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Journal articles on the topic 'Roches volcaniques'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 March 2025

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1

Flehoc, Christine, Nelly Toulhoat, and Benoît Villemant. "Répartition de l'uranium dans les roches volcaniques." Bulletin de Minéralogie 110, no. 2 (1987): 335–44. http://dx.doi.org/10.3406/bulmi.1987.7989.

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2

Rakotondrafara, Hobiniaina, Dimbimalala Ratsarahasina, Zoé Ravaorinirina, Louisette Rasoloniaina, Seta Randriamampionona, and Jean de Dieu Ramaroson. "Des Granules Des Roches Volcaniques Combines Avec Du Compost Pour L’Amélioration De La Production Agricole A Madagascar." International Journal of Progressive Sciences and Technologies 38, no. 1 (2023): 51. http://dx.doi.org/10.52155/ijpsat.v38.1.5205.

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46,5% des sols à Madagascar sont des sols ferralitiques, pauvres en éléments fertilisants ce qui nécessitent l’apport d’amendement fertilisant volcaniques de la région d’Itasy, réputés fertiles pour améliorer leur fertilité et leur rendement agricole. Or les poudres volcaniques combinées avec des matières organiques sont volatiles, facilement lessivées et néfastes pour la santé des agriculteurs. Ainsi, nous avons fait une étude de la granulation de ces poudres volcaniques pour la réduction de la pollution, l’hygiène de travail, l’amélioration de la condition de transport et la santé des utilis

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3

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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4

Shellnutt, J. Gregory. "Igneous Rock Associations 21. The Early Permian Panjal Traps of the Western Himalaya." Geoscience Canada 43, no. 4 (2016): 251. http://dx.doi.org/10.12789/geocanj.2016.43.104.

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The Early Permian (290 Ma) Panjal Traps are the largest contiguous outcropping of volcanic rocks associated with the Himalayan Magmatic Province (HMP). The eruptions of HMP-related lava were contemporaneous with the initial break-up of Pangea. The Panjal Traps are primarily basalt but volumetrically minor intermediate and felsic volcanic rocks also occur. The basaltic rocks range in composition from continental tholeiite to ocean-floor basalt and nearly all have experienced, to varying extent, crustal contamination. Uncontaminated basaltic rocks have Sr–Nd isotopes similar to a chondritic sour

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5

Hamlaoui, H., R. Laouar, S. Bouhlel, and A. J. Boyce. "Caractéristiques pétrologiques et géochimiques des roches magmatiques d’El Aouana, NE algérien." Estudios Geológicos 76, no. 1 (2020): 124. http://dx.doi.org/10.3989/egeol.43391.510.

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[fr] Les roches ignées du massif d’El Aouana font partie de la chaîne magmatique miocène des Maghrébides qui s’étend du nord de la Tunisie jusqu’au Maroc. Ces roches sont composées de faciès volcaniques (andésites et dacites) et subvolcaniques (microdiorites et microgranodiorites), qui ont été mis en place au sein des flyschs crétacés, oligo-miocènes et sédiments miocènes post-nappes. Les andésites sont composées de phénocristaux de plagioclase, d’amphibole et de pyroxène dans une mésostase microlithique. Les dacites sont plus riches en plagioclase avec de rare minéraux ferromagnésiens souvent

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6

Ross, Pierre-Simon, and Patrick Mercier-Langevin. "Igneous Rock Associations 14. The Volcanic Setting of VMS and SMS Deposits: A Review." Geoscience Canada 41, no. 3 (2014): 365. http://dx.doi.org/10.12789/geocanj.2014.41.045.

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Volcanogenic massive sulphide (VMS) deposits and seafloor massive sulphide (SMS) deposits have a spatial and genetic connection with contemporaneous volcanism. The control exerted by the volcanic succession (e.g. rock type, architecture and facies) on the nature and style of the ore and alteration (e.g. subsea-floor replacement vs. exhalative, or discordant vs. conformable) is significant, making it imperative to understand the local volcanology in developing better genetic and exploration models. Three VMS deposit groupings collectively represent a high proportion of cases: (1) deposits assoc

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7

Pugnière, François. "Collecter, ordonner, comparer : les collections minéralogiques de Jean-François Séguier." Dix-huitième siècle 56, no. 1 (2024): 205–18. http://dx.doi.org/10.3917/dhs.056.0205.

