Petrography and tectonic provenance of the Permian Tunas Formation: Implications on the paleotectonic setting during the Claromeco Foreland Basin evolution, southwestern Gondwana margin, Argentina

FEBBO B.; TOMEZZOLI, R.N.; CESARETTI, N.N.; CHOQUE, G.; NATALIA FORTUNATTI; ARZADÚN, G

Journal of Palaeogeography

Elsevier

Lugar: Beijing; Año: 2022 vol. 11 p. 1 - 21

2095-3836

The Claromeco Basin is located at the south-western sector of the Buenos Aires province, Argentina. This basin is considered a foreland basin closely related to the evolution of the southwestern Gondwana margin. This contribution focuses on the provenance analysis of the Tunas Formation (Permian, Pillahuinco Group), which represents the last filling stage for the Claromeco Foreland Basin. Petrographic and tectonic provenance analyses were performed in sandstones recovered from subsurface (PANG 0001 and PANG 0003 exploration wells) and outcrops located close to the basin center (Gonzales Chaves locality). In the subsurface, the analyzed succession is composed of medium- to fine-grained sandstones interbedded withtuffs, mudrocks, carbonaceous mudrocks and coal beds. In outcrops, the succession is dominated by mediumto fine-grained sandstones interbedded with siltstones. Modal composition patterns are distributed into the recycled orogen and transitionally recycled to mixed fields. Petrographic analyses, in addition to provenance and sedimentological studies, confirm that sedimentary material was derived from a mixed source, which largely comes from the Sierras Australes fold and thrust belt, located towards the WeSW, where the sedimentary succession is interbedded with volcanic material. The Tunas Formation shows clear differences in its modal composition, paleocurrent direction and paleoenvironmental conditions with respect to the underlying