Calc-alkaline and tholeiitic dyke swarms of Tandilia, Rio de la Plata craton, Argentina: U–Pb, Sm–Nd, and Rb–Sr 40Ar/39Ar data provide new clues for intraplate rifting shortly after the Trans-Amazonian orogeny

Teixeira, Wilson; Pinese, José Paulo Peccinini; Iacumin, M.; Girardi, Vicente Antônio Vitório; Piccirillo, E. M.; Echeveste, Horacio; Ribot, Alejandro; Fernández, Raúl; Renne, Paul R.; Heaman, Larry M.

doi:10.1016/s0301-9268(02)00128-6

Cited by 48 publications

(31 citation statements)

References 38 publications

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“…1.5 and 1.4 Ga in the RPC. The age of 1,588 ± 11 Ma (Teixeira et al 2002) and geochemistry (Iacumin et al 2001) of mafic dykes in Tandilia, Argentina, suggest that anorogenic magmatism may have heralded the opening of these basins. A tectonic event around 1.25-1.20 Ga is well documented in the RPC and was characterized by tangential tectonics linked to the dextral Sarandí del Yí megashear.…”

Section: Discussion: the Río De La Plata Craton And Rodiniamentioning

confidence: 99%

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Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Gaucher

Frei

Chemale

et al. 2010

Int J Earth Sci (Geol Rundsch)

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Section: Discussion: the Río De La Plata Craton And Rodiniamentioning

confidence: 99%

“…2). On the basis of crosscutting relationships between mylonites and well-dated dike swarms (Teruggi et al 1974;Halls et al 2001;Teixeira et al 2002), Bossi et al (2005) suggested that the age of the Colonia shear zone is between 1,790 ± 5 Ma and 1,588 ± 11 Ma.…”

Section: Nueva Carrara Formationmentioning

confidence: 99%

Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Gaucher

Frei

Chemale

et al. 2010

Int J Earth Sci (Geol Rundsch)

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“…Florida Dyke Swarm (FDS) would be larger, denser and more widespread than previously documented (Fig. 6, Bossi et al, 1993b;Teixeira et al, 2002Teixeira et al, , 2013Halls et al, 2001). This Paleoproterozoic dyke swarm has been related to an incipient extensional event (aborted rift) younger than the orogenic events that previously affected the Piedra Alta Terrane (PAT), according to their geochronology and nonorogenic signatures (Bossi et al, 1993b;Halls et al, 2001;Teixeira et al, 2002Teixeira et al, , 2013Girardi et al, 2013).…”

Section: Florida Dyke Swarmmentioning

confidence: 73%

Aeromagnetic patterns in Southern Uruguay: Precambrian-Mesozoic dyke swarms and Mesozoic rifting structural and tectonic evolution

et al. 2020

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New high-resolution airborne magnetic data of Uruguay allowed constructing new maps concerning the spatial distribution of dyke swarms, main faults and other magnetic bodies, which compose the Uruguayan Shield. We combined geophysical analyses (vertical derivatives, upward continuation, Euler deconvolution), structural analyses of the magnetic maps and previous geological data in order to discriminate the main structural features of the Uruguayan Shield and contribute to a better understanding of its tectonic evolution. The magnetic maps revealed several outstanding features in the Uruguayan Shield. The Paleoproterozoic dyke swarm is larger, denser, more widespread and complex than originally thought, suggesting a possible plume origin. In addition, a new Mesozoic dyke swarm, as complex as the previous one, was identified crosscutting the Paleoproterozoic dyke swarm and the Neoproterozoic orogenic structures. Moreover, this swarm is connected to volcanic calderas in the Merín basin, and shows displacements along Neoproterozoic shear zones, in the magnetic maps, revealing its brittle reactivation during Mesozoic times. The new observations clarify how Proterozoic basement structures controlled the development of the Mesozoic rift. Paleoproterozoic dyke swarms were reactivated as normal faults and Neoproterozoic structures hindered the rift growth, deflecting the deformation in transcurrent movements. Meanwhile, the Mesozoic dyke swarm was developed in a perpendicular direction to the Neoproterozoic structures. Moreover, these findings contradict the current rift model for Uruguay and rise a new model in which the Mesozoic rift developed as two rift basins connected by a central transfer zone, generated by the reactivation of Dom Feliciano Belt structures, between the Sierra Ballena and Sarandí del Yí Shear Zones.

