Extensive oxidative weathering in the aftermath of a late Neoproterozoic glaciation – Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo Group) and Puga iron formations (Mato Grosso do Sul, Brazil)

Frei, Robert; Døssing, Lasse Nørbye; Gaucher, Claudio; Boggiani, Paulo César; Frei, K.M.; Árting, Trygvi Bech; Crowe, Sean A.; Freitas, Bernardo Tavares

doi:10.1016/j.gr.2017.05.003

Cited by 45 publications

(15 citation statements)

References 93 publications

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“…The youngest detrital zircon age dated in this study, of 690 ± 18 Ma, is similar to the younger detrital zircon ages found in the Puga (Babinski et al, 2013;McGee et al, 2018) and Santa Cruz (Frei et al, 2017) formations. This not only indicates the existence of an Early Cryogenian source for the Cryogenian successions of the South Paraguay Belt, but also defines a maximum depositional age for the Jacadigo Group.…”

Section: Detrital Zircon Provenancesupporting

confidence: 88%

Cryogenian glaciostatic and eustatic fluctuations and massive Marinoan-related deposition of Fe and Mn in the Urucum District, Brazil

Freitas

Rudnitzki

Morais

et al. 2021

Geology

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Global Neoproterozoic glaciations are related to extreme environmental changes and the reprise of iron formation in the rock record. However, the lack of narrow age constraints on Cryogenian successions bearing iron-formation deposits prevents correlation and understanding of these deposits on a global scale. Our new multiproxy data reveal a long Cryogenian record for the Jacadigo Group (Urucum District, Brazil) spanning the Sturtian and Marinoan ice ages. Deposition of the basal sequence of the Urucum Formation was influenced by Sturtian continental glaciation and was followed by a transgressive interglacial record of >600 m of carbonates that terminates in a glacioeustatic unconformity. Overlying this, there are up to 500 m of shale and sandstone interpreted as coeval to global Marinoan glacial advance. Glacial outwash delta deposits at the top of the formation correlate with diamictite-filled paleovalleys and are covered by massive Fe and Mn deposits of the Santa Cruz Formation and local carbonate. This second transgression is related to Marinoan deglaciation. Detrital zircon provenance supports glaciostatic control on Cryogenian sedimentary yield at the margins of the Amazon craton. These findings reveal the sedimentary response to two marked events of glacioeustatic incision and transgression, culminating in massive banded iron deposition during the Marinoan cryochron.

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Section: Detrital Zircon Provenancesupporting

confidence: 88%

Cryogenian glaciostatic and eustatic fluctuations and massive Marinoan-related deposition of Fe and Mn in the Urucum District, Brazil

Freitas

Rudnitzki

Morais

et al. 2021

Geology

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“…O' Connor and Walde (1986), however, alleged a much younger maximum depositional age of 623 ± 15 Ma for the Jacadigo Group based on K-Ar dating of acid volcanics of the Pimienta Formation, supposedly at the base of the Jacadigo equivalent (Boqui Group) in Bolivia, but unknown in Brazil; hence, the relevance of this date for Jacadigo sedimentation is conjectural (Angerer et al, 2016). The youngest detrital zircon in the Santa Cruz Formation suggests a maximum depositional age of 695 ± 17 Ma (U-Pb, Frei et al, 2017) for the upper part of the group. Consistent with this is a broadly permissive five-point Nd-Sm isochron age of 566 ± 110 Ma obtained by Viehmann et al (2016) for deposition of the iron formation.…”

Section: Journal Of Paleontology 93(4):612-627mentioning

confidence: 99%

“…These data thus set a minimum age for the VSM-bearing clasts at about 587 Ma but do not precisely constrain their maximum age. The stratigraphic relationship between the rudites containing the VSM-bearing clasts in the Urucum Formation and the iron formation in the overlying Santa Cruz Formation means that the carbonate that furnished the clasts must have been deposited and reworked no later than the glacial episode that influenced ferruginous sedimentation (Angerer et al, 2016;Frei et al, 2017). In light of the 587 Ma burial heating age of the Santa Cruz Formation (Piacentini et al, 2013), that episode was more likely related to the Cryogenian Sturtian or Marinoan events than to the 580-million-year-old Gaskiers glaciation.…”

