Archean Tectonic Setting of Granulite Terranes of the Superior Province, Canada: A View from the Bottom

Percival, John A.

doi:10.1007/978-94-009-2055-2_10

Cited by 9 publications

(21 citation statements)

References 54 publications

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“…3. Localisation de la région étudiée par Percival (1990Percival ( , 1991bPercival ( , 1994, Percival et al (1992) et Percival et Girard (1988) (modifiée de Percival et al, 1992) 26 (2), (5), (8) and (9) illustrated in Table 3.6. These reactions correspond to curves respectively noted (3 & 4),…”

Section: Siiencieuses Depuis Des Miííénaires Les Roches Du-viewccratunclassified

“…Un modèle tectonique basé sur l'étude du Complexe d'Ashuanipi et des lambeaux et enclaves métasédimentaires présentes dans les intrusions diatexitiques de ce complexe, a été proposé par Percival (1990Percival ( , 1991bPercival ( , 1994 et Percival et al (1992). Ces auteurs ont travaillé au NE de notre région d'étude ( Plusieurs interprétations ont été proposées pour la nature du contact entre les sousprovinces de La Grande et d'Opinaca.…”

Section: Modèles Antérieursunclassified

“…(1) Ces auteurs font référence à l'Ashuanipi mais ne mentionnent jamais la Sous- Percival (1990, 1991a Percival (1990, 1991a est inspiré de celui proposé pour l'interprétation de la Sous-province du Quético dans l'ouest de la Province du Supérieur par Percival et Williams (1989). Or, bien que le Quético contienne également des diatexites reliés à une fusion élevée, elles restent limitées et localisées et il n'existe rien de comparable à l'Ashuanipi dans l'ouest de la Province du Supérieur.…”

Section: Nouvelles éVidences De Terrain Et Lacunes Des Modèles Antériunclassified

“…En encart: carte de localisation générale de la Province du Supérieur. Percival (1990Percival ( ,1991bPercival ( , 1994, Percival et al ( 1992Percival et al ( ,2003 et Percival et Girard (1988) (modifiée de Percival et al, 1992). Percival et al (2003).…”

Section: L'est De La Province Du Supérieurunclassified

“…Ma (Mortensen et Percival, 1987;Percival, 1990;Chevé et Brouillette, 1995;David et Parent, 1997;Leclair et al, 1998). L'Ashuanipi est injectée par un cortège d'intrusions de monzogranite syntectoniques datées à 2647 ±2 Ma (Parent, 1998;Leclair et al, 1998).…”

Section: Introductionunclassified

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Interprétation tectonométamorphique du nord de la province du Supérieur, Québec, Canada /

Cadéron¹

2003

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Section: Siiencieuses Depuis Des Miííénaires Les Roches Du-viewccratunclassified

Section: Modèles Antérieursunclassified

Section: Nouvelles éVidences De Terrain Et Lacunes Des Modèles Antériunclassified

Section: L'est De La Province Du Supérieurunclassified

Section: Introductionunclassified

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Interprétation tectonométamorphique du nord de la province du Supérieur, Québec, Canada /

Cadéron¹

2003

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Dating granulite-facies structures and the exhumation of lower crust in the Moldanubian Zone of the Bohemian Massif

Svojtka

Košler

Venera

2001

Int J Earth Sci (Geol Rundsch)

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Deformation of granulite-facies rocks in the Moldanubian Zone of the southern Bohemian Massif is expressed in two intersecting planar fabrics -steeply disposed (S 1 ) and flat-laying (S 2 ) -which correspond to two deformation stages (D 1 ) and (D 2 ). The existing Sm-Nd garnet ages from banded granulite gneisses, new U-Pb zircon data from deformed granite intrusions within the granulite gneisses, and the P-T and field structural relations constrain the ages and P-T conditions of the two deformation phases. The early deformation (D 1 ) was associated with a HP-HT metamorphic stage with a minimum age of ca. 354 Ma which was followed by a nearisothermal decompression. A concordant U-Pb zircon age of 318±1 Ma dates the emplacement of intrusions of deformed granite into the granulite gneisses and constrains deformation phase (D 2 ). This phase was associated with an LP-HT metamorphism dated in the region at ca. 340-330 Ma. The available structural and isotopic data indicate that granulites in the southern Bohemian Massif were exhumed from lower to middle crust during compression. The structural relations and P-T-t data for the studied granulites are consistent with their exhumation by near-vertical extrusion of the softened orogenic root.

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Melt segregation and magma flow in migmatites: implications for the generation of granite magmas

Sawyer¹

1996

Earth and Environmental Science Transactions of the Royal Socie

129

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ABSTRACT:To form a granite pluton, the felsic melt produced by partial melting of the middle and lower continental crust must separate from its source and residuum. This can happen in three ways: (1) simple melt segregation, where only the melt fraction moves; (2) magma mobility, in which all the melt and residuum move together; and (3) magma mobility with melt segregation, in which the melt and residuum move together as a magma, but become separated during flow. The first mechanism applies to metatexite migmatites and the other two to diatexite migmatites, but the primary driving forces for each are deviatoric stresses related to regional-scale deformation. Neither of the first two mechanisms generates parental granite magmas. In the first mechanism segregation is so effective that the resulting magmas are too depleted in FeOT, MgO, Rb, Zr, Th and the REEs, and in the second no segregation occurs. Only the third mechanism produces magmas with compositions comparable with parental granites, and occurs at a large enough scale in the highest grade parts of migmatite terranes, to be considered representative of the segregation processes occurring in the source regions of granites.

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Archean Tectonic Setting of Granulite Terranes of the Superior Province, Canada: A View from the Bottom

Cited by 9 publications

References 54 publications

Interprétation tectonométamorphique du nord de la province du Supérieur, Québec, Canada /

Interprétation tectonométamorphique du nord de la province du Supérieur, Québec, Canada /

Dating granulite-facies structures and the exhumation of lower crust in the Moldanubian Zone of the Bohemian Massif

Melt segregation and magma flow in migmatites: implications for the generation of granite magmas

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