The QVMand VQM petrofacies are more than 20% metamorphic, sedimentary, and polycrystalline quartz clasts(Lm þ Ls þ Qpg > 20%), evidencing a secondary signal of basement supply masked by a predominantvolcanic provenance. The petrofacies VP and VF are characterized by Lm þ Ls þ Qpg 20%.), which indicate a supply of sediment from volcanic terrains andscarce derivation of materials from basement rocks. Based on the plagioclase/k-feldspar ratio, the VFpetrofacies is interpreted to be dominated by the supply of sand grains from the Andean volcanic-arc,while VP is supposed have originated through the erosion of intermediate volcanic rock outcroppingsin the Macizo del Deseado. Finally, both the VQ and QV petrofacies show Lm þ Ls þ Qpg