Alkaline magmatism in the Amambay area, NE Paraguay: The Cerro Sarambí complex

Gomes, Celso B.; Velázquez, Victor Fernandez; Azzone, Rogério Guitarrari; Paula, G.S.

doi:10.1016/j.jsames.2011.04.004

Cited by 10 publications

(10 citation statements)

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“…Additional multielement diagrams are also found for other areas: the Ponta Grossa Arch (Gomes et al 2011a, Azzone et al 2013, Beccaluva et al 2017, Chmyz et al 2017, Amambay (Gomes et al 2011b, Comin-Chiaramonti et al 2014, and the Alto Paranaíba province (Gomide et al 2016).…”

Section: Trace and Rare Earth Elementsmentioning

confidence: 71%

“…Nd model age values listed more recently (e.g., , Bizzi & Araújo 2005, Ruberti et al 2005, Scheibe et al 2005, Comin-Chiaramonti et al 2007a, 2014, Carlson et al 2007, Gomes et al 2011b) allow distinguishing among chronological events in the alkaline magmatism. Thus, the Lower Cretaceous alkaline potassic magmatism includes pre-and post-tholeiite rock types, the first group being only recognized in northern Paraguay.…”

Section: Nd-model Agesmentioning

confidence: 98%

“…Data for all presently known alkaline-carbonatite occurrences indicates that these rocks are of Cretaceous age, with two clearly distinguished formation intervals, 120-140 Ma and 70-90 Ma, Lower Cretaceous and Upper Cretaceous (Ulbrich & Gomes 1981, Rodrigues & Lima 1984, Berbert 1984, Gomes et al 1990, Gibson et al 1995a, Ruberti et al 2005, Comin-Chiaramonti et al 2007a, 2007b, Gomes et al 2011a, 2011b, Gomes & Comin-Chiaramonti 2017. Preferred ages for the occurrences are shown in Figure 2.…”

Section: Agesmentioning

confidence: 98%

“…REE fluorocarbonates are relatively abundant in late stage carbonatites (e.g., Barra do Itapirapuã, Cerro Manomó). Chondrite-normalized (Thompson 1982, Boynton 1984, McDonough & Sun 1995 REE distribution diagrams for various carbonatite complexes are discussed in several papers (e.g., Comin-Chiaramonti et al 2005c, 2007a, 2014, Gomes et al 2011a, 2011b, Azzone et al 2013, Gomide et al 2016, Beccaluva et al 2017, Chmyz et al 2017. Patterns are in general marked by high REE concentration and variable LREE/ HREE fractionation degrees.…”

Section: Trace and Rare Earth Elementsmentioning

confidence: 99%

“…More recently, papers such as those by Castorina et al (1996Castorina et al ( , 1997, Comin-Chiaramonti et al (2005c, 2014) and a general review by Comin-Chiaramonti et al (2007a), including some African occurrences in Angola and Namibia, became available. The associated silicate alkaline rocks, on the other hand, have more frequently been reviewed (Ulbrich & Gomes 1981, Woolley 1987, Morbidelli et al 1995, Comin-Chiaramonti et al 2005a, 2005d, 2007b, 2015, Brod et al 2005, Gomes et al 2011a, 2011b, Gomes & Comin-Chiaramonti 2017.…”

Section: Introductionmentioning

confidence: 99%

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Cretaceous carbonatites of the southeastern Brazilian Platform: a review

et al. 2018

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Section: Trace and Rare Earth Elementsmentioning

confidence: 71%

Section: Nd-model Agesmentioning

confidence: 98%

Section: Agesmentioning

confidence: 98%

Section: Trace and Rare Earth Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cretaceous carbonatites of the southeastern Brazilian Platform: a review

et al. 2018

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Constraining South Atlantic growth with seafloor spreading data

2014

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Recent models of South Atlantic opening history focus on early plate divergence by incorporating intracontinental deformation, which is poorly constrained. Aiming to avoid the uncertainties in this approach, we model the entire divergence history with a joint inversion for seafloor spreading data. For this history, the pre-Campanian motion parameters are the first to feature formal uncertainty estimates. We date the onset of spreading at 138 Ma, with movement along intracontinental accommodation zones leading to the assembly of South America by 123 Ma and Africa by 106 Ma. Part of the ridge in the Agulhas Basin jumped westward soon afterward toward the Bouvet plume, initiating the motion of a short-lived Malvinas Plate. The NE Georgia and Maud rises and Agulhas Plateau formed as a large igneous province over the plume. Farther north, part of the ridge jumped eastward toward the Tristan plume around 94-93 Ma but seems not to have resulted in independent plate motion. Our results show that the South Atlantic grew by diachronous breakup of continents on just two plates. Cretaceous intracontinental deformation in South America and Africa can be interpreted in terms of the accommodation of stress associated with northward propagation of this process. The pattern of accommodation is usually envisaged as focusing all of the strain in narrow belts. With our rotations, a commonly used set of such belts accounts instead for just 42-67% of the implied total strain. We suggest that the remainder was accommodated at all scales within the continental interiors and the extended continental margins.

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