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Si les collections minéralogiques rassemblées par Séguier n’ont rien d’exceptionnel, ni d’a priori singulières, elles n’en tinrent pas moins un rôle important dans sa carrière savante, reflétant les inflexions de ses centres d’intérêt. D’abord au service de l’étude des fossiles, en tant qu’outil de référence, elles alimentèrent ultérieurement ses recherches sur la nature des roches volcaniques. Séguier, se défiant des systèmes, eut toujours tendance à privilégier l’observation, reposant sur la description méthodique de l’objet et sur « l’histoire de tous les livres ». C’est peu à peu que les s

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8

Lacroix, Par A. "Les Pegmatitoides Des Roches Volcaniques a Facies Basaltique. A Propos De Celles Du Wei-tchang." Bulletin of the Geological Society of China 8, no. 1 (2009): 45–49. http://dx.doi.org/10.1111/j.1755-6724.1929.mp8001005.x.

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9

Santos, Erico Albuquerque dos, Luana Moreira Florisbal, Arcângelo Loss, Marcell Leonard Besser, and Denilson Dortzbach. "Geology and Wine 15. Producing Wine at Altitude: The Terroir of São Joaquim, Brazil." Geoscience Canada 45, no. 3-4 (2019): 137–49. http://dx.doi.org/10.12789/geocanj.2018.45.139.

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The municipality of São Joaquim, located in the Planalto Catarinense viticultural region, is the coldest wine-growing region of Brazil, and contains the highest-altitude vineyards in the country. These vineyards were established within the last 20 years, so this is a young and still-developing viticultural region. Information on the terroir of São Joaquim is needed in order to identify potential vineyard sites and to help improve the viticulture in the region. This work aims to characterize the terroir of São Joaquim, where wines are produced from grapes cultivated above 900 m of altitude, thr

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10

Bellon, Hervé, Louis Chauris, Bernard Hallégouët, and Pierre Thonon. "Age et origine de roches volcaniques observées sur les estrans de l'extrême ouest du massif armoricain (France)." Norois 139, no. 1 (1988): 331–35. http://dx.doi.org/10.3406/noroi.1988.7631.

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11

Picard, Christian, and Michel Piboule. "Pétrologie des roches volcaniques du sillon de roches vertes archéennes de Matagami – Chibougamau à l'ouest de Chapais (Abitibi est, Québec).1. Le groupe basal de Roy." Canadian Journal of Earth Sciences 23, no. 4 (1986): 561–78. http://dx.doi.org/10.1139/e86-056.

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In the northeastern part of the Abitibi orogenic belt, the Archean Matagami–Chibougamou greenstone belt (2700 Ma) includes a basal volcanic sequence named the Roy Group, unconformably overlain by a volcano-sedimentary series called the Opemisca Group.The Roy Group, to the west of the town of Chapais, consists of a thick, stratified, and polycyclic volcanic series (thickness = 11 000 m) resembling the large, western Abitibi submarine stratovolcanoes constructed by three mafic to felsic magmatic cycles. The first cycle (Chrissie Formation) shows lateral spreading and is composed only of a meta-a

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12

Picard, Christian, and Michel Piboule. "Pétrologie des roches volcaniques de sillon de roches vertes archéennes de Matagami–Chibougamau à l'ouest de Chapais (Abitibi est, Québec), 2. Le groupe hautement potassique d'Opémisca." Canadian Journal of Earth Sciences 23, no. 8 (1986): 1169–89. http://dx.doi.org/10.1139/e86-115.

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In the western part of the Chapais syncline (Abitibi East, Quebec), the Opemisca Group unconformably overlies the Roy Group at a low angle. It consists of a thick turbidite sequence covered by an interdigitated sequence of lavas and alluvial cone sediments. The subaerial lavas include two sequences evolving from porphyric metabasalts to metatrachyandesites and porphyric metatrachytes (lower sequence) or to K-rich aphanitic meta-andesites (upper sequence). These lavas, with calc-alkaline to shoshonitic affinity, have high K2O, Ba, Sr, and Th contents and show highly enriched LREE spectra.The be

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13

Schoonmaker, Adam, William S. F. Kidd, Stephen E. DeLong, and John F. Bender. "Lawrence Head Volcanics and Dunnage Mélange, Newfoundland Appalachians: Origin by Ordovician Ridge Subduction or in Back-Arc Rift?" Geoscience Canada 41, no. 4 (2014): 523. http://dx.doi.org/10.12789/geocanj.2014.41.053.

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This paper reviews the geological setting and reports new geochemical trace element data from the Ordovician Lawrence Head Volcanics (LHV) and the underlying gabbro sills in the Exploits Group. In combination with existing published analyses and ages of these rocks, the volcanic rocks and sills are indistinguishable in composition and age, and the data are consistent with the hypothesis that they represent the same (mostly E-MORB composition) magmatic event in the early–mid Darriwilian (~465 ± 2 Ma). The LHV and their enclosing strata show regional evidence for: 1) upward decline of volume and

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14

Lefèvre, Jean-Claude, and Pierre-Yves Gillot. "Datation potassium-argon de roches volcaniques du Pléistocène supérieur et de l'Holocène : exemple de l'Italie du sud ; application à l'archéologie." Bulletin de la Société préhistorique française 91, no. 2 (1994): 145–48. http://dx.doi.org/10.3406/bspf.1994.9727.

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15

Hughes, K. Stephen, James P. Hibbard, Jeffrey C. Pollock, David J. Lewis, and Brent V. Miller. "Detrital Zircon Geochronology Across the Chopawamsic Fault, Western Piedmont of North-Central Virginia: Implications for the Main Iapetan Suture in the Southern Appalachian Orogen." Geoscience Canada 41, no. 4 (2014): 503. http://dx.doi.org/10.12789/geocanj.2014.41.052.

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The Chopawamsic fault potentially represents the main Iapetan suture, previously unidentified in the southern extent of the Appalachian orogen. The fault trends through the north-central portion of the western Piedmont of Virginia and separates the composite metaclastic Potomac terrane, commonly interpreted to be of Laurentian affinity, from the Chopawamsic terrane, the remains of a Middle Ordovician volcanic arc of uncertain crustal affinity. To gain insight on the first-order orogenic significance of the Chopawamsic fault, we report the results of LA–ICP–MS U–Pb analyses of 1,289 detrital zi

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16

Villemaire, Cl. "Les amas sulfurés du massif miocène d'El Aouana (Algérie)— I. Dynamisme de mise en place des roches volcaniques et implications métallogéniques." Journal of African Earth Sciences (and the Middle East) 7, no. 1 (1988): 133–48. http://dx.doi.org/10.1016/0899-5362(88)90060-7.

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17

Beurrier, M., M. Ohnenstetter, B. Cabanis, J. L. Lescuyer, M. Tegyey, and J. Le Metour. "Geochimie des filons doleritiques et des roches volcaniques ophiolitiques de la nappe de Semail; contraintes sur leur origine geotectonique au Cretace superieur." Bulletin de la Société Géologique de France V, no. 2 (1989): 205–19. http://dx.doi.org/10.2113/gssgfbull.v.2.205.

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18

Hildebrand, Robert S., and Joseph B. Whalen. "Arc and Slab-Failure Magmatism in Cordilleran Batholiths II – The Cretaceous Peninsular Ranges Batholith of Southern and Baja California." Geoscience Canada 41, no. 4 (2014): 399. http://dx.doi.org/10.12789/geocanj.2014.41.059.

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Ever since the late 1960s when Warren Hamilton proposed that the great Cordilleran batholiths of the western Americas are the roots of volcanic arcs like the Andes and were generated by longstanding eastward subduction, most geologists have followed suit, despite the evergrowing recognition that many Cordilleran batholiths are complex, composite bodies that developed with intervals of intense shortening and exhumation between and during periods of magmatism. The Peninsular Ranges batholith of Southern and Baja California provides a superb place to unravel the complexities because there is a lo

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19

D'Arco, Philippe, and Joseph Cotten. "Etude des rapports Fe3+/Fe2+ et OH-/F-, des éléments-traces dans les amphiboles des roches volcaniques des Petites Antilles ; estimation de fHF/fH2O." Bulletin de Minéralogie 108, no. 2 (1985): 153–59. http://dx.doi.org/10.3406/bulmi.1985.7865.

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20

Nicoud, Élisa. "Les chaînes opératoires sur galets en roches volcaniques et quartz dans l’industrie lithique du gisement Moustérien de champ grand (Saint-Maurice-sur-Loire, Loire)." Paléo, Numéro spécial (December 31, 2010): 107–22. http://dx.doi.org/10.4000/paleo.1937.

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21

Fyffe, Leslie R. "The Grand Manan Terrane of New Brunswick: Tectonostratigraphy and Relationship to the Gondwanan Margin of the Iapetus Ocean." Geoscience Canada 41, no. 4 (2014): 483. http://dx.doi.org/10.12789/geocanj.2014.41.051.

