 | | 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...chemical heterogeneities in the mantle sources. The Azores, located in the middle of the North Atlantic Ocean...volcanological observations. Geodynamic setting The Azores archipelago consists of nine islands and several |  | Métrich, Nicole, Zanon, Vittorio, Créon, Laura, Hildenbrand, Anthony, Moreira, Manuel, Marques, Fernando Ornelas (2014) Is the ‘Azores Hotspot’ a Wetspot? Insights from the Geochemistry of Fluid and Melt Inclusions in Olivine of Pico Basalts. Journal of Petrology, 55 (2) 377-393 doi:10.1093/petrology/egt071 | Journal (article/letter/editorial) | | 377^393 2014 doi:10.1093/petrology/egt071 Is the ‘Azores Hotspot’a Wetspot? Insights from the Geochemistry...GEOLO¤GICOS, UNIVERSIDADE DOS ACORES, PONTA DELGADA, PORTUGAL 3 UNIV PARIS-SUD, LABORATOIRE IDES, UMR8148,...F-91405, FRANCE 5 UNIVERSIDADE DE LISBOA, LISBOA, PORTUGAL RECEIVED JULY 12, 2013; ACCEPTED NOVEMBER 4,...plume’has been widely debated, and the existence of an Azores hotspot questioned. In an effort to shed new light...zone of Pico Island, the youngest island of the Azores archipelago. The bulk scoriae and lavas are moderately |  | Larrea, Patricia, Galé, Carlos, Ubide, Teresa, Widom, Elisabeth, Lago, Marceliano, França, Zilda (2014) Magmatic Evolution of Graciosa (Azores, Portugal) Journal of Petrology, 55 (11) 2125-2154 doi:10.1093/petrology/egu052 | Journal (article/letter/editorial) | | 1093/petrology/egu052 Magmatic Evolution of Graciosa (Azores, Portugal) PATRICIA LARREA1,2*, CARLOS GALE¤1, TERESA... GEOSCIENCES DEPARTMENT, AZORES UNIVERSITY, SA‹O MIGUEL, 9501-801, PORTUGAL OBSERVATO¤RIO VULCANOLO¤GICO...GEOTE¤RMICO DOS ACORES, 9560 ATALHADA, SA‹O MIGUEL, PORTUGAL 5 RECEIVED JULY 9, 2013; ACCEPTED SEPTEMBER...located to the east of the Mid-Atlantic Ridge, in the Azores archipelago.The three volcanic complexes recognized...subalkaline gabbros, found for the first time in the Azores, appears to be related to fractionation of highly |  | | Journal (article/letter/editorial) | | Island 02881, USA Abstract. Forty lavas from the Azores Islands have been analyzed for 8VSr/86Sr ratios...adjacent Mid-Atlantic Ridge which transects the Azores Plateau. 878r/S6Sr ratios in lavas from 6 of the...tholeiites from the Mid-Atlantic Ridge transect of the Azores Plateau. This suggests that lavas from these islands...similar source. However, lavas from the islands of Faial and Pico have STSr/S6Sr ratios up to 0.70394 and...the least fractionated ridge tholeiites from the Azores Plateau and alkali basalts from the islands result |  | | Report (issue) | | Fe2+ 2 SiO4 Fayalite c 2001 ° Mineral Data Publishing, version 1.2 Crystal Data: Orthorhombic. Point...Peninsula, Antarctica. Name: After Faial (Fayal) Island in the Azores, thought to occur in a local volcanic... (1975) High temperature crystal chemistry of fayalite. Amer. Mineral., 60, 1092{1097. All rights reserved |  | Turner, Michael, Turner, Simon, Mironov, Nikita, Portnyagin, Maxim, Hoernle, Kaj (2017) Can magmatic water contents be estimated from clinopyroxene phenocrysts in some lavas? A case study with implications for the origin of the Azores Islands. Chemical Geology, 466. 