G'day Gondwana — the final accretion of a supercontinent: U–Pb ages from the post-orogenic São Vicente Granite, northern Paraguay Belt, Brazil

McGee, Ben; Collins, Alan S.; Trindade, R. I.

doi:10.1016/j.gr.2011.04.011

Cited by 63 publications

(29 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These findings also propose an Ediacaran-Early Cambrian closure of the Clymene Ocean. The age of 518 ± 4 Ma (U-Pb zircon) obtained for the post-tectonic São Vicente Granite (Almeida & Mantovani 1975;McGee et al 2012) establish the minimal age of the deformation and metamorphic phase in the northern part of Paraguay Belt and, therefore, the final time of the South America accretion in the Gondwana continent.…”

Section: The Amazonian Craton In Gondwanamentioning

confidence: 82%

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

View full text Add to dashboard Cite

In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

show abstract

Section: The Amazonian Craton In Gondwanamentioning

confidence: 82%

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

View full text Add to dashboard Cite

show abstract

“…These samples were prepared using the methods described in McGee et al (2012) at the University of Adelaide. U-Pb fractionation was corrected using the GEMOC GJ-1 zircon standard (thermal ionization mass spectrometry [TIMS] Jackson et al, 2004), and accuracy was checked using the recognized zircon standard Pleso vice with 206 Pb/ 238 U = 337.13 ± 0.37 Ma (Sláma et al, 2008).…”

Section: Zircon U-pb Laser-ablationmulticollector-inductively Coupledmentioning

confidence: 99%

Age and provenance of the Cryogenian to Cambrian passive margin to foreland basin sequence of the northern Paraguay Belt, Brazil

McGee

Collins

Trindade

et al. 2014

Geological Society of America Bulletin

Self Cite

View full text Add to dashboard Cite

The Paraguay Belt in central South America developed in response to the collision of the Amazonian craton, the São Francisco craton, and the Paranapanema block. The alleged "Brasiliano" age (ca. 620 Ma) of orogenesis has recently been questioned by paleo magnetic and radioisotopic ages that indicate the closing stages of orogenesis occurred well into the Cambrian. We investigated the timing of deposition and source areas for these sedimentary rocks overlying the Amazonian craton using integrated U-Pb and Hf isotope data of detrital zircons from within this sequence. In total, 742 detrital zircon U-Pb ages were analyzed from samples taken from the base to the top of this sedimentary succession. Maximum depositional ages from the uppermost part of this sequence of rocks, the Diamantino Formation, indicate that fi nal deposition began no earlier than 560 ± 13 Ma and possibly as young as the Cambrian. Given that zircon inheritance in these rocks continues up until this age and that known Amazonian craton ages are older than ca. 950 Ma, we considered other potential sources for these sediments. This was achieved by integrating the U-Pb detrital zircon data with Hf isotopic data from these zircons that have ε Hf values ranging from -18 to 12. The ε Hf signature is consistent, with a predominantly Amazonian source until the early Neoproterozoic, at which point the signal becomes signifi cantly more evolved. These data, when combined with other evidence discussed here, are consistent with an ocean to the east of the present-day Amazonian craton that did not close until the latest Ediacaran-Cambrian.

show abstract

“…Recentemente, este batólito intrusivo foi datado por McGee et al (2012), os quais obtiveram idade U-Pb em zircão de 518 ± 4 Ma. Tentativas mais específi-cas para determinação da idade deposicional do Grupo Alto Paraguai foram realizadas por Cordani et al (1978), datando os sedimentos argilosos da Formação Sepotuba pelo método Rb/Sr, adquirindo idades de 569 ± 20 Ma, interpretadas como idades deposicionais.…”

Section: Grupo Alto Paraguaiunclassified

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Santos

Júnior

Nogueira

et al. 2014

Geol. USP, Sér. cient.

View full text Add to dashboard Cite

Disponível on-line no endereço www.igc.usp.br/geologiausp -19 -Resumo Depósitos siliciclásticos da Formação Raizama de idade ediacarana-cambriana são expostos descontinuamente ao longo da margem sul do Cráton Amazônico e Faixa Paraguai Norte, centro-oeste do Brasil. Estes depósitos são interpretados por sucessões costeiras progradacionais, sobrepondo em conformidade os depósitos carbonáticos do Grupo Araras. A análise faciológica e estratigráfica da seção aflorante na região de Nobres, Estado do Mato Grosso, permitiu a individualização de dezessete fácies sedimentares agrupadas em cinco associações de fácies (AF): AF1) shoreface inferior consiste de arenitos com laminação plano -paralela e truncada por onda (microhummocky), intercalados por pelitos laminados, e com níveis bioturbados por tubos verticais perfurantes; AF2) shoreface superior, formada por arenitos com estratificação plano-paralela e cruzada swaley; AF3) submaré, composta por arenitos com estratificações cruzadas tangenciais e acanaladas com recobrimentos de siltito/arenito muito fino interpretados como depósitos de canal e barras; AF4) planície de maré é caracterizada por arenitos com estratificação cruzada tangencial e sigmoidal, laminação plano-paralela a cruzada de baixo ângulo, gretas de contração, intercalados por siltititos/arenito muito finos com acamamento flaser, organizados em ciclos de raseamento ascendente; e AF5) fluvial entrelaçado distal é constituída por arenitos com estratificação cruzada acanalada com lags lateralmente descontínuos, estratificações plano-paralelas e cruzadas de baixo-ângulo, parcialmente retrabalhadas por onda. A sedimentação da Formação Raizama indica que o fornecimento de sedimentos siliciclásticos estariam relacionado a soerguimentos no Cráton à noroeste da área estudada, sucedendo os depósitos carbonáticos do Grupo Araras. Traços fósseis tubulares descritos na AF1 indicam, pela primeira vez, a presença de traços fósseis perfurantes sugerindo uma idade deposicional para Formação Raizama mais próxima ao limite Ediacarano-Cambriano.Palavras-chave: Ediacarano-Cambriano; Cráton Amazônico; Faixa Paraguai; Formação Raizama; Depósitos costeiros. AbstractThe Ediacaran-Cambrian Raizama Formation presents siliciclastic deposits exposed discontinuously along of the southern margin of the Amazon Craton and the Northern Paraguay Belt, Central-Western Brazil. These deposits are interpreted as progradational coastal succession conformably overling the carbonate platform succession of the Upper Araras Group. The facies and stratigraphic analysis of outcrop section were carried out in the Nobres region, State of Mato Grosso, allowed the individualization of seventeen facies, grouped into five facies associations (FA): FA1) lower shoreface, consisting of sandstone with parallel and wave-truncated lamination (microhummocky) parted by laminated mudstones, locally bioturbed by Skolithos; FA2) upper shoreface, composed by parallel and swaley cross bedded sandstone; FA3) subtidal, represented by sandstones with tangential and through...

show abstract

G'day Gondwana — the final accretion of a supercontinent: U–Pb ages from the post-orogenic São Vicente Granite, northern Paraguay Belt, Brazil

Cited by 63 publications

References 44 publications

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

Age and provenance of the Cryogenian to Cambrian passive margin to foreland basin sequence of the northern Paraguay Belt, Brazil

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Contact Info

Product

Resources

About