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Integrated correlation of the Camaquã Basin (Southernmost Brazil) with other Ediacaran units of southwestern Proto-Gondwana

2022; Elsevier BV; Volume: 116; Linguagem: Inglês

10.1016/j.jsames.2022.103812

1873-0647

Ilana Lehn, Paulo Sérgio Gomes Paim, Farid Chemale,

Geological formations and processes

Ediacaran organic-walled microfossils (OWM) were recently reported for the Camaquã Basin. Sphaeromorphic acritarchs, such as Leiosphaeridia sp, Lophosphaeridium sp. and Germinosphaera , as well as one kind of ornamented microfossil ( Tanarium irregulare ) were extracted from rocks of either marine (Maricá Group) or continental (Bom Jardim, Santa Bárbara groups) depositional systems. The stratigraphic distribution of organic-walled microfossils within well age-constrained siliciclastic successions made it possible to correlate these microfossils with other coeval Ediacaran assemblages in the world, especially in southwestern Proto-Gondwana. This comparison has shown similarities and differences among them. The Camaquã Basin microfossils register a more extended time interval, but present a smaller diversification than the other assemblages, probably due to have lived within more stressing environments. These differences led us to create a new microfossil assemblage, the CAMBAP (Camaquã Basin Palynoflora) Assemblage, which represents an ecozone , with cosmopolitan microfossils living closely associated with microbial mats . • Correlation with SW Gondwana basins indicate microfossil similarities and differences. • Camaquã Basin palynoflora assemblage were recovered from marine and lacustrine strata. • Small and low diversified acritarchs in Middle and Late Ediacaran siliciclastic succession.