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Journal articles on the topic 'Roches granitiques'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Esteoule-Choux, J., and C. Blanchet. "L'alteration directe de muscovites et de biotites en halloysite: mise en evidence par microscopie electronique a balayage." Clay Minerals 22, no. 1 (1987): 11–20. http://dx.doi.org/10.1180/claymin.1987.022.1.02.

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ResumeL'altération de biotites et de muscovites en halloysite a été mise en évidence par l'étude en MEB dans l'altération de roches granitiques et de micaschistes. Cette transformation débute par le développement d'un réseau losangique à la surface des feuillets de micas. La croissance par épitaxie de tubes d'halloysite est parfois accompagnée par celle de cristaux de goethite. Le MEB montre que l'halloysite se forme directement à partir du mica et qu'elle apparaît dans les tous premiers stades de l'altération, quelles que soient les conditions.

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2

Thurston, Phillips C. "Igneous Rock Associations 19. Greenstone Belts and Granite−Greenstone Terranes: Constraints on the Nature of the Archean World." Geoscience Canada 42, no. 4 (2015): 437. http://dx.doi.org/10.12789/geocanj.2015.42.081.

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Greenstone belts are long, curvilinear accumulations of mainly volcanic rocks within Archean granite−greenstone terranes, and are subdivided into two geochemical types: komatiite−tholeiite sequences and bimodal sequences. In rare instances where basement is preserved, the basement is unconformably overlain by platform to rift sequences consisting of quartzite, carbonate, komatiite and/or tholeiite. The komatiite−tholeiite sequences consist of km-scale thicknesses of tholeiites, minor intercalated komatiites, and smaller volumes of felsic volcanic rocks. The bimodal sequences consist of basal t

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3

Gasc, Jean-Pierre, Corinne Sarthou, Romain Garrouste, Jean-François Villiers, Georges Cremers, and Jean-Marc Thiollay. "Inselbergs et savanes-roches en Guyane : biodiversité et conservation des milieux associés aux affleurements granitiques." Journal d'agriculture traditionnelle et de botanique appliquée 40, no. 1 (1998): 311–27. http://dx.doi.org/10.3406/jatba.1998.3676.

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4

Lageat, Yannick. "L’érosion différentielle dans les roches cristallines : l’exemple de la région de Barberton dans le Transvaal oriental, république d’Afrique du Sud." Géographie physique et Quaternaire 32, no. 2 (2011): 105–17. http://dx.doi.org/10.7202/1000344ar.

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Les traits majeurs du relief de la région de Barberton, au pied du Drakensberg du Transvaal, section du Grand Escarpement d’Afrique australe, relèvent d’une érosion différentielle très nuancée dans le socle cristallin précambrien, à partir d’une surface d’aplanissement gauchie, provisoirement datée de l’Éogène. Les recherches poursuivies par les géologues de l’université du Witwatersrand (Johannesburg) dans le Transvaal oriental montrent quel fructueux parti la géomorphologie peut tirer des reconnaissances détaillées portant sur la pétrographie et le mode de gisement des roches cristallines. L

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5

Woo, Ik, Jean-Alain Fleurisson, Yoen-Jun Park, et al. "Essais d’altération chimique accélérée au laboratoire par le double extracteur Soxhlet. Application à des roches granitiques de Corée du Sud." Bulletin of Engineering Geology and the Environment 67, no. 3 (2008): 443–52. http://dx.doi.org/10.1007/s10064-008-0140-7.

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6

ALLOU, B. A. "Une Correlation Genetique entre les Roches Granitiques, et les Depots Eluvionnaires, Colluvionnaires et Alluvionnaires de Columbo-Tantalite d'Issia, Centre-Ouest de la Cote d'Ivoire." Exploration and Mining Geology 14, no. 1-4 (2005): 61–77. http://dx.doi.org/10.2113/gsemg.14.1-4.61.

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7

Marcoux, Éric, Benjamin Barré, Michel Pichavant, and Marc Poujol. "Âge et genèse de la coupole granitique à métaux rares (Sn, Li, Nb-Ta, W) de Montebras (Creuse, Massif central français)." BSGF - Earth Sciences Bulletin 192 (2021): 16. http://dx.doi.org/10.1051/bsgf/2020042.

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La coupole de Montebras est un petit massif de granite à métaux rares (Sn, W, Li, Nb-Ta) situé au nord du Massif Central Français qui se met en place au Carbonifère supérieur dans un encaissant plus ancien, le granite de Chanon (357,2 ± 2,1 Ma). Deux épisodes magmatiques, un microgranite (316,1 ± 4,3 Ma) et un leucogranite albitique (309,8 ± 3,9 Ma), sont distingués. Le second développe à son toit des formations de contact, notamment une puissante pegmatite stockscheider (309,7 ± 4,5 Ma), passant vers l’est à des greisens à lithium et des filons plats de quartz stannifères anciennement exploit

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8

Corrigan, David, Natasha Wodicka, Christopher McFarlane, et al. "Lithotectonic Framework of the Core Zone, Southeastern Churchill Province, Canada." Geoscience Canada 45, no. 1 (2018): 1–24. http://dx.doi.org/10.12789/geocanj.2018.45.128.