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“…On the other hand, significantly younger tholeiitic dikes (1.59 Ga) that crosscut both the calc-alkaline granitoids and the calc-alkaline dikes are linked to regional extensional episodes (Iacumin et al, 2001;Teixeira et al, 2002).…”

Section: Introduction and Geologic Overview Of The Brazilian Precambrmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar and Rb/Sr Geochronology of the Goiás-Crixás Dike Swarm, Central Brazil: Constraints on the Neoarchean-Paleoproterozoic Tectonic Boundary in South America, and Nd-Sr Signature of the Subcontinental Mantle

Costa

Girardi

Teixeira

2006

International Geology Review

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The Goiás-Crixás tholeiitic swarm comprises high TiO 2 (> 1.5 wt %, HTI) and low TiO 2 (< 1.5 wt%, LTI) types that crosscut Archean metamorphic rocks of the Crixás-Goiás Block in central Brazil. Petrographically, the dikes were divided into three groups: diabases, metabasites, and amphibolites. Rb-Sr and 40 Ar/ 39 Ar analyses performed on the diabases and metabasites define the emplacement age at 2490 ± 40 Ma; field relations indicate that the dikes were emplaced under an extensional regime after regional uplift and cooling of the Neoarchean crust. The εSrT (-21.89 to +46.52) and εNdT (-4.84 to +0.53) values of the swarm are consistent with a DMM mantle source enriched by an EMI component. This signature is comparable to those exhibited by the Paleoproterozoic Uauá (ca. 2.2 Ga) and Lavras (1.9 Ga) dike swarms of the São Francisco craton. In comparison, the isotopic patterns of the Florida (1.70-1.75 Ga) and Salvador (1.2-1.0 Ga) dikes, from the Rio de La Plata and São Francisco cratons, respectively, display larger εNd and smaller εSr variations, suggesting a greater influence of the EMI component on these younger swarms. From the perspective of continental-scale evolution, the Goiás-Crixás dike swarm signals an extensional episode in the Brazilian Precambrian shield associated with Neoarchean-Paleoproterozoic tectonics.

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Calc-alkaline and tholeiitic dyke swarms of Tandilia, Rio de la Plata craton, Argentina: U–Pb, Sm–Nd, and Rb–Sr 40Ar/39Ar data provide new clues for intraplate rifting shortly after the Trans-Amazonian orogeny

Cited by 48 publications

References 38 publications

Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Aeromagnetic patterns in Southern Uruguay: Precambrian-Mesozoic dyke swarms and Mesozoic rifting structural and tectonic evolution

⁴⁰Ar/³⁹Ar and Rb/Sr Geochronology of the Goiás-Crixás Dike Swarm, Central Brazil: Constraints on the Neoarchean-Paleoproterozoic Tectonic Boundary in South America, and Nd-Sr Signature of the Subcontinental Mantle

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Calc-alkaline and tholeiitic dyke swarms of Tandilia, Rio de la Plata craton, Argentina: U–Pb, Sm–Nd, and Rb–Sr 40Ar/39Ar data provide new clues for intraplate rifting shortly after the Trans-Amazonian orogeny

Cited by 48 publications

References 38 publications

Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Mesoproterozoic evolution of the Río de la Plata Craton in Uruguay: at the heart of Rodinia?

Aeromagnetic patterns in Southern Uruguay: Precambrian-Mesozoic dyke swarms and Mesozoic rifting structural and tectonic evolution

40Ar/39Ar and Rb/Sr Geochronology of the Goiás-Crixás Dike Swarm, Central Brazil: Constraints on the Neoarchean-Paleoproterozoic Tectonic Boundary in South America, and Nd-Sr Signature of the Subcontinental Mantle

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⁴⁰Ar/³⁹Ar and Rb/Sr Geochronology of the Goiás-Crixás Dike Swarm, Central Brazil: Constraints on the Neoarchean-Paleoproterozoic Tectonic Boundary in South America, and Nd-Sr Signature of the Subcontinental Mantle