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| | Report (article/chapter) | | Jacadigo Group, and associated carbonates of the Araras and Corumbá groups,
Paraguay Belt, Brazil
Carlos...Jacadigo Group, and associated carbonates of the Araras
and Corumbá groups, Paraguay Belt, Brazil
CARLOS...and Guaicurus formations) in the south and the Araras Group (Mirassol d’Oeste, Guia, Nobres formations)...hills south of the town
of Corumbá extending into Bolivia. The Urucum Fm. (lower
unit) is characterized by...is restricted to
a few hills on the border of Bolivia and Brazil near Corumbá
(Fig. 45.1).
There are | 👁 Image
| | Journal (article/letter/editorial) | | recent work has proceeded by SHRIMP analysis of zircon,
coupled with whole rock Sm–Nd data (Rapela et...were monitored with reference to Sri Lankan gem
zircon standard BR266, with an age of 559.1 Ma, and Pb/U...of 524 ± 4 Ma was from SHRIMP
analyses of 16/17 zircon grains, marginally younger than the intercept
age...quartz, and plagioclase, ± muscovite and opaques). Zircon
from sample 703 yielded an age of 533 ± 12 Ma,...overprinting by the late Paleozoic deformation.
Zircon analysed by SHRIMP from sample SdV707 yields a | 👁 Image
| Bandeira, José, McGee, Ben, Nogueira, Afonso C.R., Collins, Alan S., Trindade, Ricardo (2012) Sedimentological and provenance response to Cambrian closure of the Clymene ocean: The upper Alto Paraguai Group, Paraguay belt, Brazil. Gondwana Research, 21 (2) 323-340 doi:10.1016/j.gr.2011.04.006 | Journal (article/letter/editorial) | | Neoproterozoic source regions were confirmed by zircon grains that yielded ages around 600 to
540 Ma,...recorded in the
Ediacaran carbonates rocks of the Araras Group (Nogueira et al., 2003,
2007; Alvarenga et...inductively-coupled-plasma mass-spectrometry (LA-ICPMS)
study of zircon grains from the uppermost levels of the Group....Halverson and Hurtgen, 2007).
Carbonate rocks of the Araras Group sharply overlie the Puga Formation
diamictites...Hoffman and Schrag, 2002; Nogueira et al., 2003). The
Araras Group is divided into four formations, and from | 👁 Image
| Romero, John Alexander Sandoval, Lafon, Jean Michel, Nogueira, Afonso Cesar Rodrigues, Soares, Joelson Lima (2013) Sr isotope geochemistry and Pb–Pb geochronology of the Neoproterozoic cap carbonates, Tangará da Serra, Brazil. International Geology Review, 55 (2) 185-203 doi:10.1080/00206814.2012.692517 | Journal (article/letter/editorial) | | represent the cap
carbonates of the Neoproterozoic Araras Group, located along the southern border of Amazonian...further evidence that the cap carbonates of the Araras
Group are related to the Marinoan glaciation, which...around 0.7071–0.7073 of the cap carbonates of the Araras Group is compatible with Sr marine evolution
curves...Neoproterozoic platform carbonate deposits of Bambui
and Araras Groups, in the São Francisco and Amazonian
Cratons...the Neoproterozoic
glacial formations, providing zircon ages of interbedded
Downloaded by [University | 👁 Image
| | Journal (article/letter/editorial) | | Puga Formation, (3) a carbonate succession in the Araras Group, and (4) an upper succession
composed of...Formation
Lithology
Upper
Alto Paraguay
Carbonate
Araras
Diamantino
Raizama
Nobres
Guia
Mirassol d’Oeste...(Cuiabá Group and Puga Formation),
carbonates (Araras Group), and epiclastic sedimentary rocks (Alto...flows and iceberg
melting.
The overlying carbonate Araras Group marks the end of glaciation. The 1300 m thick...carbonates of the
Corumbá Group in the south and the Araras Group in the north.
