Les granites du Massif Central Fran�ais: �tude compar�e des leucogranites et granodiorites

Didier, Jean; Lameyre, J.

doi:10.1007/bf00376049

Cited by 50 publications

(14 citation statements)

References 9 publications

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“…of Limousin" [17,51] have been interpreted as the deep part of this magmatic arc, subsequently sheared during later tectono-metamorphic events [26]. In the monocyclic model, the Brévenne basin opened as a back arc-basin related to the northward subduction of the UGU [39], and the Morvan arc is not considered.…”

Section: From the Late Silurian To The Early Devonian The Medio Euromentioning

confidence: 99%

A review of the pre-Permian geology of the Variscan French Massif Central

Faure

Lardeaux

Ledru

2009

Comptes Rendus. Géoscience

223

196

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Section: From the Late Silurian To The Early Devonian The Medio Euromentioning

confidence: 99%

A review of the pre-Permian geology of the Variscan French Massif Central

Faure

Lardeaux

Ledru

2009

Comptes Rendus. Géoscience

223

196

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“…alumineux hypoalum Yang Chaoqun (1982) I MM-type CR-type M5-type MD-type Tischendorf and Palchen (1985) S; Didier and Lameyre (1969) C-type (Crustal) I M-type (Mixed or mantle) Didier et al (1982) (Leucogranites) (monzogranites and granodiorites) Mineralogy (QAP system) Lameyre (1980) (Leucogranites)…”

Section: Granites Mixtesmentioning

confidence: 99%

The Nature and Origin of Granite

Pitcher¹

1997

198

127

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“…These were emplaced following the Hercynian collisional orogeny (approximately 360-280 Ma). Two major granitoid rock families have been distinguished [Didier and Laineyre, 1969]. Leucogranites are muscovite-rich rocks, typically emplaced in the cores of large domal structures within high-temperature metamorphic series.…”

Section: Geological Setting and Petrographic Notesmentioning

confidence: 99%

Origin of microgranular enclaves in granitoids: Equivocal Sr‐Nd Evidence From Hercynian Rocks in the Massif Central (France)

Pin¹,

Binon²,

Belin³

et al. 1990

J. Geophys. Res.

100

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We examined the Rb‐Sr and Sm‐Nd systematics of three different, high‐level to subvolcanic granitoid plutons and their microgranular enclaves. The host granitoids are adamellites and grano‐diorites, while the enclaves are mostly microtonalites with igneous textures. The enclaves are rounded in shape and vary from <10 cm to >1 m across. Contacts with the enclosing granitoids are sharp and, mostly, nonlobate. The microtonalitic enclaves are similar in mineralogy to their hosts. Initial 87Sr/86Sr are all ≥0.7070 and initial εNd is −3.0 to −6.6 for both the enclaves and their hosts. This precludes a major input of an unmodified, mantle‐derived component, at the time of magma genesis. Nd isotopic contrasts between enclaves and hosts are 1 ε‐Nd‐unit at most. These data indicate broadly cogenetic origins for enclave‐host systems, though some enclaves have slightly less “crustal” signatures than the enclosing granitoids. There are several possible interpretations. (1) There may have been nearly complete isotopic homogenization between enclaves and host magmas derived from different starting parents. (2) The enclaves and granitoids could all have purely crustal origins. Enclaves might represent magmas derived from slightly less evolved protoliths or parental magma, or they could be concentrations of early formed crystals, with interstitial melt. (3) Basaltic magma, from the depleted mantle, could have thoroughly mixed with a large volume of crustal melt, in the lower crust. (4) There could have been a significant input of melt derived from an enriched mantle source. Several of these mechanisms may have played roles in the genesis of the granitoids and their enclaves. Nd isotopes do not always allow unequivocal recognition of mantle components in granitoid magmatism. We argue that enclaves of this type are probably not products of major mixing processes relevant to granitoid protoliths and large‐scale crustal evolution. They commonly result from second‐order mingling of broadly cogenetic magma fractions that may have a variety of different origins.

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Les granites du Massif Central Fran�ais: �tude compar�e des leucogranites et granodiorites

Cited by 50 publications

References 9 publications

A review of the pre-Permian geology of the Variscan French Massif Central

A review of the pre-Permian geology of the Variscan French Massif Central

The Nature and Origin of Granite

Origin of microgranular enclaves in granitoids: Equivocal Sr‐Nd Evidence From Hercynian Rocks in the Massif Central (France)

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