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The Core Zone, a broad region located between the Superior and North Atlantic cratons and predominantly underlain by Archean gneiss and granitoid rocks, remained until recently one of the less well known parts of the Canadian Shield. Previously thought to form part of the Archean Rae Craton, and later referred to as the Southeastern Churchill Province, it has been regarded as an ancient continental block trapped between the Paleoproterozoic Torngat and New Quebec orogens, with its relationships to the adjacent Superior and North Atlantic cratons remaining unresolved. The geochronological data

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9

Toure, S., M. Caen-Vachette, and P. Tempier. "Nouvelles données pétrographiques, géochimiques et géochronologiques du massif ‘granitique’ de Bondoukou (Côte d'Ivoire) mise en évidence d'un âge Burkinien, par isochrone Rb/Sr sur roches totales." Journal of African Earth Sciences (1983) 6, no. 3 (1987): 269–74. http://dx.doi.org/10.1016/0899-5362(87)90068-6.

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10

LaFlamme, Crystal, Christopher R. M. McFarlane, and David Corrigan. "Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization." Geoscience Canada 42, no. 3 (2015): 305. http://dx.doi.org/10.12789/geocanj.2015.42.065.

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SUMMARYThe Repulse Bay block (RBb) of the southern Melville Peninsula, Nunavut, lies within the Rae craton and exposes a large (50,000 km2) area of middle to lower crust. The block is composed of ca. 2.86 Ga and 2.73–2.71 Ga tonalite-trondhjemite-granodiorite (TTG) and granitic gneiss that was derived from an older 3.25 and 3.10 Ga crustal substrate. This period of crustal generation was followed by the emplacement of ca. 2.69–2.66 Ga enderbite, charnockite, and granitoid intrusions with entrained websterite xenoliths. These voluminous batholith-scale bodies (dehydrated and hydrated intrusions

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11

Peiffert, Chantal, and Michel Cuney. "Application des tests de lixiviation (NF X31-210) à des roches granitiques." Déchets, sciences et techniques, no. 02 (1996). http://dx.doi.org/10.4267/dechets-sciences-techniques.619.

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12

Joseph, Brou Koffi, Kouamelan Alain Nicaise, Kouassi Brice Roland, and Coulibaly Yacouba. "Pétrographie et géochimie des granitoïdes d’Issia (Centre-Ouest de la Côte d’Ivoire)." European Scientific Journal ESJ 17, no. 17 (2021). http://dx.doi.org/10.19044/esj.2021.v17n17p287.

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Les granitoïdes de la partie Sud du batholite de Ferkessédougou s’étendent ou couvrent la région d’Issia où ils sont représentés par une série de roches allant des granites à deux micas à biotite dominante aux granites à deux micas à muscovite dominante. Cette étude rapporte de nouveaux résultats pétrographiques et géochimiques des granites de la région d’Issia. Sur le plan pétrographique, ils se répartissent en trois séries granitiques à savoir les granites G1, G2 et G3. Les granites G1 sont caractérisés par une abondance de la biotite par rapport à la muscovite et ont subi une migmatisation.

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13

Kerr, Andrew. "Long Walks, Lost Documents and the Birthplace of Igneous Petrology: Exploring Glen Tilt, Perthshire, Scotland." Geoscience Canada, July 10, 2020, 83–102. http://dx.doi.org/10.12789/geocanj.2020.47.159.

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The spectacular angular unconformity at Siccar Point is the most famous site associated with James Hutton (1726–1797), but it was not his only place of insight. In 1785, three years before he discovered Siccar Point, Hutton examined outcrops in the still-remote valley of Glen Tilt, in the Scottish Highlands. He documented contact relationships between Precambrian metasedimentary rocks and Paleozoic granite bodies, although he had no knowledge of their true ages. Near to the hunting lodge where he and his colleague John Clerk of Eldin stayed, veins of granite clearly cut through relict bedding

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14

Murphy, J. Brendan, R. Damian Nance, Logan B. Gabler, Alexandra Martell, and Douglas A. Archibald. "Age, Geochemistry and Origin of the Ardara Appinite Plutons, Northwest Donegal, Ireland." Geoscience Canada, March 29, 2019, 31–48. http://dx.doi.org/10.12789/geocanj.2019.46.144.

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In northwest Donegal, Ireland, a large number of coeval appinitic (hornblende-plagioclase-rich) plutons and lamprophyre dykes occur around the Ardara pluton, a granitic satellite body and one of the oldest phases of the ca. 428–400 Ma composite Donegal Batholith. The appinite units form a bimodal (mafic–felsic) suite in which hornblende is the dominant mafic mineral and typically occurs as large prismatic phenocrysts within a finer grained matrix. Lamprophyre dykes are mafic in composition with a geochemistry that is very similar to that of the mafic appinite bodies. Both mafic rocks are subal

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15

Karlstrom, Karl, and Laura Crossey. "Classic Rock Tours 3. Grand Canyon Geology, One Hundred and Fifty Years after John Wesley Powell: A Geology Guide for Visiting the South Rim of Grand Canyon National Park." Geoscience Canada, December 18, 2019, 163–93. http://dx.doi.org/10.12789/geocanj.2019.46.153.

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The year 2019 is the 150th anniversary of John Wesley Powell’s epic exploration of the Colorado River through Grand Canyon and the 100th anniversary of the establishment of Grand Canyon National Park. This is an excellent moment to look back 150 years to think about where we have come from as a science and society, and look forward 100 years towards the accelerated change we expect in the future. For historians, archaeologists, geologists and astronomers, of course, this century-long time scale is short compared to other perspectives. They might choose also to celebrate the 479th anniversary o

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