These groups occur in different | 👁 Image
| | Journal (article/letter/editorial) | | Paraguay Belt in Brazil and its correlative in Bolivia, the Tucavaca
Belt, which probably correspond to...Cuiab~i Group. Overlying this
glaciogenic unit is the Araras Formation, a carbonatic sequence which marks the...deposition of
these rocks. The two basal units (Puga and Araras
formations) can be traced for long distances along...(E) = Pimentel et al. (1991). Methods: (1) = U-Pb zircon; (2) = U-Pb-titanite; (3) = whole-rock Rb--Sr isochron;...destruction of residual mineral phases such as zircon,
monazite, sphene and apatite, increasing the HFSE | 👁 Image
| | Journal (article/letter/editorial) | | orthogneisses of the Alto Moxotó Terrain (U–Pb zircon ages
between 2.01 and 2.23 Ga; [21,22]), a basement...stable twopolarity component identified in the Araras Group basal
dolomites of Amazonia (pole Am1, [18...across
correlative units at the Tucavaca belt in Bolivia at the
southern margin of the Amazon Craton [60]...de las Animas 1
Amazonia (SA)
Am1
Am2
Araras Group A
Araras Group B
Laurentia (LA)
L1
L2
Skinner Cove...Cove pole [49,51] dated at
550.5+ 3/− 2 Ma (U–Pb zircon; [61]).
After separation from Laurentia, Amazonia | 👁 Image
| ROSA, M, CONCEICAO, H, MACAMBIRA, M, GALARZA, M, CUNHA, M, MENEZES, R, MARINHO, M, FILHO, B, RIOS, D (2007) Neoproterozoic anorogenic magmatism in the Southern Bahia Alkaline Province of NE Brazil: U–Pb and Pb–Pb ages of the blue sodalite syenites. Lithos, 97 (1) 88-97 doi:10.1016/j.lithos.2006.12.011 | Journal (article/letter/editorial) | | Rio Pardo (714 ± 8) and Pb–Pb evaporation ages of zircon
from Floresta Azul (696 ± 3 Ma) and Itarantim (722...Province,
Afganistan (Cook, 2004), Cerro Sapo, Bolivia (Schultz
et al., 2004) and Swartbooisdrif, Namibia...contains the Itabuna, Floresta Azul, Serra das
Araras and Itarantim batholiths, a large number of
stocks...by and in sharp contact with nepheline
syenite. Zircon crystals up to 3 cm long are found in this
facies...gneiss–migmatite, quartz syenites of the Serra das Araras syenite
massif, and gabbros of the Rio Pardo gabbro–anorthosite | 👁 Image
| | Journal (article/letter/editorial) | | thick succession
of platformal carbonate rocks (Araras Formation), which directly overlie Marinoan glacial...samples across three different sections of the Araras Formation.
␦13 CPDB values of the carbonate from...arenaceous dolostone of the upper parts of the Araras Formation have high ␦13 CPDB values (+4.1 to
+9...hand, the ␦13 CPDB profile observed across the Araras Formation exhibits an approximately 200 m
thick...carbonates with low ␦13 CPDB values.
Carbonates of the Araras Formation have 87 Sr/86 Sr ratios ranging from | 👁 Image
| de Alvarenga, Carlos J.S., Dardenne, Marcel A., Santos, Roberto V., Brod, Emanuele R., Gioia, Simone M.C.L., Sial, Alcides N., Dantas, Elton L., Ferreira, Valderez P. (2008) Isotope stratigraphy of Neoproterozoic cap carbonates in the Araras Group, Brazil. Gondwana Research, 13 (4) 469-479 doi:10.1016/j.gr.2007.05.004 | Journal (article/letter/editorial) | | stratigraphy of Neoproterozoic cap carbonates in the
Araras Group, Brazil
Carlos J.S. de Alvarenga a,⁎, Marcel...Neoproterozoic; Chemostratigraphy; Carbonate platform; Araras group; Glaciation
1. Introduction
Associations...Sr isotope data from the
lower formations of the Araras Group (cap dolomite and Guia
Formation) and contribute...sedimentation at low latitudes (Trindade et al., 2003).
The Araras Group (carbonate sequence) on the southeastern...siltstone above post-Marinoan carbonates of the
Araras Group (Fig. 2), and represents the record of a | 👁 Image
| | Journal (article/letter/editorial) | | homepage: www.elsevier.com/locate/gr
Detrital zircon ages and geochronological constraints on the Neoproterozoic...we present the first U–Pb SHRIMP ages on detrital zircon grains separated
from the matrix of six samples...provenance from the
adjacent Rio Apa Block. The youngest zircon was dated at 706 ± 9 Ma, thus constraining the...Formation, covered by a thick carbonate succession, Araras
Group in the north and Corumbá Group in the south...westwards
from Corumbá in western Brazil, into Bolivia as a large syncline
known as the Tucavaca Belt | 👁 Image
| Silva-Tamayo, J.C., Nägler, T.F., Sial, A.N., Nogueira, A., Kyser, K., Riccomini, C., James, N.P., Narbonne, G.M., Villa, I.M. (2010) Global perturbation of the marine Ca isotopic composition in the aftermath of the Marinoan global glaciation. Precambrian Research, 182 (4) 373-381 doi:10.1016/j.precamres.2010.06.015 | Journal (article/letter/editorial) | | Serra locality. (B) General stratigraphy of the Araras Group and associated units, after Nogueira et al...(GF) Formations belong
to the late Neoproterozoic Araras Group, Mato Grosso, Central-W
Brazil (Fig. 1A and...(Babinski et al., 2006) and the 706 Ma detrital zircon
U–Pb SHRIMP ages (uncertainties not reported) obtained...assemblages also support a post-Marinoan age for the
Araras Group carbonates (Gaucher et al., 2003).
For the...a much longer time frame than that indicated by zircon dating.
Condon et al. (2005) report that the total | 👁 Image
| | Journal (article/letter/editorial) | | Keywords:
Gondwana assembly
São Vicente
LA-ICPMS
Zircon
Paraguay Belt
a b s t r a c t
The Paraguay Belt...NP3cu5 - Cuiabá Subunit 5 - phyllite
NP3ars - Araras - Dolomite
NP3cu6 - Cuiabá Subunit 6 - phyllite...Ablation Inductively Coupled Plasma
Mass Spectrometry) zircon ages from the post-orogenic São Vicente in
order...diamictites of the Puga Group, carbonates
of the Araras Group and siliciclastics of the upper Alto Paraguay...plagioclase, quartz and biotite, with apatite,
zircon, magnetite, pyrite, allanite and flourite as accessory | 👁 Image
| | Report (article/chapter) | | Puncoviscana Basin extends between 238S
(Tarija, Bolivia) and 278S (Tucumán, Argentina)
along the Eastern...found in the Corumbá Basin (Chiquitanas area, Bolivia) prove the existence of an
active Neoproterozoic...and
stylolites were found within fractures of the Araras
Formation (Paraguay Belt) in the area of Matto...Mantiqueira Province and its African
connections: a zircon-based U–Pb geochronologic
subdivision for the ...Aspectos
Geológicos-enonómicos da Formação Araras do
Grupo Alto Paraguai-MT. In: XXX Congreso Brasileiro | 👁 Image
| | Book | | supercontinental cycle. On the basis
of U-Pb detrital zircon ages found in major river mouths in four continents...cap dolostone, but even the highest resolution
zircon U-Pb ages are unlikely to resolve the difference...Constraints
2.4.1. Glacially influenced sequence
2.4.2. Araras Group
2.4.3. Serra Azul Formation
2.4.4. Alto Paraguay...southern Paraguay Belt extends from Corumbá into Bolivia as a large syncline
known as the Tucavaca Belt...40°
60°
Paraná
Basin
Cuiabá
Cáceres
Brazil
Bolivia
Be
lt
40°
8°
No
rth
80°
16°S
Amazonian Craton | 👁 Image
| Conceicao, H.; de Lourdes da Silva Rosa, M.; Moura, C. A.V.; Macambira, M. J. B.; Galarza, M. A.; Rios, D. C.; Marinho, M. M.; Menezes, R. C. L.; Cunha, M. P. (2009) Petrology of the Neoproterozoic Itarantim nepheline syenite batholith, São Francisco Craton, Bahia, Brazil. The Canadian Mineralogist, 47 (6). 1527-1550 doi:10.3749/canmin.47.6.1527 | Journal (article/letter/editorial) | | Bahia
Alkaline Province, in Brazil. It has a Pb–Pb zircon age of 721 ± 3 Ma, and consists of the Serra do...du sud de Bahia, au Brésil. Il a un âge Pb–Pb (zircon) de 721 ± 3 Ma, et comprend deux faciès, les syénites...batholiths (e.g., Itabuna, Floresta Azul, Serra
das Araras en Itarantim), a large number of stocks (e.g.,...al. (1977). In addition, U–Pb
and Pb–Pb ages for zircon presented by Teixeira et al.
(1997) and Rosa et...SE). Nepheline syenite pegmatites
usually contain zircon crystals up to 3 cm across (Fig.
4B). Country-rock | 👁 Image
| | Report (article/chapter) | | (2004)
Remagnetized poles
24
Bambui + Salitre C
25
Araras Group B
26
Bambui B
Remagnetized palaeomagnetic...assemblage of Western Gondwana
The Guia Formation
The Araras Group in the SE Amazon Craton
(Fig. 1a) presents...well-preserved outcrops of the lower part
of the Araras Group in the Terconi Quarry. Here,
basal pink microbial...column of the Mirassol d’Oeste and Guia formations (Araras Group) showing primary
(with geomagnetic reversals;...Craton and the
proto-Gondwana at the time of the Araras Group
remagnetization and the intrusion of the | 👁 Image
| Misi, Aroldo, Kaufman, Alan J., Veizer, Jàn, Powis, Kelli, Azmy, Karem, Boggiani, Paulo Cesar, Gaucher, Claudio, Teixeira, João Batista G., Sanches, Andreia L., Iyer, Sundaram S.S. (2007) Chemostratigraphic correlation of Neoproterozoic successions in South America. Chemical Geology, 237 (1) 143-167 doi:10.1016/j.chemgeo.2006.06.019 | Journal (article/letter/editorial) | | Itapucumi,
Tucuvaca, Jacadigo, Boqui, and Araras groups
and Araras and Puga Formations and (3) the Rio
de...is in the lowermost section of
the Corumbá and Araras groups (de Alvarenga and
Trompette, 1992). In South...occur in the Corumbá Group
(Corumbá Basin), the Araras Group and the Arroyo del
Soldado Group in Uruguay...Arroyo del Soldado (Lower
Polanco Fm.), Cuiabá (Araras Gr.), Vazante, Bambuí and Una Groups. (d) Least...Leather, J., Allen, P.A.,
Shields, G., 2000. New U–Pb zircon dates for the Neoproterozoic
Gubrah glaciation | 👁 Image
| | Journal (article/letter/editorial) | | age of the Iporanga Formation with SHRIMP U-Pb zircon: implications for possible Ediacaran
glaciation...stratigraphy of Neoproterozoic cap carbonates in the Araras Group, Brazil
C.J.S. de Alvarenga, M.A. Dardenne...Ribeira belt based on laser-ablation ICPMS207Pb/206Pb zircon ages
C.S. Valladares, N. Machado, M. Heilbron, | 👁 Image
| Caxito, Fabrício de Andrade, Halverson, Galen P., Uhlein, Alexandre, Stevenson, Ross, Gonçalves Dias, Tatiana, Uhlein, Gabriel J. (2012) Marinoan glaciation in east central Brazil. Precambrian Research, 200. 38-58 doi:10.1016/j.precamres.2012.01.005 | Journal (article/letter/editorial) | | available lithostratigraphic, isotopic and U-Pb zircon data, we propose that the Sete
Lagoas Formation...et al., 2007; Tuller et al., 2009). The detrital zircon U-Pb age spectra of the Carrancas Formation is...no cap carbonate sequence. The younger detrital zircon U-Pb age
populations of most of these units yielded...the southwestern margin
of the Amazon craton, the Araras Group also displays a upwards
increasing ␦13 C...Lagoas Formation. Furthermore, the base of the Araras
Group is a dolostone (the 20–32 m Mirassol D’oeste | 👁 Image
| | Journal (article/letter/editorial) | | Belt based on laser-ablation ICPMS 207Pb/206Pb zircon
ages” C. Valladares, N. Machado, M. Heilbron, B...(Paleoproterozoic)
