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Abstract:

The aim of this paper is to study the provenance of Late Cretaceous sandstones deposited along the south flank of the Golfo San Jorge Basin. For this purpose, detrital modes of three hundred thirty-seven sandstone samples collected in the Mina del Carmen, Bajo Barreal, and Cañadón Seco Formations were studied in ten oil fields. According to the modal composition of the sandstones, six petrofacies were defined allowing the identification of not only principal, but also secondary provenance areas. The QVM and VQM petrofacies are more than 20% metamorphic, sedimentary, and polycrystalline quartz clasts (Lm + Ls + Qpg > 20%), evidencing a secondary signal of basement supply masked by a predominant volcanic provenance. The petrofacies VP and VF are characterized by Lm + Ls + Qpg <20% and more than 20% total feldspar (Pm + Om >20%.), which indicate a supply of sediment from volcanic terrains and scarce derivation of materials from basement rocks. Based on the plagioclase/k-feldspar ratio, the VF petrofacies 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 outcroppings in the Macizo del Deseado. Finally, both the VQ and QV petrofacies show Lm + Ls + Qpg <20% and Pm + Om<20%, indicating a provenance of volcanic areas coupled with minor contributions from basement rocks. During the Late Cretaceous, the Golfo San Jorge Basin underwent a sag phase that was characterized by very scarce volcanism and tectonic activity. Although these conditions did not favor defined patterns in the vertical stacking of petrofacies, the sandstones exhibit remarkable changes in their regional distribution, which were determined by the paleogeography of the basin and differences in basement composition within the source areas. Finally, a paleogeographic model for sediment circulation in the basin is proposed. This model recognizes the main fluvial dispersal trends that flowed northwest to southeast and transported large amounts of volcanic clasts (associated with petrofacies VF-VQ). To the extent that rivers flowed eastward, a secondary supply from the Precambrian basement, which were composed of low-to high-grade metamorphic rocks, was also important (petrofacies association VQM and QVM). The southwestern area of the basin is dominated by VP petrofacies that record the supply of plagioclase-rich volcanic clasts. This petrofacies likely corresponds to the erosion of Jurassic volcanic units that crop out in the Macizo del Deseado. © 2016 Elsevier Ltd.

Registro:

Documento: Artículo
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:Limarino, C.O.; Giordano, S.R.
Filiación:Departamento de Geología, Universidad de Buenos Aires, IGEBA-CONICET, Pabellón II Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, 1428, Argentina
Sinopec Argentina Exploration and Production Inc, Manuela Saenz 323, Puerto Madero, Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:Argentina; Geochemistry; Petrofacies; Provenance; San Jorge Basin; chemical composition; feldspar; petrofabric; plagioclase; provenance; sandstone; sediment chemistry; tectonic setting; volcanism; Argentina; Atlantic Ocean; San Jorge Basin; San Jorge Gulf
Año:2016
Volumen:66
Página de inicio:208
Página de fin:231
DOI: http://dx.doi.org/10.1016/j.jsames.2016.01.006
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v66_n_p208_Limarino

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Citas:

---------- APA ----------
Limarino, C.O. & Giordano, S.R. (2016) . Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina). Journal of South American Earth Sciences, 66, 208-231.
http://dx.doi.org/10.1016/j.jsames.2016.01.006
---------- CHICAGO ----------
Limarino, C.O., Giordano, S.R. "Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina)" . Journal of South American Earth Sciences 66 (2016) : 208-231.
http://dx.doi.org/10.1016/j.jsames.2016.01.006
---------- MLA ----------
Limarino, C.O., Giordano, S.R. "Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina)" . Journal of South American Earth Sciences, vol. 66, 2016, pp. 208-231.
http://dx.doi.org/10.1016/j.jsames.2016.01.006
---------- VANCOUVER ----------
Limarino, C.O., Giordano, S.R. Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina). J. South Am. Earth Sci. 2016;66:208-231.
http://dx.doi.org/10.1016/j.jsames.2016.01.006