Sedimentological and stratigraphic constraints on depositional environment for Ediacaran carbonate rocks of the São Francisco Craton: Implications for phosphogenesis and paleoecology

Sanders, Cecilia B.; Grotzinger, J. P.

doi:10.1016/j.precamres.2021.106328

Cited by 12 publications

(12 citation statements)

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“…They are formed through the combination of binding and trapping of carbonate sediment and microbially influenced carbonate precipitation–cementation in microbial mats, providing the mechanical substrate for the growth of each successive bioconstruction layer (cf. Sami & James, 1996; Feldmann & McKenzie, 1998; Bosak et al ., 2013b; Sanders & Grotzinger, 2021). Unlike low energy, near‐shore, supratidal–intertidal stromatolite buildups (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…In this sense, the occurrence of the ore-grade phosphatic rich sediments in the reef rim system of facies association 3 seems to be an exclusive feature of the Bocaina Formation, because other Precambrian microbialite hosted phosphorite occurrences are described in foreshore/shoreline tidal flats (Banerjee, 1971;Banerjee et al, 1986;Drummond et al, 2015;Sallstedt et al, 2018) or mid platform intertidalsubtidal settings (Misi & Kyle, 1994;Shiraishi et al, 2019;Sanders & Grotzinger, 2021).…”

Section: Rimmed Platformmentioning

confidence: 99%

“…Precambrian phosphate deposits are also often associated with phosphatic microbialites, commonly deposited in shoreline, peritidal settings (Banerjee, 1971; Banerjee et al ., 1986; Hiatt et al ., 2015; Sallstedt et al ., 2018). Neoproterozoic phosphatic microbialites, however, seem to hold a complex development associated with the colonization of high‐energy patch reefs on intertidal–subtidal settings, featuring close association with the deposition of autochthonous reworked granular sediments (this work; Zhang et al ., 2019; Sanders & Grotzinger, 2021). Phosphate mineralization in those settings is controlled by microbially mediated organic matter consumption, regulated by the nucleation of redox gradients within microbial buildups (Banerjee, 1971; Banerjee et al ., 1986; Caird et al ., 2017; Sanders & Grotzinger, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Neoproterozoic phosphatic microbialites, however, seem to hold a complex development associated with the colonization of high‐energy patch reefs on intertidal–subtidal settings, featuring close association with the deposition of autochthonous reworked granular sediments (this work; Zhang et al ., 2019; Sanders & Grotzinger, 2021). Phosphate mineralization in those settings is controlled by microbially mediated organic matter consumption, regulated by the nucleation of redox gradients within microbial buildups (Banerjee, 1971; Banerjee et al ., 1986; Caird et al ., 2017; Sanders & Grotzinger, 2021). In this scenario, the deposition of closely associated phosphatic and non‐phosphatic microbialite mounds in Ediacaran successions (cf.…”

Section: Introductionmentioning

confidence: 99%

“…In this scenario, the deposition of closely associated phosphatic and non‐phosphatic microbialite mounds in Ediacaran successions (cf. Sanders & Grotzinger, 2021) seems to indicate that the nucleation of favourable phosphatization conditions is solely dictated by stromatolite growth patterns (for example, intra‐columnar connectivity, bioconstruction morphology and degree of intra‐laminae cementation), challenging the role of (allogenic) regional physiographic and oceanographic controls on phosphate mineralization processes (see Drummond et al ., 2015; Caird et al ., 2017, for comparison).…”

Section: Introductionmentioning

confidence: 99%

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Sedimentary evolution and sequence stratigraphy of Ediacaran high‐grade phosphorite–dolomite–shale successions of the Bocaina Formation (Corumbá Group), Central Brazil: Implications for the Neoproterozoic phosphogenic event

et al. 2023

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Extensive phosphorite deposition is observed in the Neoproterozoic after a prolonged hiatus during most of the Mesoproterozoic era. This event is thought to represent an important record of major palaeoenvironmental, palaeoceanographic and biotic changes that shaped Neoproterozoic ecosystems, suggesting close relationships between phosphogenesis and the preservation of key Ediacaran biotas. However, high‐grade Ediacaran phosphorite deposits are relatively uncommon, diminishing the opportunity to test current phosphate mineralization–deposition models and their implications for Neoproterozoic research. In this scenario, widespread Ediacaran phosphorite–dolomite–shale successions of the Bocaina Formation (Corumbá Group – Central Brazil) are poorly explored in international literature. Nevertheless, recent advances in phosphate exploration gave access to continuous drill core sections and freshly opened mine pits, revealing an unprecedented record of complex phosphatic successions featuring the occurrence of Ediacaran microfossils assigned to the Doushantuo–Pertatataka assemblages. This work seeks to constrain main lithofacies, sequence stratigraphy and depositional settings from these phosphatic successions in order to analyse the sedimentary evolution of the unit under the current Neoproterozoic phosphorite research framework. These results indicate that the Bocaina Formation records secular sustained phosphate deposition. These deposits are related to unprecedented, microbialite reef rim phosphorites deposited during a lower accretionary rimmed platform stage, followed by the deposition of Doushantuo‐like, whole platform phosphorites associated with a later, drowned platform stage, therefore, reinforcing the evidence for the operation of strong allogeneic controls on phosphate mineralization–concentration. In addition, this study concludes that fossiliferous Ediacaran phosphatic deposits such as the Bocaina Formation are important to understanding Neoproterozoic phosphogenic events, because they may record the transition from a Precambrian to Phanerozoic‐like phosphogenesis associated with the instauration of the Ediacaran–Cambrian phosphatic taphonomic window. This evidence hints that the growing dataset from the Bocaina Formation may bring new, exciting perspectives for Neoproterozoic research as a whole.

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Section: Discussionmentioning

confidence: 99%