Quartz fabric transition in a cooling syntectonic granite (Hermitage Massif, France)

Gapais, Denis; Barbarin, Bernard

doi:10.1016/0040-1951(86)90171-x

Cited by 176 publications

(82 citation statements)

References 29 publications

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“…Gapais and Barbarin, 1986;Hibbard, 1987;Paterson et al, 1989;Vernon, 2000;Passchier and Trouw, 2005) − In the Yinmawanshan pluton, samples with magmatic and weak solid-state flow evidences occupy more than 75% of the pluton surface (Fig. 9).…”

Section: Microstructures and Petrofabric Analysesmentioning

confidence: 99%

Metamorphic Core Complex dynamics and structural development: Field evidences from the Liaodong Peninsula (China, East Asia)

Charles¹,

Gumiaux²,

Augier³

et al. 2012

Tectonophysics

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International audienceMetamorphic Core Complexes (MCC) constitute remarkable features within wide rifts. Based on analogue and numerical modelling, MCC dynamics and structural development are mainly controlled by first geothermal gradient, second the compositional layering, and after the strain rate and partial melting. In the Late Mesozoic, continental extension occurred in East Asia leading to the development of MCC, magmatism and extensional sedimentary basins. Based on an integrated study (i.e. structural and finite strain analysis, petrofabrics, Anisotropy of Magnetic Susceptibility (AMS) and U/Pb on zircon dating), this paper aims at constraining the tectonic evolution and deformation mechanisms in the South Liaodong Peninsula (NE China). The Gudaoling massif is identified as a "migmatitic" MCC developed from Upper Jurassic (ca. 157-154 Ma) to Early Cretaceous (ca. 128-113 Ma). Intrusion of the Yinmawanshan synkinematic pluton (Early Cretaceous) to the south of the dome marks out the final stages of shearing along the Gudaoling detachment zone and of exhumation of the MCC into the upper crust. The Gudaoling MCC and the Yinmawanshan pluton stay in line with the coeval South Liaodong MCC, to the south, all making a ~ 140x30km wide extensional band formed during a regional E-W to NW-SE crustal stretching. The area shows a bi-phased development with a "slow" and a "fast" stage which correspond to (1) crustal necking and (2) dome amplification/exhumation stages according to published thermo-mechanical modelling results. Finally, the Gudaoling MCC lower unit almost exclusively displays migmatites and anatectic granitoids of Late Jurassic and Early Cretaceous, respectively. Occurrence of partial melting during earlier stages of extension seems controlling the initiation of MCC (as a soft anomaly within lower crust). In East Asia, a regional-scale thermal event, during Jurassic-Cretaceous times, may have significantly reduced the bulk lithosphere strength and locally induced partial melting, emphasizing pervasive deformations and development of a wide rift system

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Section: Microstructures and Petrofabric Analysesmentioning

confidence: 99%

Metamorphic Core Complex dynamics and structural development: Field evidences from the Liaodong Peninsula (China, East Asia)

Charles¹,

Gumiaux²,

Augier³

et al. 2012

Tectonophysics

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“…Some of the biotite grains show kinking or undulatory extinction microstructures, which suggest plastic deformation. Sample MV13 shows rectangular contouring of quartz grain boundaries illustrating high mobility of grain boundaries at elevated temperature (Gapais and Barbarin, 1986).…”

Section: Microstructural Observationsmentioning

confidence: 99%

Structure of late Variscan Millevaches leucogranite massif in the French Massif Central: AMS and gravity modelling results

Gébelin

Martelet

Chen

et al. 2006

Journal of Structural Geology

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In the Limousin area, Variscan leucogranitic plutons are spatially associated with normal faults and major strike-slip shear zones that are a continuation of the South Armorican shear zone. Our study focuses on the large N-S-trending Millevaches granitic massif (Massif Central, France), and intends to highlight, through gravity modelling, structural and anisotropy of magnetic susceptibility (AMS), the massif structure at depth and to discuss the mode of emplacement of granites within a strike-slip tectonic context. The mica subfabric suggests that the magnetic foliations display a general NW-SE sub-horizontal pattern on both sides of the N-S Pradines dextral wrench fault zone that deforms the core of the massif on 5 km width. The magnetic lineation trend exhibits a sigmoïdal pattern, N-S in the Pradines fault zone and NW-SE on both sides of it, which are consistent with a dextral wrench component. The horizontal magnetic foliations and lineations are consistent with the thin granite laccolith model. There is no significant imprint of the extensional Variscan belt collapse on the internal fabric of Millevaches granites than the tectonic dextral transcurrent movement prevailing in this area.

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“…These submagmatic structures are recorded by the homogenous preferred orientation of minerals at a regional scale, the scale of outcrops and in thin section. The flattening of quartz crystals commonly found in syntectonic granites (Gapais & Barbarin 1986) is a clear example of magma deformation reaching the rheological threshold. These structures could be formed under conditions of decreasing temperatures and increasing strain rates, as expected in syntectonic granites.…”

Section: Discussionmentioning

confidence: 99%

Protracted deformation during cooling of the Paleoproterozoic arc system as constrained by 40Ar/39Ar ages of muscovite from brittle faults: the Transamazonan Bacajá Terrane, Brazil

et al. 2017

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ABSTRACT:In the Paleoproterozoic Transamazonas Province, synkinematic granitogenesis has taken place synchronously with compressive tectonic stress. The synkinematic character of the granites is marked by their WNW elongate shape, and by the presence of pervasive and concordant synmagmatic foliation. Ductile shear zones are concordant to the previous regional WNW structures, and tend to be accommodated along contacts between Rhyacian synkinematic granitoids and both Archean orthogneisses and Siderian metabasites. Locally phyllonitic shear zones and brittle-ductile shear zones with cataclasites are oriented subparallel to the preexisting ductile foliation. Late orogenic brittle faults N30E-trending strike-slip faults are either sinistral or destral. 40

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Quartz fabric transition in a cooling syntectonic granite (Hermitage Massif, France)

Cited by 176 publications

References 29 publications

Metamorphic Core Complex dynamics and structural development: Field evidences from the Liaodong Peninsula (China, East Asia)

Metamorphic Core Complex dynamics and structural development: Field evidences from the Liaodong Peninsula (China, East Asia)

Structure of late Variscan Millevaches leucogranite massif in the French Massif Central: AMS and gravity modelling results

Protracted deformation during cooling of the Paleoproterozoic arc system as constrained by 40Ar/39Ar ages of muscovite from brittle faults: the Transamazonan Bacajá Terrane, Brazil

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