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

Sallet, Ricardo; Price, Jonathan D.; Babinski, Marly; Moritz, Robert; Souza, Zorano Sérgio de; Chiaradia, Massimo

doi:10.1016/j.chemgeo.2015.02.011

Cited by 15 publications

(20 citation statements)

References 130 publications

(201 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Durante a ascensão na crosta, o magma básico a intermediário induziu calor, propiciando a fusão parcial do embasamento encaixante, originando assim, magmas ácidos -fácies graníticas -com os quais exibe feições mixing e mingling. Sallet et al (2015) demonstram, por meio de estudos geoquímicos e isotópicos no batólito de Acari, que rochas shoshoníticas não constituem o magma parental dos tipos félsicos (granitos). Para Neves et al (2000) e Hollanda et al (2003), os altos teores de K 2 O, Sr e Nd radiogênicos das rochas máficas presentes em granitoides neoproterozoicos da Província Borborema corroboram a fusão parcial do manto superior.…”

Section: Discussionunclassified

Geoquímica do magmatismo Ediacarano Serra do Caramuru, NE da Província Borborema, RN, Brasil

Filho

Souza

2016

Geol. USP. Sér. Cient.

View full text Add to dashboard Cite

Os stocks Serra do Caramuru e Tapuio (magmatismo Serra do Caramuru), localizados no extremo NE do Domínio Rio Piranhas-Seridó (RN), são representantes do plutonismo ediacarano a cambriano da Província Borborema. Análises químicas de rocha total (elementos maiores e traço, incluindo elementos terras raras) em amostras provenientes principalmente do stock Serra do Caramuru permitiram efetuar a caracterização geoquímica deste magmatismo. Foram identificadas as fácies diorítica, granítica porfirítica, granítica equigranular I e granítica equigranular II, além de diques e sheets graníticos. A fácies diorítica é leucocrática a melanocrática, rica em biotita e hornblenda. As fácies graníticas são hololeucocráticas a leucocráticas, com biotita e eventualmente hornblenda. A variação no conteúdo de óxidos e elementos traço sugere o fracionamento de zircão, apatita, titanita, clinopiroxênio (em dioritos), biotita, hornblenda, allanita, plagioclásio, microclina e granada (em diques tardios). O comportamento de Zr, La e Yb indica que dioritos não constituem o magma parental dos granitos. Por outro lado, as fácies graníticas parecem ser cogenéticas, apresentando trends de diferenciação e espectros de elementos terras raras (ETR) análogos [12,3≤(La/Yb)N≤190,8; Eu/Eu*=0,30-0,68]. O padrão de ETR de diques e sheets graníticos [6,96≤(La/Yb)N≤277,84; Eu/Eu*=0,18-0,58] sugere não cogeneticidade ao magmatismo Serra do Caramuru. A fácies diorítica é metaluminosa, shoshonítica, enquanto os granitos são metaluminosos a ligeiramente peraluminosos, cálcio-alcalinos de alto potássio. Diagramas envolvendo óxidos e elementos traço corroboram um ambiente pós-colisional. Os dados aportados permitem correlacionar o magmatismo Serra do Caramuru ao grupo de granitoides pós-colisionais, cálcio-alcalinos de alto potássio com eventuais associações shoshoníticas, do Domínio Rio Piranhas-Seridó.

show abstract

Section: Discussionunclassified

Geoquímica do magmatismo Ediacarano Serra do Caramuru, NE da Província Borborema, RN, Brasil

Filho

Souza

2016

Geol. USP. Sér. Cient.

View full text Add to dashboard Cite

show abstract

“…The partially melted continental crust form migmatites where the anatectic granitic melt crystallize as a leucosome network along with a residual refractory mineral assembly or melanosome, usually bearing neo-formed or peritectic phases (e.g., Sawyer 2010). The mineralogical and chemical composition of the leuco-and melanosome are determined by the prevailing temperature and pressure, the presence of a fluid phase and its composition, and the chemical and mineralogical nature of the partially melted protolith (e.g., Gao et al 2016;Sallet et al 2015;Weinberg and Hasalovà 2015).…”

