 | | Journal (article/letter/editorial) | | Hydrothermal System of Furnas Volcano, São Miguel Island, The Azores Archipelago Iuliu Bobos 1, * and Celso...Hydrothermal System of Furnas Volcano, São Miguel Island, The Azores Archipelago. Minerals ICTerra, DGAOT...Porto, Rua do Campo Alegre 687, 4168-007 Porto, Portugal Geobiotec, Departamento de Geociências, Universidade...Universidade de Aveiro, 3810-193 Aveiro, Portugal; cgomes@ua.pt Correspondence: ibobos@fc.up.pt Abstract:...high-field strength and rare earth elements; São Miguel island; Azores archipelago Academic Editor: Monica Piochi |  | | Report (volume) | | Three Late Quaternary Stratovolcanoes on Sao Miguel, Azores U.S. GEOLOGICAL SURVEY BULLETIN 1900 Prepared...cooperation with the Regional Government of the Azores AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL...Three Late Quaternary Stratovolcanoes on Sao Miguel, Azores By RICHARD B. MOORE Prepared in cooperation...cooperation with the Regional Government of the Azores U.S. GEOLOGICAL SURVEY BULLETIN 1900 U.S. DEPARTMENT...three late Quaternary stratovolcanoes on Sao Miguel, Azores I by Richard B. Moore. p. em. (U.S. Geological |  | Snyder, Darin C., Widom, Elisabeth, Pietruszka, Aaron J., Carlson, Richard W., Schmincke, Hans-Ulrich (2007) Time scales of formation of zoned magma chambers: U-series disequilibria in the Fogo A and 1563 A.D. trachyte deposits, São Miguel, Azores. Chemical Geology, 239 (1) 138-155 doi:10.1016/j.chemgeo.2007.01.002 | Journal (article/letter/editorial) | | the Fogo A and 1563 A.D. trachyte deposits, São Miguel, Azores Darin C. Snyder a,⁎, Elisabeth Widom a ,...zoned trachyte deposits from Fogo volcano, São Miguel, Azores. High-precision U-series disequilibria measurements...multicollector mass spectrometry were performed on pumice lapilli and volcanic glass separates from Fogo...disequilibria; Time scales; Magma chamber; Trachyte; Azores ⁎ Corresponding author. 254 Williamsburg Circle...magmatic systems. Fogo volcano on the island of São Miguel (Azores) has repeatedly erupted strongly compositionally |  | | Journal (article/letter/editorial) | | Investigation of the Fogo A Trachyte Deposit, São Miguel, Azores DARIN C. SNYDER1*, ELISABETH WIDOM1, AARON...chemically zoned trachyte pumice deposit of the Fogo A eruption, Fogo volcano, Azores. Sr isotopic variation...is observed in whole rocks, glass separates and sanidine phenocrysts (whole-rock 87 Sr/86 Sr: 07049---07061;...07049---07061; glass 87 Sr/86 Sr: 07048---07052; sanidine 87 Sr/86 Sr: 07048--07062). Thorium isotopic...pre-eruptive magmatic processes are being investigated. Azores; open-system processes; Sr isotopes; trachytic |  | | Report (chapter) | | Chapter 8 Eruptive history of Fogo Volcano, São Miguel, Azores N. WALLENSTEIN1*, A. DUNCAN2,3, J. E. GUEST4†...Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal 2 Institute of Biological, Environmental Science...largest of the three active central volcanoes on São Miguel and dominates the centre of the island. It is located...where considerable subsidence within the NW–SE Ribeira Grande graben has occurred. A more complete stratigraphy...trachytic Plinian eruptions, including those of the Ribeira Chã (8– 12 ka BP) and Fogo A (4.6 ka BP). The |  | | Journal (article/letter/editorial) | | of a chemically zoned trachyte: Fogo A, Sao Miguel, Azores E. Widom 1 *, H.-U. Schmincke 2, and J.B. GilP...paths. Major and trace element variations in 25 pumice samples collected from throughout the stratigraphic...Fig. 1. Locality map of the Azores platform with the island of Sao Miguel. The inset is a more detailed...detailed drawing of Sao Miguel showing the location of Agua de Pao volcano H i l d r e t h 1983 ; W 6 r n...setting The island of Sao Miguel lies near the eastern extent of the Azores platform, a topographic high |  | Jeffery, A. J., Gertisser, R., O’Driscoll, B., Pacheco, J. M., Whitley, S., Pimentel, A., Self, S. (2016) Temporal evolution of a post-caldera, mildly peralkaline magmatic system: Furnas volcano, São Miguel, Azores. Contributions to Mineralogy and Petrology, 171 (5) doi:10.1007/s00410-016-1235-y | Journal (article/letter/editorial) | | peralkaline magmatic system: Furnas volcano, São Miguel, Azores A. J. Jeffery1 · R. Gertisser1 · B. O’Driscoll2...of three active central volcanoes on São Miguel Island, Azores, and is considered to be one of the most...Geológicos, University of the Azores, 9501‑801 Ponta Delgada, Azores, Portugal 4 Centro de Informação e...Sismovulcânica dos Açores, 9501‑801 Ponta Delgada, Azores, Portugal 5 Department of Earth and Planetary Science...ubiquitous clinopyroxene antecrysts in the UFG pumice falls, provide evidence for mingling/mixing processes |  | de Lima, Evandro Fernandes, Machado, Adriane, Nardi, Lauro Valentim Stoll, Saldanha, Dejanira Luderitz, Azevedo, José Manuel Martins, Sommer, Carlos Augusto, Waichel, Breno Leitão, Chemale, Farid, de Almeida, Delia del Pilar Montecinos (2011) Geochemical evidence concerning sources and petrologic evolution of Faial Island, Central Azores. International Geology Review, 53 (14) 1684-1708 doi:10.1080/00206814.2010.496248 | Journal (article/letter/editorial) | | and petrologic evolution of Faial Island, Central Azores 1938-2839 Geology Review, 0020-6814 TIGR International...Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; bCentro de Geofísica...Geofísica da Universidade de Coimbra-CGUC, Coimbra, Portugal; cUniversidade Estadual do Oeste do Paraná (UNIOESTE)...Prof. José Aloísio de Campos s/n, Jardim Rosa Elze, São Cristóvão-Se, Brazil; e Universidade Federal do Pampa...Volcanic rocks that make up Faial Island, Central Azores, consist of four volcanostratigraphic units, with |  | | Journal (article/letter/editorial) | | plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands) F. RIDOLFI1, A. RENZULLI1,*, P. SANTI1...fall deposits of Agua de Pau volcano (São Miguel, Azores Islands) are divisible into (1) silica-undersaturated...minerals, Agua de Pau, São Miguel, Azores. Introduction T HE Azores archipelago straddles the MidAtlantic...MidAtlantic Ridge and emerges from the Azores Platform, (37 – 40ºN and 25 – 31ºW) near the North American-African-Eurasian...triple plate junction (Burke and Wilson, 1976). São Miguel is one of the eastern islands and is located along |  | | Book | | WORKSHOP W2 – 11th CONGRESS ISRM, PONTA DELGADA, AZORES, PORTUGAL, 14–15 JULY 2007 Volcanic Rocks Editors Ana...Delgada, Azores, Portugal João Carlos Nunes Department of Geosciences, University of Azores, Ponta Delgada...Delgada, Azores, Portugal LONDON / LEIDEN / NEW YORK / PHILADELPHIA / SINGAPORE © 2007 Taylor & Francis...B. Voight & J. Taron Geological hazards at the Azores region J.L. Gaspar, G. Queirós & T. Ferreira 1...del Potro Volcanostratigraphic profiles for the Azores region: A contribution for the EC8 Regulations |  | | Journal (article/letter/editorial) | | Magmatic Activity in Agua de Pao Volcano, Sao Miguel, Azores by E. WIDOM 1 *, J. B. GILL 1 , AND H.-U. SCHMINCKE...trachyte eruptions of Agua de Pao volcano, Sao Miguel, Azores, represent bulk liquid compositions resembling...with open miarolitic cavities and homogeneous sanidine; 011) dense syenite with exsolved alkali feldspar...trachyte eruptions of Agua de Pao volcano (Sao Miguel, Azores) also appear to represent MAGMAT1C ACTIVITY...velocities of residual melt. The Azores island group emerges from the Azores Platform, a topographic high |  | | Report (chapter) | | October 8, 2015 Chapter 5 The magmatism of the Azores islands VITTORIO ZANON Centro de Vulcanologia e...Açores, Portugal (e-mail: Vittorio.VZ.Zanon@azores.gov.pt) Abstract: Magmas in the Azores (Portugal) were...sources with a ubiquitous and slightly depleted Azores mantle. Finally, a contribution of recycled oceanic...in Pb isotope ratios across the island of São Miguel. Primitive melts were generated by 1 –7% partial...chemical heterogeneities in the mantle sources. The Azores, located in the middle of the North Atlantic Ocean |  | | Journal (article/letter/editorial) | | Pyroclastics from Agua de Pau Volcano, Sao Miguel, Azores: Evolution of a Magma Body over 4,000 Years...England Abstract. The Recent stratigraphy of Sao Miguel records large numbers of trachytic pyroclastic...one of the three active stratovolcanoes on Sao Miguel. A geochemical and electron microprobe study made...succession, revealed significant variations in pumice clast chemistry and mineralogy between the individual...deposit. It is proposed that the five air fall pumice deposits represent successive samples of an evolving |  | | Journal (article/letter/editorial) | | Volatile Component of Some Pumice-Forming Alkaline Magmas from the Azores and Canary Islands and M. Storey...alkaline pumice deposits, of airfall and ignimbrite type, from Tenerife (Canary Islands), Sao Miguel and Faial...Faial (Azores). It is argued that reliable temperature and f O z estimates can be obtained from tita...particular interest are the volatile contents of pumice-forming magmas, since their very formation is testimony...determined from information preserved in the final pumice deposit. The most satisfactory method is to analyse |  | | Report (chapter) | | hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores M. Storey, J. A. Wolff, M. J. Norry & G. F...F. Marriner SUMMARY: The island of Sao Miguel in the Azores exhibits bimodal volcanism: eruptives from...fluid pressure may act as a 'trigger' for explosive pumice-forming eruptions (Sparks et al. 1977). Experiments...Blake & Campbell 1986). The island of Sao Miguel in the Azores (Fig. 1) contains an example of this bimodal...volcanological problems. The volcanology of Sao Miguel was the subject of a detailed study by Booth et |  | Noll Filho, Roberto J., Sommer, Carlos A., Lima, Evandro F., Philipp, Ruy P., Basei, Miguel A.S. (2019) High‐silica Ediacaran volcanism in the Dom Feliciano Belt, southernmost Brazil. Geological Journal, 54 (3) 1413-1434 doi:10.1002/gj.3239 | Journal (article/letter/editorial) | | Evandro F. de Lima2 | Ruy P. Philipp2 | 3 Miguel A.S. Basei 1 Programa de Pós‐Graduação em Geociências...Geocronologia (CPGEO), Instituto de Geociências, USP, São Paulo, Brazil Correspondence Roberto J. Noll Filho...noll.robertoj@gmail.com Funding information Rio Grande do Sul State Research Foundation (FAPERGS), Grant/Award...= Sierra Ballena, 9 = Cerro Amaro, 10 = Arroio Grande. Source: Philipp, Jelinek, and Chemale Jr (2012)... exposed from Uruguay to southern Brazil (Rio Grande do Sul and in order to hypothesize about its potential |  | | Journal (article/letter/editorial) | | Geological Society of America Bulletin Two Plinian Pumice-Fall Deposits from Somma-Vesuvius, Italy LUCIO...Plinian Pumice-Fall Deposits from Somma-Vesuvius, Italy maps, namely, 2.6 km 3 for the Pompei Pumice and...and 2.1 km 2 for the Avellino Pumice. ABSTRACT Two of the major pumice-fall deposits of Somma-Vesuvius...Somma-Vesuvius are described. One, the Pompei Pumice, resulted from the classic eruption of A.D. 79, which is taken...type example of a Plinian eruption. The Pompei Pumice is dispersed south and southeast of the volcano |  | | Journal (article/letter/editorial) | | underlying Tenerife (Canary Islands), Sao Miguel and Faial (Azores), and Vesuvius. The most fractionated...system is heavy-REE depleted roofwards, while the Azores systems, which lack these phases, display roofward...Walker & Croasdale (1971, and unpub. data) on the Azores Islands. We now describe the general features of...1980), the units studied are subplinian to plinian pumice fall deposits and ignimbrites, some with associated...Las Canadas is the source of a late Quaternary pumice succession comprising some 40 airfall and ignimbrite |  | de Almeida, Delia del Pilar M., Conceição, Rommulo V., Chemale, Farid, Koester, Edinei, de Borba, André W., Petry, Karla (2005) Evolution of Heterogeneous Mantle in the Acampamento Velho and Rodeio Velho Volcanic Events, Camaquã Basin, Southern Brazil. Gondwana Research, 8 (4) 479-492 doi:10.1016/s1342-937x(05)71150-3 | Journal (article/letter/editorial) | | Sinos (UNISINOS), Av. Unisinos, 950 Cristo Rei, São Leopoldo, CEP 93022-000, RS, Brazil 2 Laboratório...Camaquã Basin are located in south-central Rio Grande do Sul State, southern Brazil. They are part of...platy vitroclasts, and