436-445 doi:10.1016/j.chemgeo.2017.06.032 | Journal (article/letter/editorial) | | case study with implications for the origin of the Azores Islands Michael Turner, Simon Turner, Nikita Mironov...case study with implications for the origin of the Azores Islands, Chemical Geology (2017), doi: 10.1016/j...case study with implications for the origin of the Azores Islands NU Michael Turner a, Simon Turner a*...from an NU ankaramite flow on Pico Island in the Azores. We conclude that these can be trusted to MA ... magmatic H2O AC estimates for Corvo, Flores Faial, Pico and São Miguel Islands that range from 0.28 |  | | Journal (article/letter/editorial) | | and 89.5 KJ mol-1 for tephroite (Mn2SiO4) and fayalite respectively. Thus for the cations for which the...space for forsterite (Davis and England 1964) and fayalite (Lindsley 1967) suggest values for AvO~ --Mg and...3613 J m o l - ~ b a r - ~ respectively. Thus for fayalite, the value of h will only change from 1.00 to...calculated for the pheno-tMg cryst-matrix pairs from Faial using the data of Lemar- chand (1984). Figure 8...Mg partition coefficients for phenocrysts from Faial as calculated from the chemistry of the melt alone |  | Larrea, Patricia, França, Zilda, Lago, Marceliano, Widom, Elisabeth, Galé, Carlos, Ubide, Teresa (2013) Magmatic Processes and the Role of Antecrysts in the Genesis of Corvo Island (Azores Archipelago, Portugal) Journal of Petrology, 54 (4) 769-793 doi:10.1093/petrology/egs084 | Journal (article/letter/editorial) | | Antecrysts in the Genesis of Corvo Island (Azores Archipelago, Portugal) 1 EARTH SCIENCES DEPARTMENT, UNIVERSITY... GEOSCIENCES DEPARTMENT, AZORES UNIVERSITY, SA‹O MIGUEL, 9501-801, PORTUGAL 3 DEPARTMENT OF GEOLOGY...crystallization; Azores I N T RO D U C T I O N Corvo is one of nine islands of the Azores archipelago, located...(WNW^ESE) observed throughout the other islands of the Azores archipelago are not dominant in Corvo and Flores...al., 2006a). In contrast to most islands of the Azores archipelago, few studies have dealt with Corvo |  | | Report (chapter) | | hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores M. Storey, J. A. Wolff, M. J. Norry & G. F. Marriner...Marriner SUMMARY: The island of Sao Miguel in the Azores exhibits bimodal volcanism: eruptives from Agua...Campbell 1986). The island of Sao Miguel in the Azores (Fig. 1) contains an example of this bimodal style...Miguel, the largest of the nine islands forming the Azores (Fig. 1). Volcanic rocks from Agua de Pau belong...suite and are amongst the most potassic in the Azores (White et al. / 251W Cor~/o 3ff'lw 9 Flores |  | | Journal (article/letter/editorial) | | Alkaline granite xenolith Alkaline granite xenolith Fayalite syenite xenolith 4.68 3.01 9.25 5.60 8.50 1.58...30 1.45 Nightingale Trachyte 4.68 2.81 Azores Faial Pico Tristan Group Tristan da Cunha South |  | | Journal (article/letter/editorial) | | xenoliths from Lanzarote, the Auvergne and Faial (Azores) were also examined. Most of the X-ray data...Olivine Magnetite Enstatite i.e. for every mole of fayalite converted to magnetite, sufficient silica is released |  | | Journal (article/letter/editorial) | | 6 451 Basalt, Pb/Pb, U/Pb, Atlantic Ocean, Faial, Azores, Trindade (Oversby, V.M.) 11 5 401 Biotite,...Harold S., et al.) 14 3 397 Lead, basalt, Faial, Azores, Trindade (Oversby, V . M . ) 11 5 401 Lead...6 437 Rare earths, basalt, Mid-Atlantic Ridge, Azores (Schilling, J.-G.) 25 2 103 Sea water, GEOSECS...) 12 4 373 Uranium, methods, chemical analysis, Azores, Saint Helena, Ascension Island, Tristan da Cunha...rotation, Tertiary (Storetvedt, K.M.) 17 1 135 Spain, Portugal, Iberia, Armorican Shear Zone, rotation, Hercynian |  | | Book (volume) | | Mg 2 Si0 4 (forsterite) and Fe 2 Si0 4 (fayalite): the fayalite - knebelite (FeMnSi0 4 ) - tephroite (Mn...shows complete solid solution. In the forsterite - fayalite series, however, manganese is usually present...ideal composition, and members of the forsterite - fayalite series in general do not contain appreciable amounts...variation. t Values for synthetic forsterite and fayalite (Schwab and Kustner, 1977). 