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Recently gathered stratigraphic and U–Pb geochronological data indicate that the pre-Triassic rocks of the Grand Manan Terrane on the eastern side of Grand Manan Island can be divided into: (1) Middle Neoproterozoic (late Cryogenian) quartzose and carbonate sedimentary sequences (The Thoroughfare and Kent Island formations); (2) a Late Neoproterozoic (early Ediacaran) volcanic-arc sequence (Ingalls Head Formation); and (3) Late Neoproterozioc (mid- Ediacaran) to earliest Cambrian (early Terreneuvian) sedimentary and volcanic-arc sequences (Great Duck Island, Flagg Cove, Ross Island, North Head

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22

Locat, Jacques, and Guy Lefebvre. "Étude de la formation des sédiments fins glacio-lacustres du lac Barlow-Ojibway : le site d’Olga, Matagami, Québec." Géographie physique et Quaternaire 35, no. 1 (2011): 93–103. http://dx.doi.org/10.7202/1000381ar.

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Le site choisi est situé à moins de 10 km au nord-est de Matagami, Québec, sur le Territoire de la Baie-James. Cet article résume les principales informations géologiques obtenues et insiste sur l’analyse détaillée des sédiments fins. Au site de la digue d’essai d’Olga, le dépôt est constitué, à la base, d’un complexe de till et de sable et gravier fluvio-glaciaires, d’un dépôt glacio-lacustre et lacustre comprenant une zone altérée au sommet recouvert d’une couche de matière organique. Le tout repose sur des roches métamorphiques et volcaniques de la province du Supérieur. Les sédiments fins

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23

Jagercikova, Marianna, Ludovic Mocochain, Anne-elisabeth Lebatard, et al. "Découverte et étude de remplissages karstiques allochtones d’âge miocène dans l’Obiou (Dévoluy, Alpes françaises) Implications géomorphologiques et paléogéographiques." Karstologia : revue de karstologie et de spéléologie physique 77, no. 1 (2021): 49–62. https://doi.org/10.3406/karst.2021.3251.

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Sur les flancs de l’Obiou (2789 m) dans le massif du Dévoluy (Hautes-Alpes et Isère, France), une découverte fortuite a été réalisée : celle de galets cristallins affleurant, depuis un terrier de marmottes, au beau milieu d’un éboulis calcaire. La prospection de plusieurs cavités environnantes a mis au jour la présence d’alluvions cristallins allochtones sous forme de conglomérats, sables et argiles constituant une série de remplissages endokarstiques. Du point de vue pétrographique, le spectre compte notamment des granites, orthogneiss, gneiss divers, migmatites, gneiss amphiboliques, roches

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24

Soulat, Patrick, Stephen Bonnet, Mathieu Le Floch, et al. "L’utilisation de sols résiduels tropicaux dans la construction du barrage de Moreau (Guadeloupe)." Revue Française de Géotechnique, no. 160 (2019): 3. http://dx.doi.org/10.1051/geotech/2019015.

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Le barrage de Moreau est un barrage en remblai actuellement en construction sur la commune de Goyave en Guadeloupe. Le barrage est fondé sur des roches résiduelles d’origine volcanique. Ces roches se sont formées sur place par altération in situ, c’est-à-dire sans transport. Cette altération, qui pénètre profondément dans la roche, est accélérée par la pluie et la température. L’altération produit des matériaux argileux en passant, à des stades d’altération intermédiaires, par des matériaux aux caractéristiques et aux comportements inhabituels, en particulier l’allophane, l’halloysite et la ka

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25

Van Staal, Cees R., Alexandre Zagorevski, Vicki J. McNicoll, and Neil Rogers. "Time-Transgressive Salinic and Acadian Orogenesis, Magmatism and Old Red Sandstone Sedimentation in Newfoundland." Geoscience Canada 41, no. 2 (2014): 138. http://dx.doi.org/10.12789/geocanj.2014.41.031.

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We propose an intimate relationship between Silurian terrestrial red bed sedimentation (Old Red Sandstone), slab breakoff-related magmatism and deformation in the Newfoundland Appalachians. Red bed sedimentation started during the Early Silurian, and records the progressive rise of the Salinic mountains in the tectonic hinterland of the orogen. The red beds were mainly deposited in molasse-style foreland basins in front of an east-propagating terminal Salinic deformation front. New U–Pb zircon dating of volcanic rocks interlayered with the Silurian red beds in key structural locations yielded

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26

Schoonmaker, Adam, William S. F. Kidd, and Tristan Ashcroft. "Magmatism and Extension in the Foreland and Near-Trench Region of Collisional and Convergent Tectonic Systems." Geoscience Canada 43, no. 3 (2016): 159. http://dx.doi.org/10.12789/geocanj.2016.43.100.