crystaloclasts of quartz, sanidine and plagioclase in a silicified ash matrix. Tuffs...present crystaloclasts of quartz, microperthitic sanidine, anorthoclase, albitized plagioclase and phylossilicates...phylossilicates in a matrix composed of shards and pumice, with eutaxitic texture, concoidal and perlitic |  | | Journal (article/letter/editorial) | | systematically in size away from the source, but pumice clasts have an irregular size distribution. Grain...a few microns in size. Reverse grading of large pumice clasts and normal grading of large lithic clasts...beds, cross-bedded pyroclastic surge deposits and pumice fall deposits formed in the same eruptions. Chemical...the abbreviations MP and ML refer to the maximum pumice clast size and the maximum lithic clast size respectively...ignimbrites. Pyroclastie fall 2: This is a Plinian Pumice fall deposit which occurs widely in the area south |  | Sommer, Carlos Augusto, De Lima, Evandro Fernandes, Nardi, Lauro Valentim Stoll, De Liz, Joaquim Daniel, Waichel, Breno LeitãO (2005) Neoproterozoic, Mildly Alkaline, Bimodal Volcanism in Southern Brazil: Geological and Geochemical Aspects. International Geology Review, 47 (10) 1090-1110 doi:10.2747/0020-6814.47.10.1090 | Journal (article/letter/editorial) | | LeitãO Waichel a b Universidade Federal do Rio Grande do Sul b Universidade Estadual do Oest do Paraná...Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Cx. Postal...Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Cx. Postal...Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Cx. Postal...Instituto de Geociências, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Cx. Postal |  | | Journal (article/letter/editorial) | | Geochemical Strategies, Inc., 2670 Appaloosa Way, Arroyo Grande, CA 93420, USA (rhaddad@charter.net) The application...do Porto, Praça Gomes Teixeira, 4099-002 Porto, Portugal (adoria@fc.up.pt) A 270-year ice core record...range of pumice types from at least two migrating vent systems with syndeposition of plinian pumice falls...1) The earliest deposited pumice was plausibly the earliest erupted pumice and it probably derived from...body. The enigma is that the earliest-deposited pumice is, in general, relatively poor in crystals, although |  | | Journal (article/letter/editorial) | | Abstract - The mineralogy and petrology of banded pumice clasts from a mixed-magma non-welded ignimbrite...(assemblage 3, aegirineaugite + biotite +sodic sanidine + sodalite + nepheline + sphene + low-Mg magnetite)...the Las Canadas caldera, source of the Quaternary pumice series. Small map shows the location of Tenerife...soil/erosion horizons, are mostly non-welded plinian pumice falls and ignimbrites, and at least twelve have...heterogeneous, in that they bear both mafic and salic pumice with respective contrasting phenocryst populations |  | | Journal (article/letter/editorial) | | silica-saturated and -undersaturated compositions. At Latera, pumice fragments in the same deposit can exhibit up to...indicate that the fractionation of plagioclase and sanidine largely controlled the liquid lines of descent...elements vary considerably among the different pumice types and syenites. Large ranges in Rb/Sr, Nb/Ta...example, bracket the range of most elements in all pumice types, and chemical models demonstrate that processes...more obvious in the compositions of large pumice clasts. Pumice fragments also more adequately reflect petrogenetically |  | | Journal (article/letter/editorial) | | well-exposed lava flows and domes, ash-flow tuff, air-fall pumice, and caldera-lake sediments. All eruptive units...aphyric or contain up to 15% phenocrysts of sodic sanidine =>quartz ~>ferrohedenbergite > fayalite > ilmenite..._+titanomagnetite. Whereas major-element compositions of sanidine, clinopyroxene, and fayalite phenocrysts changed...the last-erupted portion contains less than 1% sanidine and quartz. Collapse of the roof zone of the magma...range from less than 1% to 15% by volume. Sodic sanidine and quartz, the former generally more abundant |
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