Origine et développement de litages dans des roches de composition granitique /

Solgadi, Fabien

doi:10.1522/030151515

Cited by 2 publications

(2 citation statements)

References 90 publications

(149 reference statements)

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“…The biotite granodiorite also contains diorite enclaves. According to some authors [14] [22] [23], these mineralogical features and the mafic enclaves are indicative of magma mixing. The presence of mafic microgranular enclaves in monzonites suggests the involvement of a mantle source [24] [25].…”

Section: Discussionmentioning

confidence: 99%

“…Minerals such as plagioclases, amphiboles, biotites and microclines have particular characteristics: ferromagnesian minerals (green hornblende and biotite) are arranged in clusters (Figure 8(a)). These mineral accumulations are the result of a segregation process either by gravity, convective flows or by compaction and expulsion of trapped residual liquids [14]. The microclines are surrounded by plagioclase (Figure 8(b)).…”

Section: Mineralogical Characteristics Of Magmatic Rocksmentioning

confidence: 99%

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The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

Boya¹,

Kouadio²,

Gnanzou³

et al. 2022

OJG

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This study aims to contribute to improve knowledge on geological formations of Comoé basin. The petrographic study of the geological formations of Koun Fao has highlighted two major lithological families: magmatic rocks consisting of monzonites, monzogranites, diorites, biotite granodiorites, syenites, porphyritic micromonzonites and porphyritic dacite and metamorphic rocks from sedimentary origin (quartz schists, meta-greywackes, schists, andalusite chloritoschist and paragneiss). These formations are affected by amphibolite to greenschist facies metamorphism and hydrothermal alteration (pervasive and vein) marked by the presence of quartz, epidotes, chlorites and sericite. Minerals such as andalusite, muscovite and chlorite characterize a local low pressure contact metamorphism in the andalusite chloritoschist. Remote sensing data (Landsat 8 image) coupled with field data allowed the production of a geological map of the area. The study of the structures and microstructures highlighted two deformation mechanisms. These are flattening and simple shear (ductile and brittle). The study area is affected by four deformation phases: D1 marked by a N-S to NNE-SSW elongation, D2 marked by a NW-SE to NNW-SSE compression phase, D3 which is a NE-SW to NNE-SSW transpression phase and D4, responsible for late structures, marked by a NW-SE to NNW-SSE transpression phase.

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Section: Discussionmentioning

confidence: 99%

Section: Mineralogical Characteristics Of Magmatic Rocksmentioning

confidence: 99%

The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

Boya¹,

Kouadio²,

Gnanzou³

et al. 2022

OJG

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Geon 14 to early Geon 13 granitoid magmatism in the Grenville Province of Canada, northeastern Laurentia: Distribution, geochemical patterns, and links with an active-margin setting

Indares

Moukhsil

Groulier

2023

Laurentia: Turning Points in the Evolution of a Continent

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Mesoproterozoic crust is widely exposed in the Grenville Province portion of northeastern Laurentia, where it is interpreted as an assemblage of two continental-arc segments separated by a composite arc belt (Quebecia) with island-arc remnants. A synthesis of the geologic context, types, and geochemical patterns of 1.5–1.35 Ga granitoids reveals a regional distribution in each segment, with dioritic to granitic plutonism variably associated with arc-related volcano-sedimentary belts in the south and inboard monzonitic to granitic plutonism in the north. In addition, belts of dioritic to granitic orthogneisses occupy intermediate positions in Quebecia and in the west. The inboard granites are consistently old in all segments (1.5–1.45 Ga), but the preserved volcano-sedimentary belts are older in the east and in Quebecia (1.5–1.45 Ga) and younger in the west (1.39? and 1.36 Ga), while the belts of orthogneisses show a large spread of ages at 1.45–1.37 Ga. Granitoids in the volcano-sedimentary belts and the orthogneisses include magnesian, calcic to calc-alkalic components to ferroan, alkali-calcic components. In contrast, the inboard plutons are dominantly ferroan and alkali-calcic to alkalic in the continental-arc segments, where they are locally associated with anorthosite-mangerite-charnockite-granite (AMCG) suites. Collectively, the different types of granitoid magmatism can be linked to an active margin, with subduction under northeastern Laurentia, involving arc building, arc rifting, back-arc opening and inboard extension, and amalgamation processes variably operating at different parts of the margin and at different times. In addition, the data provide a basis for comparison with other parts of the eastern to southwestern Laurentian margin in the 1.5–1.35 Ga time frame.

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Origine et développement de litages dans des roches de composition granitique /

Cited by 2 publications

References 90 publications

The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

Geon 14 to early Geon 13 granitoid magmatism in the Grenville Province of Canada, northeastern Laurentia: Distribution, geochemical patterns, and links with an active-margin setting

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Origine et développement de litages dans des roches de composition granitique /

Cited by 2 publications

References 90 publications

The Geological Formations of Koun Fao (East of C&#244;te d’Ivoire): Petrographic Characterization and Associated Deformations

The Geological Formations of Koun Fao (East of C&#244;te d’Ivoire): Petrographic Characterization and Associated Deformations

Geon 14 to early Geon 13 granitoid magmatism in the Grenville Province of Canada, northeastern Laurentia: Distribution, geochemical patterns, and links with an active-margin setting

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The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations