| | Journal (article/letter/editorial) | STUDIES OF WATERS IN A GEOTHERMAL AREA: THE CANTAL, FRANCE A. STETTLER * and C.J. ALLEGRE Laboratoire...geothermal waters from the Cantal volcanic area in the MassifCentral, France. A comparison with appropriate...basement, lacustrian sediments underlying the volcano, Miocene-Pliocene volcanic rocks of basaltic to...this purpose we embarked in a study of the Cantal area in France, a volcanic system for which a geothermal...thermo-mineral waters in the volcanic province Cantal: DM36-39 = north of Murat, DM70-73 = Puy Gros, | | | Report (chapter) | and Quaternary volcanism in the Massif Central, France Hilary Downes S U M M A R Y : Continental alkaline...Deves) and two central volcanoes (Mont-Dore and Cantal). Maars and diatremes are common, indicating interaction...Oligocene graben system. Subsequently the central volcano Cantal (112.5 Ma) and the plateau-forming fissure...Escandorgue and the eruption of the second central volcano Mont-Dore. The youngest activity (Recent) is in...University Library on June 7, 2015 Massif Central, France Bourgogne 519 - Charollais Menat Sioule Ch | | | Journal (article/letter/editorial) | GENESIS AND EVOLUTION OF THE CANTAL CONTINENTAL VOLCANIC SYSTEM (FRANCE) A. STETTLER 1 and C.J. ALLI~GRE...UniversitOs de Paris 6- 7, 2 Place Jussieu, Paris 5 (France) Received December 12, 1978 Revised version accepted...five different rock types from the Cantal shield volcano in France, applying high-precision Rb-Sr techniques...ages of volcanic rocks from the center of the Cantal volcano. 1. Introduction The genesis of continental...present study we decided to work on the Cantal shield volcano whose suite of rocks covers a range from | | | Journal (article/letter/editorial) | undersaturated alkaline volcanics, Cantal, Massif Central, France H. DOWNES Department of Geology, Birkbeck...mixing in the Puy Griou/Griounot area of the Cantal volcano (10 3 Ma). Petrographic evidence for injection...KEYWORDS:magma mixing, alkaline volcanics, Massif Central, France. Introduction IT is now widely accepted that magma...dominated by two late Tertiary central volcanoes, Cantal (10-3 Ma) and Mont Dore (2.5-0.25 Ma). In these...rhyolite magmas are well-known from the Mont Dore volcano and the Chaine des Puys. It is considered that | | | Journal (article/letter/editorial) | trends of pyroxenes from agpaitic phonolites (Cantal, France) R. BROUSSE Laboratoirc de P&rographic-Volcanologie...P&rographic-Volcanologie, Universit~ Paris XI, 91405 Orsay, France AND J. PH. RANQON B u r e a u d e R e c h e r...compositions of four agpaitic phonolites from the Cantal Volcano (France) have been studied. The pyroxenes from...Auteroche, in the north-western area of the Cantal Volcano (geological map: Riom-esMontagncs 1/50000,...of the Cantal stratovolcano. Copyright the Mineralogical Society Orl6ans C6dex, France Cantal agpaitic | | | Journal (article/letter/editorial) | GEOTHERMAL WATER-ROCK ASSOCIATION IN THE MASSIF CENTRAL, FRANCE A. STETTLER 1 Laboratoire G~ochimie Cosmochimie...de la Terre, Universit~s de Paris 6-7, Paris 5 (France) Received October 1976 Revised version received...thermo-mineral waters from the Massif Central in France. Rocks and mineral fractions which are thought...MargueriteSt. Nectaire (Group B) in the Massif Central, France, were analyzed and compared with suitable wholerock...respectively. After sawing and crushing, the plagioclase, K-feldspar and biotite fractions were handpicked | | | Journal (article/letter/editorial) | AND PRE-HERCYNIAN ORTHOGNEISSES, MASSIF CENTRAL (FRANCE) HILARY DOWNES and JEAN-LOUIS DUTHOU Department...de Clermont II, F-63038 Clermont Ferrand C6dex (France) (Accepted for publication December 29, 1987) ...and pre-Hercynian orthogneisses, Massif Central (France). Chem. Geol., 68: 291-308. The Cadomian-Hercynianbasement...Cadomian-Hercynianbasement of the Massif Central, France, contains both pre-metamorphic orthogneisses (600-410 Ma)...from the Hercynian basement of the Massif Central, France. The nature of the present-day lower crust of the | | Kizovski, T.V., Izawa, M.R.M., Tait, K.T., Moser, D.E., Day, J.M.D., Hyde, B.C., White, L.F., Kovarik, L., Taylor, S.D., Perea, D.E., Barker, I.R., Joy, B.R. (2020) Petrogenesis, alteration, and shock history of intermediate shergottite Northwest Africa 7042: Evidence for hydrous magmatism on Mars?. Geochimica et Cosmochimica Acta, 283. 103-123 doi:10.1016/j.gca.2020.05.030 | Journal (article/letter/editorial) | terrestrial basalt standards (Basalt Hawaiian Volcano Observatory (BHVO)-2, and Basalt 228 Columbia...clinopyroxene, with interstitial optically isotropic plagioclase laths (maskelynite glass), 240 accessory Mg-rich...within the interstices 310 between the (former) plagioclase laths. The maskelynite is free of vesicles and...appears to retain the shape of the pre-shocked plagioclase. Local patches 312 of mesostasis are also commonly...(Shearer et al., 2015), reflecting the role of plagioclase crystallization prior to merrillite. 320 321 | | | Report (volume) | and Quaternary volcanism in the Massif Central, France 517 KOGARKO, L. N. Alkaline rocks of the eastern...transitional basalts, and these typically form major volcano complexes and have associated felsic magmas. Such...sources Peridotites containing minor amounts of plagioclase, trachytes containing peridotite nodules, and...of amphibole, alkali felspars and soda-rich plagioclase; near-solidus volatile accumulation could then...geology, petrology and geochemistry of Caldeira volcano, Graciosa, Azores, and its bearing on contemporaneous | | | Book | observations (e.g. ‘a rock consisting of abundant plagioclase and hornblende phenocrysts set in a finegrained...intermediate plagioclase + augite + opaques’) into an informative, appropriate name (‘plagioclase-hornblende-phyric...determining the appropriate root name Calcic plagioclase in basalt Type mineral – A non-essential mineral...Mineralogical Society of America (Fig. 6.6), Montserrat Volcano Observatory (Fig. 7.4a and the front cover image)...previously erupted products the hazard presented by a volcano to surrounding communities; • investigating magma | | | Book | indicated) Front page of cover: Overview of the Ruapehu volcano in the Central North Island of New Zealand. Tama...New Zealand. Lower: Overview of the Mt Ngauruhoe volcano from the north, Taupo Volcanic Zone, New Zealand...microlites (small crystals, typically lath-shaped plagioclase). The relative proportion of tachylite and sideromelane...volcanic rocks from previous eruptions of the same volcano (Plate II, 2). In the CAS and WRIGHT (1987) terminology...pyroclastic flows inferred from ignimbrite at Lascar Volcano, Chile. — Journal of Volcanology and Geothermal | | | Book (edition) | Typhon is buried under Etna volcano. Whenever the giant stirs, the volcano erupts violently. Eighteenth...Science, New Zealand Stephen R. McNutt Alaska Volcano Observatory and University of Alaska Fairbanks...Hazard from Lahars and Jökulhlaups Synthesis of Volcano Monitoring 973 1121 John B. Murray, Hazel Rymer...McNutt Impacts of Eruptions on Human Health Volcano Warnings Volcanic Crises Management Peter J. Baxter...Related Phreatomagmatic Eruptions Synthesis of Volcano Monitoring 495 1165 Volcanic Lakes Volcanic Materials |
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