The Glaciations in South America

The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

“…The Pre‐Morro Azul unconformity is interpreted as a regional disconformity (Santos, Leandro, et al, 2021) and considered to be Neoproterozoic in age (Santos et al, 2022), possibly related to the Marinoan glaciation (650–632,3 ± 5.9 Ma). This disconformity is similar to the Piedra Amarilla Surface, described in units deposited on the Río de la Plata craton margins (Gómez‐Peral et al, 2017, 2021; Poiré et al, 2018).…”

“…The paleoweathering surfaces of regional significance have helped to reconstruct several landscapes in many parts of the world (e.g. Amorosi et al, 2021; Firman, 1994; Gómez‐Peral et al, 2021; Liivamägi et al, 2021; Poiré et al, 2018; Rossetti, 2004; Stafford, 2007; Twidale, 1985), and their distribution can be used as an additional tool for stratigraphic correlations, in addition to establish surface evolution and its climatic interplay through time (Amorosi et al, 2021; Raigemborn et al, 2022; Rossetti, 2004). These surfaces are particularly well‐developed on continent and continental margin areas, where weathering can act continuously for long periods of time, resulting in the formation of mature and/or deep weathering profiles (Ai et al, 2020; Costa, 1991; Liivamägi et al, 2021; Owliaie et al, 2006; Rossetti, 2004).…”

“…The Neoproterozoic paleoweathered surfaces also proved to be very useful as stratigraphic intra‐ and interbasinal markers (Gómez‐Peral et al, 2014; Gómez‐Peral et al, 2017; Poiré et al, 2018; Santos, Leandro, et al, 2021), and their paleoenvironmental significance might be directly related to the inter‐ or deglaciation periods (Hoffman et al, 1998; Pierrehumbert et al, 2011). Moreover, the deglaciations are normally accompanied by substantial rises in temperature and precipitation, consequently increasing soil development rates on the cratonic blocks and its remobilisation (e.g.…”

Paleomagnetismo, estratigrafia magnética e sedimentologia do Ediacarano na Formação Avellaneda (Argentina)

“…A major regression marks the end of the Sierras Bayas Group, with the development of the erosive Barker surface on the Loma Negra limestones. This big drop in sea-level has been assigned to the Gaskiers glaciation (Gómez Peral et al, 2018;Poiré et al, 2018), dated at 580 Ma (Pu et al, 2016).…”

“…At the same time, significant climatic changes occurred affecting the atmosphere composition and the chemistry of the oceans (eg. Canfield et al, 2008;Ader et al, 2009Ader et al, , 2014Lyons et al, 2014;Sperling et al, 2015;Smith et al, 2016), which include a global glaciation (Gaskiers, Pu et al, 2016;Poiré et al, 2018) and the largest excursion recorded in carbon isotopic composition (Shuram excursion, Macdonald et al, 2013;Gómez Peral et al, 2018;Li et al, 2020). It has been speculated that all these processes have been directly related to global palaeogeographic changes due to the final dispersion of the Rodinia supercontinent and the formation of Gondwana (eg.…”