Section: Introductionmentioning

confidence: 99%

“…DOI: https://doi.org/10.2138/am-2022-8663. http://www.minsocam.org/ and Johannes 1991; Sallet et al 2015;Sawyer 2010;Weinberg and Hasalovà 2015) (ii) fluidabsent muscovite dehydration melting in the temperature range of 650 to 750 °C (e.g., Anenburg and Katzir 2014;Brearley and Rubie 1990;Castro et al 2000;Dyck et al 2019;Gardien et al 1995;Michaud et al 2021;Patiño Douce and Harris 1998;Storre 1982) and…”

Section: Introductionmentioning

confidence: 99%

“…(iii) fluid-absent biotite and amphibole dehydration melting at higher temperatures, in the range of 850 to 900 °C (e.g., Michaud et al 2021;Patiño Douce and Beard 1995;Peterson et al 1991;Pickering and Johnston 1998;Sallet et al 2015;Skjerlie and Johnston 1993;Thompson 1982;Vielzeuf and Holloway 1988) Fluid-absent melting reactions by dehydration of micas (and amphibole) implies a potential fractionated OH-F-Cl release from their hydroxyl site to the melt. Consequently, the residual and neo-formed hydroxyl bearing phases may acquire different OH-F-Cl compositions (e.g., Fink and Thompkins 2017;Hansen and Harlov 2007;Peterson et al 1991;Pickering and Johnston 1998;Sallet et al 2015Sallet et al , 2018. On the other hand, anatexis under fluid saturation by external influx at near eutectic temperatures may allow the micas to remain stable while quartz + feldspars experience partial melting (Weinberg and Hasalovà 2015, and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we experimentally investigated the geochemical behavior of F in peraluminous leucogranites and pegmatites (e.g., Nabelek 2019) during the anatexis of twomica protoliths. Attempts to characterize the Cl content yielded consistently low Cl contents near the detection limit of standard analytical methods (Sallet et al 2015(Sallet et al , 2019. The experiments aimed to determine how F partitions between mica and melt during anatexis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites

Sallet

Price

Ribeiro

et al. 2023

American Mineralogist

View full text Add to dashboard Cite

Fluorine behavior during the partial melting of two-mica bearing protoliths have been experimentally investigated at 700 to 930 °C and 0.4 and 0.6 GPa. Muscovite dehydration and H2O-HF fluid assisted partial melting experiments were carried out using both a natural and synthetic two-mica schist made of natural micas. The mineral composition of the experiments was assessed by BSE imaging and EDS analyses. The F, Cl and major elements contents of the glass and micas were determined by EPMA.The muscovite dehydration melting reaction is muscovite + quartz + plagioclase = peraluminous melt + biotite + sillimanite + potassic feldspar ± hercynite. The starting biotite stays largely stable showing only minor melt + ilmenite and trace magnetite formation in the cleavages. The neo-formed biotite shows similar F contents and a slightly higher XSid component when compared to the starting biotite. HF-added experiments yield F-rich neoformed biotite.The obtained melts consisted of a peraluminous leucogranite with F contents increasing with F-rich protoliths. The bulk partition coefficient DF schist/melt increases from 0.5 to 3.0 when the F content of the protolith rises from 0.05 to 1.2 wt%. The partition coefficient, KdF Bt/melt , increases from 2.0 to 6.0 where the biotite MgO content increases from 5 to 18 wt%.The natural partition coefficient KdF Bt/Ms , measured for a set of rocks with a varied lithology from the Seridó Belt, NE, Brazil, was 2.7 ± 0.5.The obtained F partition coefficients, along with published F partition coefficients, between biotite and melt, biotite and muscovite, and fluid and melt, allow for the modeling of F behavior during muscovite dehydration and fluid-present melting. F-rich, two-mica protoliths will increase F partitioning in favor of the micaceous anatectic residue compared This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

show abstract

Natural and experimental fluorine substitution in biotite: Implications for fluid-rock thermochronometry and application to the Seridó Belt, northeastern Brazil

2018

View full text Add to dashboard Cite

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

Cited by 15 publications

References 130 publications

Geoquímica do magmatismo Ediacarano Serra do Caramuru, NE da Província Borborema, RN, Brasil

Geoquímica do magmatismo Ediacarano Serra do Caramuru, NE da Província Borborema, RN, Brasil

Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites

Natural and experimental fluorine substitution in biotite: Implications for fluid-rock thermochronometry and application to the Seridó Belt, northeastern Brazil

Contact Info

Product

Resources

About