Tectonic record, magmatic history and hydrothermal alteration in the Hercynian Guérande leucogranite, Armorican Massif, France

Ballouard, Christophe; Boulvais, Philippe; Poujol, Marc; Gapais, Denis; Yamato, Philippe; Tartèse, Romain; Cuney, Michel

doi:10.1016/j.lithos.2015.01.027

Cited by 65 publications

(71 citation statements)

References 74 publications

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“…This is common with granite suites elsewhere that have been affected by fractional crystallisation (Jung et al, 2000;Tartèse and Boulvais, 2010;Neiva et al, 2011;Ballouard et al, 2015). Given the strong correlation in SW England between geochemically similar granites (G1/G2 vs. G3/G4) and age, source heterogeneity (e.g.…”

Section: Accepted M Manuscriptmentioning

confidence: 67%

The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England

Simons

Shail

Andersen

2016

Lithos

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The Early Permian Cornubian Batholith was generated during an extensional regime following Variscan convergence within the Rhenohercynian Zone of SW England. Its component granites can be classified, using mineralogical, textural and geochemical criteria, into five main types, all of which are peraluminous (A/CNK >1.1): G1 (two-mica), G2 (muscovite), G3 (biotite), G4 (tourmaline) and G5 (topaz). G1 granites formed through up to 20% muscovite and minor biotite dehydration melting of a metagreywacke source at moderate temperatures and pressures (731-806°C, >5 kbar). Younger G3 granites formed through higher temperature, lower pressure (768-847°C, <4 kbar) biotite-dominated melting of a similar source. Partial melting was strongly influenced by the progressive lower-mid crustal emplacement of mafic igneous rocks during post-Variscan extension and a minor (<5-10%) mantle-derived component in the granites is possible. Two distinct fractionation series, G1-G2 and G3-G4, are defined using whole rock geochemical and mineral chemical data.Variations in the major elements, Ba, Sr and Rb indicate that G1 and G3 granites underwent 15-30% fractionation of an assemblage dominated by plagioclase, alkali feldspar and biotite to form, more evolved G2 and G4 granites respectively. Decreasing whole rock abundances of Zr, Th and REE support fractionation of zircon, monazite, apatite and allanite. Subsolidus alteration in G2 and G4 granites is indicated by non-primary muscovite and tourmaline and modification of major and trace element trends for G3-G4 granites, particularly for P 2 O 5 and Rb. Topaz (G5) granites show low Zr, REE and extreme enrichment in Rb (up to 1530 ppm) and Nb (79 ppm) that cannot be related in a straightforward manner to continued differentiation of the G1-G2 or G3-G4 series. Instead, they are considered to represent partial melting, mediated by granulite facies fluids, of a biotite-rich restite following extraction of

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Section: Accepted M Manuscriptmentioning

confidence: 67%

The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England

Simons

Shail

Andersen

2016

Lithos

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“…The Guérande leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma (Gapais et al, 1993Ballouard et al, 2015). This leucogranite is associated with several U deposits and occurrences, the most important one being the Pen Ar Ran deposit (Figs.…”

Section: Accepted M Manuscriptmentioning

confidence: 98%

“…This leucogranite is associated with several U deposits and occurrences, the most important one being the Pen Ar Ran deposit (Figs. 2 and 3), a perigranitic vein-type deposit structurally located above the apical zone of the Guérande intrusion (Ballouard et al, 2015). In the Pen Ar Ran deposit, the U mineralization is found at the contact between Ordovician felsic metavolcanics and black shales (Cathelineau, 1981).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…emplaced in the micaschists and below the porphyroid unit, which represented the upper brittle crust during the Upper Carboniferous (Gapais et al, 1993Turrillot et al, 2009;Ballouard et al, 2015).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…This contribution follows the study of Ballouard et al (2015) in which the tectonic, magmatic and hydrothermal framework for the Guérande leucogranite was presented. Here we provide a comprehensive set of radiometric data, oxygen isotope and fluid inclusion analyses, together with apatite fission track thermochronology, mineralogical, geochemical and geochronological data in an attempt to answer the following questions:…”

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Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Ballouard

Poujol

Boulvais

et al. 2017

Ore Geology Reviews

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Abstract:Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatially associated with Carboniferous peraluminous leucogranites. In the southern part of the Armorican Massif (French part of the EHB), the Guérande peraluminous leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma and is spatially associated with several U deposits and occurrences. The apical zone of the intrusion is structurally located below the Pen Ar Ran U deposit, a perigranitic vein-type deposit where mineralization occurs at the contact between black shales and Ordovician acid metavolcanics. In the Métairie-Neuve intragranitic deposit, uranium oxide-quartz veins crosscut the granite and a metasedimentary enclave. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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High‐Temperature Metamorphism and Syn‐ to Late‐Orogenic Magmatism

VILLAROS,

LAURENT,

COUZINIE

et al. 2023

The Variscan Belt of Western Europe 2

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Tectonic record, magmatic history and hydrothermal alteration in the Hercynian Guérande leucogranite, Armorican Massif, France

Cited by 65 publications

References 74 publications

The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England

The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

High‐Temperature Metamorphism and Syn‐ to Late‐Orogenic Magmatism

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