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Foreland magmatism occurs in the lower plate during arc–continent or continent–continent collision, although it is uncommon. Ancient examples are recognized by a stratigraphic section into which mafic lavas and/or shallow sills are emplaced at a level at the top of a passive margin cover sequence, or within the overlying deeper water deposits that include mudrocks and flysch-type turbidites. Extensional structures associated with the emplacement of the volcanic rocks may develop slightly prior to or contemporaneous with the arrival of the approaching thrust front. We have selected twelve examp

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27

Hildebrand, Robert S., and Joseph B. Whalen. "Arc and Slab-Failure Magmatism in Cordilleran Batholiths I – The Cretaceous Coastal Batholith of Peru and its Role in South American Orogenesis and Hemispheric Subduction Flip." Geoscience Canada 41, no. 3 (2014): 255. http://dx.doi.org/10.12789/geocanj.2014.41.047.

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We examined the temporal and spatial relations of rock units within the Western Cordillera of Peru where two Cretaceous basins, the Huarmey-Cañete and the West Peruvian Trough, were considered by previous workers to represent western and eastern parts respectively of the same marginal basin. The Huarmey-Cañete Trough, which sits on Mesoproterozoic basement of the Arequipa block, was filled with up to 9 km of Tithonian to Albian tholeiitic–calc-alkaline volcanic and volcaniclastic rocks. It shoaled to subaerial eastward. At 105–101 Ma the rocks were tightly folded and intruded during and just a

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28

Bodéré, Jean-Claude. "Le rôle des influences structurales sur le tracé d’une côte rocheuse volcanique : l’exemple des strandflats du sud-est de l’Islande." Géographie physique et Quaternaire 35, no. 2 (2011): 231–40. http://dx.doi.org/10.7202/1000439ar.

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Le tracé des côtes rocheuses des fjords islandais de l’est et du sud-est, entre le Reydarfjördur et l’Álftafjördur, est étudié. Les failles sont rares et n’ont aucune influence notable sur le tracé d’ensemble de ce littoral. En revanche, dans le détail, se dessinent de multiples pointes rocheuses, parallèles entre elles et dissymétriques. D’origine structurale, elles résultent essentiellement de l’action de l’érosion marine différentielle. Les trapps s’inclinent vers l’ouest (6 à 10° au niveau de la mer) et le strandflat recoupe les horizons basaltiques. Les plus résistants (tholéites à olivin

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29

Bracco, Jean-Pierre. "Colonisation et peuplement en moyenne montagne volcanique au Würm récent : le campement badegoulien de la Roche à Tavernat (Massif Central)." Bulletin de la Société préhistorique française 91, no. 2 (1994): 113–18. http://dx.doi.org/10.3406/bspf.1994.9722.

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30

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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31

McCutcheon, Steven R., and James A. Walker. "Great Mining Camps of Canada 7. The Bathurst Mining Camp, New Brunswick, Part 1: Geology and Exploration History." Geoscience Canada, October 31, 2019, 137–54. http://dx.doi.org/10.12789/geocanj.2019.46.150.

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The Bathurst Mining Camp of northern New Brunswick is approximately 3800 km2 in area, encompassed by a circle of radius 35 km. It is known worldwide for its volcanogenic massive sulphide deposits, especially for the Brunswick No. 12 Mine, which was in production from 1964 to 2013. The camp was born in October of 1952, with the discovery of the Brunswick No. 6 deposit, and this sparked a staking rush with more hectares claimed in the province than at any time since. In 1952, little was known about the geology of the Bathurst Mining Camp or the depositional settings of its mineral deposits, beca

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32

Ben Aissi, L., A. El Boukhari, M. Hibti, M. Elharfi, L. Maacha, and Y. Zinbi. Estudios Geológicos 61, no. 3-6 (2005). http://dx.doi.org/10.3989/egeol.05613-652.

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33

Oliveros, Veronica, Pablo Moreno-Yaeger, and Laura Flores. "Igneous Rock Associations 25. Pre-Pliocene Andean Magmatism in Chile." Geoscience Canada, July 10, 2020, 65–82. http://dx.doi.org/10.12789/geocanj.2020.47.158.

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Andean-type magmatism and the term ‘andesite’ are often used as the norm for the results of subduction of oceanic lithosphere under a continent, and the typical rock formed. Although the Andes chain occupies the whole western margin of South America, the most comprehensively studied rocks occur in the present-day Chilean territory and are the focus of this paper. Andean magmatism in this region developed from the Rhaetian-Hettangian boundary (ca. 200 Ma) to the present and represents the activity of a long-lived continental magmatic arc. This paper discusses Pre-Pleistocene volcanic, plutonic,

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