Os granitóides brasilianos da faixa de dobramentos Paraguai, MS e MT

Godoy, Antônio Misson; Ruiz, Amarildo Salina; Manzano, Jefferson Cassu; Araújo-Ruiz, Larissa Marques Barbosa de

doi:10.5327/z1519-874x2007000100003

Cited by 14 publications

(24 citation statements)

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“…Woldemichael (2003) modeled this interaction as a subduction zone from 550 to 520 Ma of the Rio Apa oceanic crust under the Paranapanema, with the development of an Andean type magmatic arc. A subsequent investigation of the geochemistry of the granitic bodies that outcrop at the western margin of the Paraná Basin showed that these rocks are potassic to high-K, calc-alkaline, peraluminous to metaluminous, type-I granitoids that plot in the syncollisional fi eld of the tectonic classifi cation diagrams (Godoy et al, 2007). Early work constraining the ages of these intrusives includes a ca.…”

Section: Tectonic Model and The Paraguay Belt Within South America Anmentioning

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

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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.

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Section: Tectonic Model and The Paraguay Belt Within South America Anmentioning

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

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“…A Província Granitóide Matogrossense é constituída por sete corpos ígneos intrusivos em rochas epimetamórficas do Grupo Cuiabá e, pelas suas características genéticas e evolutivas, foram reunidas em dois grandes grupos e/ou eventos magmáticos denominados de suítes magmáticas sul e norte (Godoy et al 2004(Godoy et al , 2007 e Manzano (2009).…”

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“…Nas proximidades do contato com os corpos magmáti-cos observam-se paragêneses de metamorfismo de contato nas fácies albita a hornblenda hornfels (Godoy et al 2007). As evidências de metamorfismo de contato nestas rochas encontram-se parcialmente preservadas, quando não há superposição das deformações miloní-ticas, que impõem novas feições estruturais e retrometamórficas ou quando não se encontram parcialmente recobertas pelas unidades recentes.…”

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“…O principal objetivo deste trabalho é a apresentação e interpretação dos dados isotópicos obtidos por Manzano (2009) e por Pinho et al (inédito) e para estas discussões, encontram-se referenciados os dados isotó-picos parciais de Ferreira et al (2007de Ferreira et al ( , 2008, além de uma breve caracterização geológica e estrutural (Godoy et al 2007) e geoquímica Godoy et al (2005aGodoy et al ( , 2005bGodoy et al ( e 2007 e Manzano et al (2007b) de vital importância à compreensão destas associações magmáticas.…”

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“…GEOLOGIA LOCAL Na descrição dos corpos magmáticos serão mantidos, os nomes inicialmente definidos, bem como a proposta genética e geocronológica de subdivisão da província segundo Godoy et al (2005aGodoy et al ( , 2005bGodoy et al ( , 2007. Na figura 2 é apresentado o mapa geológi-co com a localização dos corpos magmáticos estudados.…”

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Estudos isotópicos das rochas granitóides neoproterozóicas da Faixa de Dobramento Paraguai

