C- and Sr-isotope systematics applied to Neoproterozoic marbles of the Seridó belt, northeastern Brazil

Nascimento, Rielva Solimairy Campelo do; Sial, Alcídes N.; Pimentel, Márcio Martins

doi:10.1016/j.chemgeo.2006.06.017

Cited by 18 publications

(24 citation statements)

References 29 publications

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“…Marble layers associated with BIF at the Riacho Fundo locality display positive δ 13 C values within the 7 -9‰ interval, a range similar to that observed in a marble layer of the the Jucurutu Formation, at the town of Jucurutu, reported by Nascimento et al (2007).…”

mentioning

confidence: 49%

“…Apart from these few samples, δ 13 C values probably represent near-primary isotope signals. Nascimento et al (2004Nascimento et al ( , 2007 found no co-variation between δ 13 C and Mn/Sr ratios or between δ 13 C and δ 18 O for carbonates of the Jucurutu Formation, supporting the primary nature of isotopic signals.…”

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 97%

“…In the Jucurutu Formation, metric to decametric-scale marble layers, sometimes compositionally banded, are abundant and occur at three stratigraphic levels, one of which is near the base of the succession (Jardim de Sá 1994; Nascimento et al 2007). In the Seridó Formation, marble layers are less abundant and are only found near the base of this formation (extensional tectonic stage).…”

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 99%

“…amphibolite facies), as is the case throughout most of the Seridó Belt, the interpretation of depositional patterns of sedimentation, as well as C-and Sr-isotope variations, can be severely compromised. In a preliminary attempt to estimate the age of deposition of carbonate rocks of the Seridó Group (Jucurutu and Seridó formations) using C-and Sr-isotope chemostratigraphy, Nascimento et al (2004Nascimento et al ( , 2007 have examined nine marble layers and proposed a depositional age around 600 Ma.…”

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 99%

“…Kaufman et al 1997;Kennedy et al 1998;Calver et al 2004;Allen & Etienne 2008). In the last three decades, the number of studies relying on isotope chemostratigraphy has grown substantially and, in the case of C-isotope stratigraphy, has been applied to metamorphic rocks up to the high grade (Melezhik et al 2005;Nascimento et al 2007;Chiglino et al 2010;Sial et al 2015a) and may retain depositional δ…”

Section: Introductionmentioning

confidence: 99%

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Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Sial

Gaucher²,

Misi

et al. 2016

Braz. J. Geol.

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This report reviews and incorporates new elemental and isotope chemostratigraphic data for correlation of Neoproterozoic carbonate-dominated successions in South America (Argentina, Bolivia, Brazil, Paraguay and Uruguay). These thick mixed carbonate/siliciclastic successions were largely deposited in epicontinental basins or accumulated on passive margins on the edges of cratons (e.g. São Francisco, Amazonia, Rio Apa Block, Pampia and Río de la Plata paleocontinents) during extensional events related to the rifting of the Rodinia Supercontinent. From the stratigraphic point of view, these successions occur as three mega-sequences: glaciogenic, marine carbonate platform (above glaciomarine diamictites or rift successions), and dominantly continental to transitional siliciclastics. In the orogenic belts surrounding cratons, carbonate-dominated successions with important volcanoclastic/siliciclastic contribution have been, in most cases, strongly deformed. The precise ages of these successions remain a matter of debate, but recently new paleontological and geochronological data have considerably constrained depositional intervals. Here, we report high-resolution C, O, Sr, and S isotope trends measured in well-preserved sample sets and mainly use Sr and C isotopes RESUMO: Esta revisão incorpora novos dados isotópicos e quími-cos para correlação quimioestratigráfica de sucessões

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mentioning

confidence: 49%

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 97%

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 99%

Section: Seridó Belt: Jucurutu and Seridó Formationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Sial

Gaucher²,

Misi

et al. 2016

Braz. J. Geol.

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Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Madugalla

Pitawala

2021

Geological Journal

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Proterozoic high‐grade marbles cover a significant portion of the Highland Complex (HC) of Sri Lanka. Although many studies on metamorphic silicate rocks of the country have been carried out, marbles, which can be used as a tool to interpret the evolution history of the crust, has been paid little attention. The present study aims to understand the genesis and characteristics of protolith of these marbles by investigating their mineralogy and geochemistry. The studied marbles occur as bands intercalated with pelitic gneisses and quartzites of the HC, indicating the pre‐existing sandstone‐shale‐carbonate sedimentary sequence. Except along the lithological contacts, the studied marbles contain low amounts of silicate minerals (<5%) and are dominated by dolomites (>90%) with minor calcites. Calcites occur as inclusions within dolomites or as fine grains along the grain boundaries of dolomites. Silicate minerals always occur as lensoid or layered aggregations. Dolomites are related to the protolith composition, while most of the calcites are metamorphic products formed due to the reaction of silicate minerals with dolomite. Silicate mineralogical zones suggest the inherited compositional variations of the protolith. Although the marbles have undergone granulite‐grade metamorphism, their trace elemental contents have been well preserved. Concentrations of Fe, Mn, Sr, Na, and K as well as rare earth element (REE) contents of the marbles are comparable to those of marine origin carbonates. Hence, marine dolostone can be proposed as the protolith for Sri Lankan marbles. The distinct mineralogy as well as elevated trace element and REE concentrations of marble in the lithological contact zones are evidenced for prevailed syn‐ to post‐metamorphic fluid activities in the HC. Mineralogical and trace elemental composition of Sri Lankan marbles are correlated well with the marbles from other East‐Gondwanaland crustal units.

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Unraveling the evolution of the Bodó W-skarn district in the Seridó Mineral Province (NE-Brazil): constraints from C-O stable isotopes, thermodynamic modeling, and geochronology

Lucas,

Hollanda,

de Souza Neto

et al. 2024

Miner Deposita

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C- and Sr-isotope systematics applied to Neoproterozoic marbles of the Seridó belt, northeastern Brazil

Cited by 18 publications

References 29 publications

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Mineralogical and geochemical constraints on the provenance and depositional setting of Sri Lankan marbles

Unraveling the evolution of the Bodó W-skarn district in the Seridó Mineral Province (NE-Brazil): constraints from C-O stable isotopes, thermodynamic modeling, and geochronology

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