Distribution and petrogenetic behaviour of trace elements in granitic pegmatite quartz from South Norway

Larsen, Rune B.; Henderson, I. H. C.; Ihlen, Peter M.; Jacamon, Francois

doi:10.1007/s00410-004-0580-4

Cited by 142 publications

(94 citation statements)

References 22 publications

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“…Compared to quartz from natural samples, phosphorous in quartz is well within the reported range for P 2 O 5 enriched granites and monazite-bearing pegmatites that contain 7-10 ppm P (Breiter and Müller 2009) and 9-23 ppm P (Larsen et al 2004), respectively.…”

Section: The Effect Of Apatite On Defects Incorporation In Quartzsupporting

confidence: 67%

OH defects in quartz in granitic systems doped with spodumene, tourmaline and/or apatite: experimental investigations at 5–20 kbar

2016

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Section: The Effect Of Apatite On Defects Incorporation In Quartzsupporting

confidence: 67%

OH defects in quartz in granitic systems doped with spodumene, tourmaline and/or apatite: experimental investigations at 5–20 kbar

2016

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“…As impurezas dominantes são Al e Li e, em menor concentração, Ti e Ge. Tais elementos são comumente encontrados na estrutura do quartzo natural, na forma de impurezas substitucionais ou intersticiais (Götze et al 2004, Larsen et al 2004, Beurlen et al 2009b. Não foi detectada a presença de P, Mg, Ca e Sr. A grande concentração de Cr, Fe e Ni medida apenas na variedade rósea pode ser explicada pela presença de inclusões sólidas microscópicas, de morfologia arredondada, observadas no resíduo da digestão ácida.…”

Section: Resultsunclassified

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema

Miranda

Gonzaga

Guzzo

et al. 2012

Rev. bras. geociênc.

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Revista Brasileira de Geociências 42(2): 293-302, junho de 2012Arquivo digital disponível on-line no site www.sbgeo.org.br 293 ResumoEste estudo considera as transformações induzidas pela radiação γ sobre os defeitos estruturais em quartzo róseo e leitoso da Província Pegmatítica da Borborema (Paraíba e Rio Grande do Norte, Brasil). Amostras de coloração rósea e leitosa foram irradiadas com doses de raios γ ( 60 Co) entre 0,5 e 96 kGy. Defeitos pontuais relacionados às impurezas de Al, Ge, Li e grupos OH foram caracterizados por espectroscopias ultravioleta visível e infravermelha e ressonância paramagnética eletrônica, antes e após a irradiação. A espectrometria de massa com plasma indutivamente acoplado foi empregada para quantificar as concentrações de Al, Li, Ge, Fe, Ti e outras impurezas em fragmentos de diferentes tonalidades. 0 e o consequente escurecimento das amostras foi semelhante para ambos os tipos de quartzo. Análises preliminares por microscopia eletrônica mostraram a presença de fibras nanométricas apenas no resíduo da digestão ácida de amostras róseas, indicando que a coloração rósea do quartzo da Província Pegmatítica da Borborema está provavelmente relacionada às inclusões de dumortierita.Palavras-chave: quartzo natural; pegmatito granítico; radiação ionizante; espectroscopia; defeitos pontuais. Abstract Impurity-related point defects and gamma-radiation response of massive quartz from the Borborema pegmatite province, in Brazil.This work has investigated the changes induced by γ-radiation on impurity-related point defects in massive rose quartz from one deposit located at The Borborema Pegmatite Province (Northeast Region, in Brazil). Samples extracted from rose and colorless (milky) quartz blocks were irradiated with doses of 60 Co, from 0.5 to 96 kGy. Point defects related to Al, Ge, Li and OH were measured by optical, infrared, and electron paramagnetic resonance spectroscopy, prior and after irradiation. The contents of Al, Li, Ge, Fe, Ti and other impurities were measured by inductively-coupled plasma mass spectrometry in quartz fragments exhibiting rose, pale-rose, and milky colorations. 0 content with γ doses and the consequent rise in the intensity of smoky color were similar for both rose and colorless quartz. Scanning electron microscopy carried out in insoluble residues obtained after chemical dissolution of each type of quartz revealed the presence of nanometric fibers only in rose specimens. These results suggested that the cause of rose color in massive quartz from Borborema Pegmatite Province is probably related to the presence of dumortierite inclusions.

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“…Several studies document mobilisation of trace elements during recrystallisation using SEM-CL and trace element analysis in magmatic (e.g. Müller et al 2002;Larsen 2004;Jacamon 2006) and vein quartz (Van den Kerkhof et al 2004;Landtwing and Pettke 2005).…”

Section: Introductionmentioning

confidence: 99%

Coupled trace element mobilisation and strain softening in quartz during retrograde fluid infiltration in dry granulite protoliths

Sørensen

Larsen

2008

Contrib Mineral Petrol

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This study focuses on the retrograde rheological and chemical evolution of quartz and the behaviour of quartzites during retrograde metamorphism following dry high grade metamorphism at 750°C, 7 kbar. SEM-CL and LA-HR-ICP-MS are applied to document quartz texture and chemistry, respectively. Four generations of quartz were distinguished by SEM-CL; Qz1, Qz2, Qz3 and Qz4. Qz1, brecciated and partly dissolved old grains, is enriched in B, Al and Ti when compared with the other types. Qz2, formed during brecciation and partial dissolution of Qz1, has low Al contents (\50 ppm) but, due to rutile inclusions, variable Ti contents when occurring in amphibolite (210-10 ppm) but more consistent values when occurring in quartzites (peak value 32 ppm). Qz3, dark grey luminescent quartz forming fluid migration channels (fluid pathways), has Ti \ 5 ppm and Al contents below 10 ppm and B \ 1 ppm. Qz4, comprises are group of quartz later than Qz3 filling micron thick cracks and pods with very low luminescent quartz, i.e. darker than Qz3. The textural and chemical evolution of quartz in our study is explained by two major influxes of aqueous fluids during regional uplift and retrogression. They facilitated rehydration and recrystallisation in the otherwise dry high grade quartzites. The first introduction of aqueous fluids was associated with brecciation of the high grade quartz (Qz1) and dissolution/precipitation of quartz (Qz2). Ti in quartz geothermometry (Wark and Watson, Contrib Mineral Petrol 152(6):637-652) gives 626°C in agreement with the retrograde PT-path deduced from phase diagrams. Later fluid influx associated with scapolitisation of amphibolite caused localised recrystallisation (Qz3) and alteration of biotite to muscovite along mm-wide fluid migration channels. During subsequent deformation, Qz3 deformed plastically and recovered by subgrain rotation recrystallisation (SGR), resulting in a reduction of grain size, whereas Qz1 quartz formed micro faults. Qz2 was plastic but did not experience SGR to the same degree as Qz3 quartz. Increased plasticity and recovery rates most likely relate to an increased H 2 O fugacity and the depletion in trace elements of the quartz lattice by promoting strain softening processes dislocation climb and recovery.

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Distribution and petrogenetic behaviour of trace elements in granitic pegmatite quartz from South Norway

Cited by 142 publications

References 22 publications

OH defects in quartz in granitic systems doped with spodumene, tourmaline and/or apatite: experimental investigations at 5–20 kbar

OH defects in quartz in granitic systems doped with spodumene, tourmaline and/or apatite: experimental investigations at 5–20 kbar

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema

Coupled trace element mobilisation and strain softening in quartz during retrograde fluid infiltration in dry granulite protoliths

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