and 517 Ma (Cambrian) for detrital zircon grains from
paragneisses in the central Ribeira...Brasiliano metamorphism in Proterozoic-Archean
zircon grains, although the possibility of a Mesoproterozoic...stratigraphy of Neoproterozoic cap
carbonates in the Araras Group, Brazil”. The cap dolomite and
limestones | 👁 Image
| FONT, E, NEDELEC, A, TRINDADE, R, MACOUIN, M, CHARRIERE, A (2006) Chemostratigraphy of the Neoproterozoic Mirassol d'Oeste cap dolostones (Mato Grosso, Brazil): An alternative model for Marinoan cap dolostone formation. Earth and Planetary Science Letters, 250 (1) 89-103 doi:10.1016/j.epsl.2006.06.047 | Journal (article/letter/editorial) | | [22].
been precisely dated at 635 ± 1,2 Ma (U–Pb zircon
method; [13]), consistent with a recent Pb–Pb age...studies address in detail the basal dolostones of the
Araras Group. Instead, they are regional studies, dealing...provided a convenient deposition setting
for the whole Araras Group.
Anoxic to suboxic conditions at deposition...paleoceanographic changes in the late Neoproterozoic Araras
carbonate platform, southern Amazon craton, Brazil...Hoffmann, D. Condon, S. Bowring, J. Crowley, A U–Pb zircon
date from the Neoproterozoic Ghaub Formation, Namibia: | 👁 Image
| | Journal (article/letter/editorial) | | Paraguay belt. 1177 LA-ICPMS and 61
SHRIMP detrital zircon U-Pb ages were analysed from samples taken from...11 Ma in the southern Paraguay
Belt. Given that zircon inheritance in these rocks continues up until this...these sediments by integrating the U-Pb detrital
zircon data with Hf isotopic data. Cumulative proportion...Keywords
U-Pb geochronology (LA-ICPMS, SHRIMP); zircon; provenance; Paraguay
Belt; Gondwana
2
Introduction...systems (Spencer et al., 2013). Highly resistant zircon crystals
contain elevated proportions of trace | 👁 Image
| | Report (article/chapter) | | Urucum District of
southwestern Brazil and eastern Bolivia (see below) were tentatively assigned to the terminal...Urucum District
of southwestern Brazil and adjacent Bolivia (Dorr 1945; Walde
et al. 1981; Urban et al. 1992;...dolostone in
South China yields a 238U – 206Pb (IDTIMS) zircon date of
635.2 + 0.4 Ma (Condon et al. 2005). A...statistically indistinguishable 238U – 206Pb (SHRIMP) zircon date of 636.3 + 4.9 Ma
was obtained from a tuff...has an indistinguishable
238
U – 206Pb (IDTIMS) zircon date of 635.6 + 0.5 Ma (Hoffmann
et al. 2004). | 👁 Image
| | Journal (article/letter/editorial) | | Paraguay Belt, another carbonate unit
known as Araras Group overlies the Puga Formation (Nogueira et...regarding those of the North. The stratigraphy
of the Araras Group is significantly different (Alvarenga et al...ash beds in the Tamengo Formation yielded a U–Pb zircon
Please cite this article as: Spangenberg, J.E...Formation, just above the Bocaina Formation. U-Pb zircon dating of volcanic
zircons from the upper Tamengo...stratigraphy of Neoproterozoic cap carbonates in the Araras Group, Brazil. Gondwana Research 13, 469–479.
Alvarenga |
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