4 Orthosilicates...members occur in gabbros and ferrodiorites and fayalite is present in some acid and alkaline plutonic |  | | Journal (article/letter/editorial) | | forsterite Magma Signatures in the Terceira Rift Azores: a melt inclusion study MARQUARDT, KATHRINA1 AND...University of Lisbon, Portugal ETH Zürich, Switzerland 3 EMEPC & University of Évora, Portugal 4 University of...African plates on the Azores plateau [1]. Seismic tomography suggests that the Azores plume is centered NE...supplying upwelling plume material SW of Terceira (e.g. Faial) [2]. Melt inclusions (MI) are small portions of...EN10, Sacavém, Portugal (rmarques@ctn.ist.utl.pt) 2 GeoBioTec, Univ. Aveiro, Aveiro, Portugal 3 Centro de |  | | Book | | Arsenopyrite, Panasqueira, Castelo Branco district, Portugal * 11.5 x 9.5 x 4.6 cm Arsenopyrite Formula FeAsS...the future they will probably contain no tin at Portugal; San Piero, Campo, Elba, Italy. Africa: Otjimbojo...many mines in Cornwall, England; Panasqueira, Portugal; Freiberg and Neudorf, Harz Mountains, and Siegerland...Schneeberg and Johanngeorgenstadt, Germany; Sabugal, Portugal. Africa: Shinkolobwe, Democratic Republic of the...Untersulzbachtal, Salzburg, Austria; Panasqueira, Portugal. Africa: Onganja Mine, Namibia; Phalaborwa, Limpopo |  | | Book | | well acquainted with the volcanoes of Iceland, the Azores, the Canaries and the Mediterranean islands. When...that fractionation along a buffer [whether NNO or fayalite-magnetite-quartz (FMQ)] requires that the magmatic...documented by Christie et al. (1986), at or near the fayalite-magnetite-quartz buffer. Such low oxidation states...settings (see later). In the examples of Iceland, the Azores and the Galapagos archipelagos (Schilling et al...ocean ridge hot-spot magmas (e.g. Iceland, the Azores and the Galapagos) clearly reflects changes in |  | | Book | | the Caldeira Volcano of the ocean island of Faial, Azores; © Christoph Beier, University of Helsinki,...binary solid solution of forsterite (Mg2SiO4) and fayalite (Fe2SiO4). Many other minerals are solid solutions...(Klügel & Klein, 2006; Schwarz & Klügel 2004). The Azores also record deep crystallization of clinopyroxene...Atlantic Ocean Cape Verde 0 Canary Islands Madeira Azores Tristan da Cunha Ascension Depth (km) 5 10...Schwarz & Klügel 2004; Klügel & Klein, 2006. The Azores; Renzulli & Santi 2000; Beier et al., 2006; Dias |  | | Book | | sensitive to small changes in the amount of the fayalite-magnetiteoxygen present. The variable oxidation...Temperature and upwelling velocity fields for the Azores plume inverted from U-Pa disequilibria data (after...Partial melting and upwelling rates beneath the Azores from a U-series isotope perspective. Earth and...beneath Mount Gambier in South Australia 0.03 and the Azores archipelago in the 0.02 mid-Atlantic. The results...beneath Mount Gambier and 3-4 cm per year beneath the Azores. These 0 slow rates are consistent with the -0 |  | | Report (issue) | | Sociedade Portuguesa de Ci€mcias Naturals. Lisboa, Portugal. Nauchno-issled. Inst. Zemnogo Magnetizma Trudy-Trudy...and it was predicted that a spinel polymorph of fayalite should become,stable around 50,000 bars at 700°...constant of 8.235 A and is 12 percent denser ·than fayalite. A thermodynamic study of the stability of MgSiOs...Primeira notfcia da erup~ao dos Capelinhos na Ilha do Faial [First report on the eruption of Capelinhos on Fayal...volcano Capelinhos off the tip of Fayal Island in the Azores (see Geophys. Abs. 173-361) that began late in |  | | Book | | in deposits of tin and tungsten (Panasqueira, Portugal), in porphyry-type deposits, in alpine clefts...