Intralithospheric differentiation and crustal growth: Evidence from the Borborema province, northeastern Brazil

Neves, Sérgio P.; Mariano, Gorki; Guimarães, Ignez P.; Filho, Adejardo Francisco da Silva; Melo, Silvana C.

doi:10.1130/0091-7613(2000)028<0519:idacge>2.3.co;2

Cited by 8 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our experimental and geochemical data for the Seridó Belt agree with previous findings by Neves et al (2000) for the petrogenesis of the high-K calcalkaline õplutons of the Borborema Province. Widespread fluidabsent melting occurred with heat supplied by underplating mafic magmas (e.g., Huppert and Sparks, 1988;Bergantz, 1989;Roberts and Clemens, 1993;Petford and Gallagher, 2001).…”

Section: Neoproterozoic Granitessupporting

confidence: 93%

“…The felsic rocks exhibit strongly negative ε Nd and radiogenic Sr. Such isotopic features are consistent with their origin by continental anatexis (Jardim de Sá, 1994;Ferreira et al, 1998;Neves et al, 2000;Hollanda et al, 2003). Geochemical models presented by Neves et al (2000) suggest that the felsic rocks were generated by the 20 to 30% partial melting of meta-igneous protoliths, with the heat for melting supplied by the concurrent intrusion of mafic melts (e.g., Huppert and Sparks, 1988;Bergantz, 1989;Roberts and Clemens, 1993;Petford and Gallagher, 2001).…”

Section: Neoproterozoic Granitessupporting

confidence: 72%

“…The mafic rocks of the Acari and other Neoproterozoic plutons of the Borborema Province are characterized by high K 2 O content and radiogenic Sr and N. These isotopic features were previously related to the partial melting of a metasomatized mantle (Neves et al, 2000;Hollanda et al, 2003). Our geochemical and isotopic data obtained for the Acari pluton mafic rocks corroborates this interpretation.…”

Section: Neoproterozoic Granitesmentioning

confidence: 93%

“…The Acari intrusion of the Seridó Belt is a typical example of Neoproterozoic high-K calc-alkaline mafic-felsic plutonism in the Borborema Province (e.g., Nascimento et al, 2000;Neves et al, 2000;Hollanda et al, 2003;Archanjo et al, 2013). The felsic rocks exhibit strongly negative ε Nd and radiogenic Sr.…”

Section: Neoproterozoic Granitesmentioning

confidence: 97%

“…While the fluid-absent melting of micas and amphibole is considered by many petrologists to be the main process for generating H 2 O-undersaturated felsic liquids (e.g., Clemens and Vielzeuf, 1987;Le Breton and Thompson, 1988;Vielzeuf and Holloway, 1988;Johnston, 1993, 1996;Patiño Douce, 1995;Patiño Douce and Beard, 1995;Montel and Vielzeuf, 1997;Stevens et al, 1997;Castro et al, 2000;Nair and Chacko, 2002), numerous geochemical and phase stability assessments suggest that melting may also involve H 2 O-fluxed reactions (Wickham, 1987;McLellan, 1988;Yardley and Barber, 1991;Mogk, 1992;Jung et al, 2000;Barnes et al, 2002;Slagstadt et al, 2005;Acosta-Vigil et al, 2006;Ward et al, 2008;Genier et al, 2008;Berger et al, 2008;Sawyer, 2010;Weinberg and Hasalová, 2014). Chemical Geology 400 (2015) The Seridó Belt of northeastern Brazil hosts several intrusions with distinct chemical affinities: Neoproterozoic high-K calcalkaline granitoids and Cambrian peraluminous pegmatitic granites and zoned pegmatites (e.g., Ferreira et al, 1998;Nascimento et al, 2000;Neves et al, 2000;Hollanda et al, 2003Hollanda et al, , 2010Guimarães et al, 2004;Baumgartner et al, 2006). The emplacement of these rocks is strongly controlled by transcurrent shear zones that cross the Neoproterozoic metasedimentary sequences and their Paleoproterozoic orthogneiss basement at the Seridó Belt (e.g., Archanjo and Bouchez, 1991;Corsini et al, 1991;Archanjo ...…”

Section: Introductionmentioning

confidence: 97%

See 4 more Smart Citations

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

et al. 2015

View full text Add to dashboard Cite

Section: Neoproterozoic Granitessupporting

confidence: 93%

Section: Neoproterozoic Granitessupporting

confidence: 72%

Section: Neoproterozoic Granitesmentioning

confidence: 93%

Section: Neoproterozoic Granitesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

et al. 2015

View full text Add to dashboard Cite

Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

Ganade

Weinberg

Caxito

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Dispersion and deformation of cratonic fragments within orogens require weakening of the craton margins in a process of decratonization. The orogenic Borborema Province, in NE Brazil, is one of several Brasiliano/Pan-African late Neoproterozoic orogens that led to the amalgamation of Gondwana. A common feature of these orogens is that a period of extension and opening of narrow oceans preceded inversion and collision. For the case of the Borborema Province, the São Francisco Craton was pulled away from its other half, the Benino-Nigerian Shield, during an intermittent extension event between 1.0–0.92 and 0.9–0.82 Ga. This was followed by inversion of an embryonic and confined oceanic basin at ca. 0.60 Ga and transpressional orogeny from ca. 0.59 Ga onwards. Here we investigate the boundary region between the north São Francisco Craton and the Borborema Province and demonstrate how cratonic blocks became physically involved in the orogeny. We combine these results with a wide compilation of U–Pb and Nd-isotopic model ages to show that the Borborema Province consists of up to 65% of strongly sheared ancient rocks affiliated with the São Francisco/Benino-Nigerian Craton, separated by major transcurrent shear zones, with only ≈ 15% addition of juvenile material during the Neoproterozoic orogeny. This evolution is repeated across a number of Brasiliano/Pan-African orogens, with significant local variations, and indicate that extension weakened cratonic regions in a process of decratonization that prepared them for involvement in the orogenies, that led to the amalgamation of Gondwana.

show abstract

Diorites of the High-K Calc-Alkalic Association: Geochemistry and Sm-Nd Data and Implications for the Evolution of the Borborema Province, Northeast Brazil

Mariano

Neves

Filho

et al. 2001

International Geology Review

Self Cite

View full text Add to dashboard Cite

Accretion of exotic terranes during the Cariris Velhos (late Mesoproterozoic to early Neoproterozoic) and Brasiliano (late Neoproterozoic) events has been proposed as an important process of continental growth in Borborema province, northeastern Brazil. If this hypothesis holds true, it is reasonable to assume that the roots of these accreted blocks have variable chemical and isotopic compositions. Here, we investigate this possibility using lithospheric-derived high-K calc-alkalic diorites. These rocks are widespread throughout the province and occur in areas proposed to represent distinct tectonic terranes. The similar geochemical and Sm-Nd isotopic signatures of the diorites (T DM from 1.7 to 2.0 Ga), except for one pluton, impose serious limitations to the terrane accretion model in Borborema province. On the contrary, these data strongly suggest that a large portion of the province is underlain by a LILE-enriched metasomatized lithospheric mantle formed around 2.0 Ga.

show abstract

Intralithospheric differentiation and crustal growth: Evidence from the Borborema province, northeastern Brazil

Cited by 8 publications

References 0 publications

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

Decratonization by rifting enables orogenic reworking and transcurrent dispersal of old terranes in NE Brazil

Diorites of the High-K Calc-Alkalic Association: Geochemistry and Sm-Nd Data and Implications for the Evolution of the Borborema Province, Northeast Brazil

Contact Info

Product

Resources

About