Petrography, geochemistry and origin of South Atlantic evaporites: The Brazilian side

Tectono‐stratigraphic evolution of the rift and post‐rift systems in the Northern Campos Basin, offshore Brazil

“…In addition, assuming that the inversion leads to localized (e.g., segments of Guriri Fault system East—GFSE) or generalized (GFSN and footwall complex—FWC) uplift, this could have delayed the onset evaporite deposition over these areas. Consequently, using the basin scale correlations to estimate the age of the onset of evaporite deposition in the context of the study area could be problematic (Davison, 2007; Kukla et al, 2018; Szatmari et al, 2021). Meanwhile, it is possible that there was significant sub‐aerial epigenetic karstification related to the BSU, resulting in secondary porosity in the upper section of post‐rift carbonates.…”

“…This assumption is reinforced by the thick Aptian post-salt sequence described in the Campos Basin (Lima et al, 2018), later studied in detail in the SE Brazilian Margin in Sanjinés et al (2022), who concluded that the Aptian-Albian border is 10 Ma older than previously assumed (Figure 2). If the onset of evaporite deposition occurs between 116 and 110 Ma as suggested by Szatmari et al (2021), it means an at least 9 Myr gap in the base-salt unconformity. Nevertheless, these authors mention the diachronous character of evaporite deposition in the proto-South Atlantic Ocean (see also Farias et al, 2019).…”

“…Therefore, the depositional age of the pre‐salt sequence had been constrained by radiometric data of underlying basalts of the Cabiúnas Formation (Mizusaki et al, 1992) and at its top by the age of the onset of evaporite deposition of the Retiro Formation ( ca . 115 Ma) (Szatmari et al, 2021).…”

“…However, the new constraints for the age of salt thereof have been challenged by a review paper (Szatmari et al, 2021). Their results kept the age of salt deposition within the usual time frame (i.e., 116–110 Ma), based on 39 Ar– 40 Ar ages from evaporites in the Sergipe‐Alagoas basin and a pre‐salt volcano in the southern Santos Basin.…”

“…From the Albian, the deposition of the drift supersequence triggered remarkable thin‐skinned gravitational gliding of salt and related salt compression in the outer regions of the Campos Basin (Davison, 2007; Szatmari et al, 2021).…”