(Czechoslovakia), Ticino (Switzerland), Panasqueira (Portugal), and Maine (United States) It exhibits a yellowgreen...stone that was estimated at only 90 crowns in Portugal sold for 600 in India.”’ In Europe cat’s-eye worn...Mazarin bought from her the Sancy and the Mirror of Portugal through the duke of Epernon and gave both stones...these emeralds were coveted by Queen Isabel of Portugal, wife of Charles V. Nevertheless, Cortés saved |  | | Journal (article/letter/editorial) | | r implications ages and stress pattern in the Azores; geodynamic 46(2): 275-286 0856 Ferraes, S. G...faulting at a lithospheric plate boundary; the Portugal earthquake of 1969 18(2): 205-216 0939 Funk...2017 Oversby, V. M. Lead in oceanic islands; Faial, Azores and Trindade 11(5): 401-406 2018 Oversby,...content of organic matter 2332 Schilling, J. G. Azores mantle blob; rare-earth evidence 2333 Schilling...R . J . Activity-composition relations in the fayalite-forsterite solid solution between 900* and 1300"C |  | | Book (edition) | | Forsterite. Mg 2SiO,. orth., fom1s a series with Fayalite, Ftj"SiO,. orth.," means that minerals are known... dimorph. with Arsenolitc. San Domingo mines, Portugal O Clausthalite. PbSe. cub .. forms a series... D Fayalite, Fe~ SiO,. orth" forms two seri~-s.with Forsterite and with Tepbrolte. Fayal (Faial) Island...Ringwoodite and Wadsleyite.forms a 54:ries with Fayalite, Monte Somma. Vesuvius, Campania, ltaly O/frine...(POJ..(Oll):·811 10. mon .. ~I:mgualde. Beira. Portugal. Nell' i\li11s.(1997). 75. 401 404. 59. 964-973 |  | | Report (volume) | | 1-190 MPa under the oxygen fugacity along the fayalite-magnetite-quartz (FMQ) and cobalt-cobalt oxide... 5 4 1 1 11 11 16 1 1 Abbreviations: FMQ, fayalite-magnetite-quartz; CCO, cobalt-cobalt oxide. Abbreviations:...performed under the oxygen fugacity (/O2) along the fayalite-magnetite-quartz (FMQ) and cobalt-cobalt oxide...SHIREY, S.B. 1996. Os isotope systematics in the Azores: implications for mantle plume sources. Earth and...expected for basaltic glass equilibrated at the fayalite-magnetite-quartz (FMQ) oxygen buffer (Wallace |  | | Book (edition) | | 8c) (Si04)^ OLIVINE GROUP Forsterite Mg2Si04 - Fayalite Fe2Si04 GARNET GROUP Pyrope Mg3Al2Si3012 ZIRCON...composition from Mg2Si04 (forsterite) to Fe2Si04 (fayalite). The common rock-forming variety, found in basalt...(close to forsterite) to more iron-rich (towards fayalite). At the same time, plagioclase will change in...to the popular are the volcanoes that form the Azores. In the idea of what a typical volcano should...commences as Surtsey (1963-1965) or that at Faial in the Azores phreatic (1957), they are by no means confined |  | | Report (issue) | | Mag = magnetite, Cam = Ca clinoamphibole, Fa = fayalite, Ilm = ilmenite, Ap = apatite, Zrn = zircon, Mnz...abundant upward relative to sanidine in CPT XIII, and fayalite decreases in abundance upward and finally disappears...(Si, Na), anorthite (Al, Ca), orthoclase (K), fayalite (Fe), synthetic SrTiO3 (Sr), and barite (Ba)....(Si, Mg), anorthite (Al), synthetic TiO2 (Ti), fayalite (Fe), rhodonite (Mn), wollastonite (Ca), and omphacite...restored. The eruption of CPT XV, which began with fayalite-bearing lavas and progressed to pigeonite-bearing |
|
