| Texto completo | |
| Autor(es): |
Ferreyra, C.
;
Christofoletti, B.
;
Penzo, V.
;
Antunes, G. C.
;
Warren, L. V.
;
Arrouy, M. J.
;
Poire, D. G.
;
Gomez-Peral, L. E.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of South American Earth Sciences; v. 169, p. 13-pg., 2026-01-01. |
| Resumo | |
Following the development of the Piedra Amarilla Surface (PAS), where a major karstic unconformity formed during prolonged subaerial exposure, the Tandilia System underwent a profound paleoenvironmental shift in the early Ediacaran. These changes are recorded in the Colombo and Cerro Largo formations, which overlie the PAS and represent a large-scale transgressive-regressive cycle in the Sierras Bayas Group. This cycle begins with post-glacial deposits and culminates in a high-energy, storm-dominated shoreline system, marking a major reorganization of depositional environments in the basin. Sedimentological, stratigraphic, and paleocurrent analyses from eight measured sections identified twelve lithofacies, grouped into four facies associations, arranged in a coarsening-upward pattern from glacimarine deposits (FA-1) to offshore-transition deposits (FA-2), and finally to storm-wave and fair-weather-wave dominated shoreface deposits (FA-3 and FA-4, respectively). Paleocurrent data indicate a NE-SW-oriented paleoshoreline, with deeper marine areas toward the W-NW, in agreement with regional paleogeographic reconstructions. In this high-energy context, microbial mats played a key role in stabilizing substrates and preserving small-scale delicate sedimentary structures. The interpreted depositional model highlights the development of a high-energy overlaying shoreline glacimarine deposits and the dynamic interplay between storm and fair-weather wave processes in shaping early Ediacaran littoral systems. (AU) | |
| Processo FAPESP: | 23/14578-6 - Origem dos substratos marinhos Fanerozoicos e controles paleoambientais da Revolução Agronômica na transição Ediacarano-Cambriano |
| Beneficiário: | Lucas Verissimo Warren |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 24/02446-0 - Origem e evolução sedimentar dos mega-lagos do SW de Gondwana |
| Beneficiário: | Beatriz Christofoletti |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |