 | | 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:...interaction. Smectite, kaolinite, halloysite-7 Å and opal-A occur in assemblages with alunite. Smectite represents |  | Li, Gaojun, Hartmann, Jens, Derry, Louis A., West, A. Joshua, You, Chen-Feng, Long, Xiaoyong, Zhan, Tao, Li, Laifeng, Li, Gen, Qiu, Wenhong, Li, Tao, Liu, Lianwen, Chen, Yang, Ji, Junfeng, Zhao, Liang, Chen, Jun (2016) Temperature dependence of basalt weathering. Earth and Planetary Science Letters, 443. 59-69 doi:10.1016/j.epsl.2016.03.015 | Journal (article/letter/editorial) | | by the precipitation and dissolution of biogenic opal (Conley, 2002; Derry et al., 2005; Harrison et al...34. Big Island, Hawaii 35. High Cascades 36. São Miguel 37. Iceland 14.00 14.90 20.80 17.00 24.80 27...The saturation state of rivers in Iceland and Sao Miguel suggest that weathering of basalt might be relatively..., 2013. Fluvial geochemistry in São Miguel Island (Azores, Portugal): source and fluxes of inorganic solutes...geochemistry in an active volcanic environment (São Miguel, Azores): source and fluxes of inorganic solutes. |  | | Journal (article/letter/editorial) | | the abandoned Ervedosa tin mine in north-eastern Portugal—M. Elisa P. Gomes and Paulo J.C. Favas The relationship...granitic pegmatites of the Pampean Ranges, Argentina— Miguel Angel Galliski and Petr Cern? The behavior of rare-earth...zircon-forming processes—Fernando Bea, Pilar Montero, and Miguel Ortega Texture, composition, and origin of rutile...J. Algeo, Timothy Lyons, and Armelle Riboulleau Opal as a U-Pb geochronometer: Search for a standard—...Assumpção 173 Tectonic evolution of the Neoproterozoic São Gabriel block, southern Brazil: Constraints on Brasiliano |  | Maza, Santiago, Collo, Gilda, Morata, Diego, Cuña-Rodriguez, Carolina, Taussi, Marco, Renzulli, Alberto (2021) The Hydrothermal Alteration of the Cordón de Inacaliri Volcanic Complex in the Framework of the Hidden Geothermal Systems within the Pabelloncito Graben (Northern Chile) Minerals, 11 (11) 1279 doi:10.3390/min11111279 | Journal (article/letter/editorial) | | acid-sulfate alteration with alunite + kaolinite + opal CT + anatase, indicating the presence of a steam-heated...steam-heated blanket with massive fine-grained silica (opal-CT), likely accumulated in mud pots where the intersection...diatom remnants, in addition to alunite + kaolinite + opal CT + anatase assemblages, is consistent with a superimposition...for opal-A are centered at ∼4 Å (∼22.2◦ 2θCu-Kα; ∼25.2◦ 2θCo-Kα), for opal-A/CT, opal-CT and opal-C at... from non-crystalline opal-A and opal-A/CT to opal-CT and paracrystalline opal-C to, finally, microcrystalline |  | | Journal (issue) | | France; Rui Galopim de Carvalho, Portugal Gemas, Lisbon, Portugal; Lee A. Groat, University of British...unusual materials such as labradorite, moonstone and opal. Figure 22: In the late 1800s, Wilhelm Schmidt...materials, such as morganite, heliodor, amazonite, opal, kunzite, iolite, apatite, jasper and garnet, also...only a few decades after Brazil was claimed for Portugal by Pedro Álvares Cabral in 1500. Led by an explorer...Boa, ~5 km from the Cruzeiro tourmaline mine in São José da Safira. (This is ~120 km north-east of the |  | | Journal (article/letter/editorial) | | Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, Brazil, vajanasi@usp.br...Magmatic processes beneath Furnas volcano, São Miguel, Azores 2 LEGOS (CNRS/UPS/IRD/CNES) Observatoire...Universidade dos Açores, 9501-801 Ponta Delgada, Açores, Portugal 3 Department of Earth and Environmental Sciences...University, Milton Keynes, MK7 6AA, UK 1 Furnas, São Miguel, Azores is an oceanic-island caldera volcano characterised...Conference Abstracts Halogens in basalts of the Azores, Canaries and Tristan da Cunha Reducing uncertainty |  | | Journal (article/letter/editorial) | | A137 Geochemical variability of the mantle beneath São Tomé Island (Cameroon Volcanic Line) Impact of sulfide...1 LNEG- U. Geologia e Cartografia Geológica, Portugal (*correspondence: rita.caldeira@ineti.pt) 2 CeGUL-...Univ. Lisboa 4 LATTEX- Fac. Ciências, Univ. Lisboa São Tomé is an intraplate oceanic island belonging to...regarding its source of magmatism. Here we look at São Tomé elemental geochemistry in light of the main...Afonso Volcanic Complex (CRA: 2.5 - 5 Ma) and the São Tomé Volcanic Complex (CST: < 1.5 Ma). Major and |  | | Journal (article/letter/editorial) | | calcite or dolomite, zeolites, kaolinite, sulfates, opal-CT PT E D as well as traces of halite, pyrite...traces of chlorite, sulfates, halides, feldspar, opal-CT, talc, serpentine, or hematite (Table 2). Sulfates...but which still contain traces of illite, quartz, opal-CT, carbonates, or other minerals (Table 2). We...problem because boron concentrations in quartz, opal-CT and carbonates are usually lower than in smectite...waters: cases of Ischia (Italy) and São Miguel (Azores, Portugal). Hydrol. Process. 22, 4386–4399. Morrison |  | | Journal (article/letter/editorial) | | control of metals in a mountainous river basin, NE Portugal ESTELA REINOSO-MASET*, PAUL J. WORSFOLD AND MIRANDA...Vila Real, Portugal, and Centre for Geophysics, University of Coimbra, Coimbra, Portugal (anarreis@utad...Corgo mountainous rural hydrographic basin (NE Portugal). These two zones correspond to relatively large...9-16. Goldschmidt Conference Abstracts 2008 Azores and MAR basalts similarity, a multidimensional...Paço D’Arcos Portugal (luisapr@emepc-portugal.org) Basalts from the MAR near the Azores attest a 1000 |  | | Book | | ELIAS DOLIANITI 1941 COMPANHIA EDITORA NACIONAL São Paulo — Rio — Reeito — Porto Alegro Do original:...Província da Bala «eseseeereesesemes VE A breia do São Francisco VIE — Provincia da Baia — Interlor ..e...Tala — Geologia dos arredores do São Sale vador o Estrada de Ferro São Francisco .....+ 1X — Provincia...Provincias de Gisa e Mto Grosso aros XVII—Provincias de São Pauio, Paraná, Santa Catasina o Rio Grande do Sul...Branner. 1875 — exploração das regiões auríferas de São Gonçalo e Campanha, Minas. 1875 — dezembro — conferência |  | | Book (edition) | | 22 23 24 25 26 27 28 29 30 31 Spodumene Quartz Opal Turquoise Lapis Lazuli Jade – Geology and Mineralogy...Gemstones’ becoming ‘Colour and Colour Enhancement’, and ‘Opal’ xiii Preface to the Fifth Edition being extracted...Pierre Gilson including, most importantly, synthetic opal, both white and black, and a corresponding ingenuity...stone’, a special type of glass closely resembling opal in appearance. Quartz, which for many years has...crystallized from the magma of its host rock. Both the fire opal and the amethyst have formed from hydrothermal fluids |  | | Book (volume) | | Kieselsäureverbindungen . Analysenmethoden von Quarz , Chalcedon , Opal. M. Dittrich (Heidelberg) 1 27 61 110 110 C...Feueropal 243. -- Menilit 243. Hyalit 242. Gemeiner Opal 244. - Eisen- und tonerdereiche gemeine Opale 245...EigenSulfuricin 272. schaften 271. Synthese und Genesis 271. Opal C. Doelter (Wien) 273 Analysenmethoden der Be-...sich das wasserhaltige Kieselsäuregel als Sinter, Opal usw. ab. An der Quelle La Tacita (Cerro de los humaredos...durch langsame Verdunstung und Abkühlung entstand Opal, z. B. Hacienda Esperanza, S. Juan 44 J. KOENIGSBERGER |  | | Journal (issue) | | Lenticular cloud forms over Pico Volcano, Pico Island, Azores. Photo credit: William M. White Photo credit back...when I was a post-doc at Carnegie. Figure 2.1 Azores, Coast of Faial Island. GEOCHEMICAL PERSPECTIVES...the Azores, where he documented similar gradients in La/Sm ratios along the ridge as the Azores was approached...also spent a month collecting samples from the Azores Islands themselves. These are strikingly beautiful...anomaly along the ridge in the vicinity of the Azores, more or less as Schilling’s plume-asthenosphere |  | | Journal (article/letter/editorial) | | -30Si (upper 100 m), mixed layer depth and biogenic opal export in the North Atlantic (left) and in the Southern...Abstracts Constraining the nature of the western Azores mantle source using Pb-Hf-Os isotope systematics... D-91054 Erlangen, Germany 1 Basalts from the Azores islands in the central NorthAtlantic provide an...the deeper mantle brought to the surface by the Azores plume. Here, we present Hf, Pb and Os isotopes...geochemically well-characterised primitive lavas from the Azores islands. New data are presented from the islands |  | | Book | | Sect. 2.5). For instance, calcite, aragonite and opal form skeletons or shells of microorganisms and invertebrates...is opal-A, SiO2·nH2O, with the varieties opal-AN (hyalite, potch opal) and opal-AG (precious opal; 7...62a, b). Like other, initially amorphous minerals, opal—growing in free space and under the influence of...leading to opalescence and iridescence on precious opal (. Fig. 11.62a), adularescence on the K-feldspar...attractive semi-precious gem-quality variety of opal, SiO2·nH2O, has a Mohs' hardness of only 5½–6½ and |  | | Book | | JW (1962) Capelinhos eruption of Fayal volcano, Azores, 1957–1958. J Geophys Res 67:3519–3529 Macías JL...1992; Bolsena Lake, Italy, Mosello et al. 2004; Azores lakes, Martini et al. 1994) to extreme fluids with...(1994) Chemical characters of crater lakes in the Azores and Italy: the anomaly of Lake Albano. Geochem...assemblages of silica polymorphs (cristobalite and opal), gypsum, anhydrite, alunite, natroalunite, elemental...composition in amorphous silica (δ18O(opal)). These δ18O(opal) values reveal maximum water temperature |  | | Book | | New York, Melbourne, Madrid, Cape Town, Singapore, São Paulo Cambridge University Press The Edinburgh Building...visitors: the Cape Verde Islands, the Canaries, and the Azores. The Portuguese Cape Verde Islands are home to...crowds, but you have to try hard to do so. The Azores islands compete with the Canaries as the prime...good weather, but they are far less crowded. The Azores have several historically active volcanoes, including...unusually named Agua de Pau (“Tree Log Water”) in São Miguel island, last active in 1564. Submarine eruptions |  | | Book | | attain saturation with either amorphous silica or opal-CT and the Na-K geo-thermometer gives unrealistic...Saccorotti G (2008) Seismic tomography of Central São Miguel, Azores. Phys Earth Planet Inter 167(1–2):8–18 Zeng | | | Book | | attain saturation with either amorphous silica or opal-CT and the Na-K geo-thermometer gives unrealistic...Saccorotti G (2008) Seismic tomography of Central São Miguel, Azores. Phys Earth Planet Inter 167(1–2):8–18 Zeng |  | | Journal (article/letter/editorial) | | 4Instituto Geofísico, Universidade de Coimbra, Portugal Introduction: MIL 03346 is one of the seven members...Bischoff4, and K. Metzler4. 1University Coimbra, Portugal. 2University of Manchester, Manchester, UK. 3University...Bischoff4, and A. K. Sokol4. 1University Coimbra, Portugal. 2University of Manchester, Manchester, UK. 3University...Fernandes1, 2, 3 and R. Burgess2. 1University Coimbra, Portugal. 2University of Manchester, Manchester, UK. 3University...dissolution of calcite and sediments contain siliceous (opal) microfossils or are barren. An exception to this |  | | Report (volume) | | Pailhes S, Willand A, Caliste D, Botti S, San Miguel A, Goedecker S, Marques MAL (2012) Crystal structure...Strike (37°17′N) hydrothermal fluids, south of the Azores Triple Junction on the Mid-Atlantic Ridge. Chem...Nicaragua Nicaragua Nicaragua Papua New Guineau Portugal Tanzania Tenerife Lassen Mt. Shasta Ukinrek Maars...Chemistry of waters from Furnas volcano, São Miguel, Azores: fluxes of volcanic carbon dioxide and leached...1007/s00410008-0348-3 Custers JFH (1950) On the nature of the opal-like outer layer of coated diamonds. Am Mineral |
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Água de Pau Volcano, São Miguel, Azores, Portugal