Section: Journal Of Paleontology 93(4):612-627mentioning

confidence: 99%

“…This unit is overlain by a succession more than 300 m thick mostly of iron formation named the Santa Cruz Formation by Almeida (1945) and Banda Alta Formation by Dorr (1945) (see Morais et al, 2017, p. 395). Current thinking is that deposition of the iron formation occurred under the influence of late Neoproterozoic glacial conditions (Barbosa, 1949;Dorr, 1973;Urban et al, 1992;Angerer et al, 2016;Frei et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Insights into vase-shaped microfossil diversity and Neoproterozoic biostratigraphy in light of recent Brazilian discoveries

et al. 2019

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Vase-shaped microfossils (VSMs) occur in dolostone clasts within conglomerates, breccias, and diamictites of the Neoproterozoic Urucum Formation, Jacadigo Group, southwest Brazil. Although their taphonomic history is distinct from those of other VSM assemblages, morphometric comparison of Urucum fossils with five others described previously from North America and Europe show that two of the Urucum species—the long-necked Limeta lageniformis Morais, Fairchild, and Lahr in Morais et al., 2017 and the funnel-necked Palaeoamphora urucumense Morais et al., 2017—occur in the Kwagunt and Callison Lake assemblages, as does Pakupaku kabin Riedman, Porter, and Calver, 2017 recently described from the Togari Group, Tasmania. Obelix rootsii (Cohen, Irvine, and Strauss, 2017) new combination, previously known only from the Callison Lake Formation, is documented here from the Kwagunt Formation. In addition, Trigonocyrillium horodyskii (Bloeser, 1985) and Bonniea dacruchares Porter, Meisterfeld, and Knoll, 2003, first described from the Kwagunt assemblage, have now been found in the Urucum Formation. In light of this survey, 16 of the 18 validly described VSM species are now known to occur in the Kwagunt Formation and 13 in the Callison Lake Formation, with 12 of them shared by both formations. The fact that the Urucum VSM assemblage exhibits six of seven species in common with the Kwagunt Formation—L. lageniformis, P. urucumense, Cycliocyrillium simplex Porter, Meisterfeld, and Knoll, 2003, C. torquata Porter, Meisterfeld, and Knoll, 2003, B. dacruchares Porter, Meisterfeld, and Knoll, 2003, and T. horodyskii (Bloeser, 1985)—and all but the last of these in common with the Callison Lake Formation supports correlation of these three assemblages and indicates that the source of the fossiliferous clasts within the Urucum Formation may well have been a now-vanished late Tonian carbonate platform.UUID: http://zoobank.org/ac0becd6-29ff-4491-80fa-0291730fba65

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“…Recent work on South China and elsewhere (ref. 46 ) suggests fluctuating oxygenation states both on land and in the oceans after major glaciations. Our data build upon emerging evidence for the coupled links between bio-productivity levels, deposition of Mn and Fe-rich chemical sediments, and the oxygenation of Earth’s atmosphere during the Cryogenian interglacial period.…”

Section: Implications For Co-evolution Of Ocean Anoxia Bioproductivimentioning

confidence: 99%

Subtle Cr isotope signals track the variably anoxic Cryogenian interglacial period with voluminous manganese accumulation and decrease in biodiversity

Frank

Lehmann

et al. 2019

Sci Rep

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Earth’s atmosphere experienced a step of profound oxygenation during the Neoproterozoic era, accompanied by diversification of animals. However, during the Cryogenian period (720–635 million years ago) Earth experienced its most severe glaciations which likely impacted marine ecosystems and multicellular life in the oceans. In particular, large volumes of Mn and Fe accumulated during the interglacial intervals of the Cryogenian glaciations, indicating large anoxic marine metal reservoirs. Here we present chromium isotope-, rare earth element-, and redox-sensitive trace element data of sedimentary rocks from the interglacial Datangpo Formation deposited between the Sturtian and Marinoan glaciations in South China, in an attempt to investigate the oxidation state of the oceans and atmosphere. Both the Cr isotope and trace element data indicate mainly anoxic water conditions with cryptic oxic surface water incursions after the Sturtian glaciation. Glacial-fed manganese precipitated as manganese carbonate in anoxic basins, and the non-fractionated δ53Cr record of −0.10 ± 0.06‰ identifies anoxic conditions with a cryptic component of slightly fractionated Cr isotope composition in manganese ore, in line with distinctly fractionated Mo isotope composition. Both the manganese carbonate ore and the black shales exhibit very low redox-sensitive element concentrations. Our study demonstrates that the oxygenation of the seawater, and inferably of the atmosphere, at the beginning of the Cryogenian interglacial interval was much subdued. The post-glacial rebound then allowed the Ediacaran biological diversity.

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Extensive oxidative weathering in the aftermath of a late Neoproterozoic glaciation – Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo Group) and Puga iron formations (Mato Grosso do Sul, Brazil)

Cited by 45 publications

References 93 publications

Cryogenian glaciostatic and eustatic fluctuations and massive Marinoan-related deposition of Fe and Mn in the Urucum District, Brazil

Cryogenian glaciostatic and eustatic fluctuations and massive Marinoan-related deposition of Fe and Mn in the Urucum District, Brazil

Insights into vase-shaped microfossil diversity and Neoproterozoic biostratigraphy in light of recent Brazilian discoveries

Subtle Cr isotope signals track the variably anoxic Cryogenian interglacial period with voluminous manganese accumulation and decrease in biodiversity

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