Godoy

Pinho²,

Manzano

et al. 2010

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Resumo A Província Granitóide Neoproterozóica do sudeste matogrossense está relacionada à evolução da Faixa de Dobramento Paraguai no limite sudeste do Cráton Amazônico e é constituída por sete corpos ígneos distintos em dois eventos magmáticos intrusivos em rochas epimetamórficas do Grupo Cuiabá. O evento magmático do sul aflora no Estado de Mato Grosso do Sul na forma de intrusões fissurais, alongadas e alinhadas na direção NNE-SSW. As idades modelo T DM obtidas: Taboco (1,97 Ga), Rio Negro (1,59 Ga) e Coxim (1,74 Ga) com valores de ε Nd (0,54Ga) fortemente negativos (-7,0 a -5,9). As idades de cristalizações U-Pb obtidas: Taboco (540 ± 4.7 Ma), Rio Negro (547 ± 4.9 Ma), Coxim (540 ± 3.6 Ma) e Sonora (548 ± 5.9 Ma). O evento magmático norte aflora no Estado do Mato Grosso e é formado por intrusões rapakivíticas de dimensões batolíticas dispostas segundo direção ENE-WSW. As idades modelo T DM obtidas: São Vicente (1,165 Ga), Lajinha (1,508 Ga) e Araguaiana (1,375 Ga) com valores de ε Nd (0,50Ga) fortemente negativos (-2,86 a -5,87). As idades de cristalizações U-Pb obtidas: São Vicente (504 ± 8.9 Ma), Lajinha (505,4 ± 4.1 Ma) e Araguaiana (509,4 ± 2.2 Ma). Os granitóides da parte sul, mais antigos, são gerados em ambientes sin-colisional de arco continental, enquanto os do norte, mais jovens, são gerados em ambientes tardi a pós-colisional ou de descompressão durante a finalização do processo colisional. Ambos os eventos são constituídos por granitóides gerados partir de magmas de fontes distintas e independentes a partir do retrabalhamento de fragmentos crustais distintos, dominantemente ao sul, paleoproterozóicos e ao norte, mesoproterozóicos. Palavras-chave:Rochas granitóides, geocronologia, Faixa de Dobramento Paraguai, Grupo Cuiabá. Abstract Isotopic studies of neoproterozoic granitic rocks from the Paraguai Folded Belt. Neo-proterozoic Granitic Province of the southeast of Mato Grosso State is related to the evolutions of the Paraguai Folded Belt in the southeast border of the Amazonian Craton. It is constituted by seven igneous bodies distinct in two magmatic events intruded in epimetamorphic rocks of the Cuiabá Group. Southern magmatic event crops out in the Mato Grosso do Sul State in the shapes of fissural intrusions elongated and aligned along the NNE-SSW direction. Obtained T DM model ages: Taboco (1,97 Ga), Rio Negro (1,59 Ga) and Coxim (1,74 Ga) with strongly negative values of ε Nd (0,54Ga) (-7,0 a -5,9). Obtained U-PB crystallization ages: Taboco (540 ± 4.7 Ma), Rio Negro (547 ± 4.9 Ma), Coxim (540 ± 3.6 Ma) and Sonora (548 ± 5.9 Ma). Northern magmatic event crops out in the Mato Grosso State and is constituted by rapakivi intrusions of batholithic dimensions disposed along the direction ENE-WSW. Obtained T DM model ages: São Vicente (1,165 Ga), Lajinha (1,508 Ga) and Araguaiana (1,375 Ga) with negative values of ε Nd (0,50Ga) (-2,86 a -5,87). Obtained U-PB crystallization ages: São Vicente (504 ± 8.9 Ma), Lajinha (505,4 ± 4.1 Ma) and Araguaiana (509,4 ± 2.2 Ma). Granitoids from southern portion...

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The tectonic evolution of the Transbrasiliano Lineament in northern Paraná Basin, Brazil, as inferred from aeromagnetic data

et al. 2014

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Data from six airborne magnetic surveys were compiled and analyzed to develop a structural interpretation for the Transbrasiliano Lineament in northern Paraná Basin, Brazil. Magnetic lineaments, interpreted to reflect geologic contacts and structures at different depths, were illuminated using the matched-filter technique applied to aeromagnetic anomalies. Field-based structural measurements generally support our magnetic analysis. We estimated three primary magnetic zones: (i) a zone of deep magnetic sources at 20 km depth, (ii) an intermediate basement zone at 6 km depth, and (iii) a shallow zone of near-surface geological features at 1.5 km depth. The deepest zone exhibits three major NE trending crustal discontinuities related to the Transbrasiliano Lineament, dividing the region into four geotectonic blocks. Anomalies associated with the intermediate zone indicate directional divergence of subsidiary structures away from the main Transbrasiliano Fault, which strikes N30°E. The shallow magnetic zone includes near-surface post-Brasiliano orogenic granites. Our analysis identified NE trending sigmoidal lineaments around these intrusions, indicating intense zones of deformation associated with probable shear structures. At the shallow depth zone, magnetic anomalies caused by Cretaceous alkaline intrusive bodies and basalts of the Serra Geral Formation are enhanced by the matched-filter method. These igneous bodies are related to extensional NW striking lineaments and seismicity aligned along these lineaments suggests that they currently are reactivated. Prior to flexural subsidence of the Paraná Basin, reactivation processes along transcurrent elements of the Transbrasiliano Lineament promoted extensional processes and formed initial Paraná Basin depocenters. Cretaceous and more recent sedimentation also correlate with reactivations of NE striking structures.

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Os granitóides brasilianos da faixa de dobramentos Paraguai, MS e MT

Cited by 14 publications

References 0 publications

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

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

Estudos isotópicos das rochas granitóides neoproterozóicas da Faixa de Dobramento Paraguai

The tectonic evolution of the Transbrasiliano Lineament in northern Paraná Basin, Brazil, as inferred from aeromagnetic data

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