 | | 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 |  | 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 |  | | 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 |  | | 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...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...(Laughton & Whitmarsh, 1974). The island of Sao Miguel belongs to the eastern island group, and straddles |  | | 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) | | crystallization, 19ss022-1, sytnite, PPL, (h)(g) anhedral aegirine fill in the crystal framework in the (f) same...clinopyroxene; Aeg, aegirine; Arf, arfvedsonite; the sytnite, 14ss003-3, PPL, (h) anhedral aegirine fill in the...Afs, alkali feldspar; Cpx, clinopyroxene; Aeg, aegirine; Arf, arfvedsonite; Ap, line represents the boundary...◦ 0 ◦ 0 ◦ 0 ◦ 0 ◦ 7 of 21 Azores, Kilombe, Kenya Portugal 0 112 55 47” 112 55 41”and112 57...12 0.08 0.09 0.05 0.01 0.09 0.24 0.22 Kilombe, Azores, MgO 0.14 0.28 0.27 0.17 0.32 0.10 0.21 0.09 0 |  | | Journal (article/letter/editorial) | | have been determined together with two pliniau pumice fall deposits, one of which is locally welded in...methods of tephrochronology as applied to non-welded pumice fall deposits (WALKEa & CnOASDALE, 1971; BOOT~I...welded turfs have been determined together with two pumice fall deposits, one of which is locally welded in...[] eutaxitic (fiamme) ] rheomorphic c, oo pumice 18 19 17 16 15 14 13 mB m.=,m lithics...pw basalt ] rhyolite ~50m "2----] ~ U" dw pumice fall ] ~,~U ' u" =N NG N N ~N []r reworked |  | | 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 |  | | Journal (article/letter/editorial) | | of the Nordeste v o l c a n k complex, SZo Miguel, Azores LOUIS A. FERNANDEZ ' Deparrliient of Eaitli...r d e s t e v o l c a n i c complex of 0 S a c Miguel i s l a n d i s o n e .of t h e o l d e s t k...hypabyssa'l i n t r u s i o n s ' and t o t h i n of P Azores. Numerous mafic dirkes v e n e e r s of t c p...1- Nordes t e v q l c a n i c s a n d Terceira (Azores) i n t h e f r a c t i o n a t i o n scheme a...o b e u n d e r l a i n by i s l a n d s , S ~ Miguel O i s most s i m i l a r t o . INTRODUCTION Gough |  | | Journal (article/letter/editorial) | | Abstract - The mineralogy and petrology of banded pumice clasts from a mixed-magma non-welded ignimbrite...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...most of these, black-and-white streaky or banded pumice is present together with varying proportions of |  | | Journal (article/letter/editorial) | | Federal do Rio Grande do Sul , Porto Alegre, RS, Brazil b Universidade Federal do Rio Grande do Sul , Bento...Survey of Brazil, and Universidade Federal do Rio Grande do Sul, Banco da Província, 105, CEP 90840-030...03:31 06 December 2014 Universidade Federal do Rio Grande do Sul, Bento Gonçalves, 9500, CEP 91540-000 Porto...syn-eruptive layered deposits composed of glass, pumice, and lithic fragments; and (4) volcanogenic sedimentary... Pyroclastic flow deposits are represented by pumice flow (ignimbrites) and co-ignimbrite breccia, consisting |  | | 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 |  | Macdonald, R., Bagiński, B., Leat, P.T., White, J.C., Dzierżanowski, P. (2011) Mineral stability in peralkaline silicic rocks: Information from trachytes of the Menengai volcano, Kenya. Lithos, 125 (1) 553-568 doi:10.1016/j.lithos.2011.03.011 | Journal (article/letter/editorial) | | settings, e.g. ocean islands such as Terceira, Azores (Self and Gunn, 1976) and Socorro Island, Mexico...mainly lavas (at least 70 flows), sheet-forming fall pumice deposits and strombolian cinder cones. 2. Menengai...to reduce the peralkalinity of residual melts. Aegirine-augite occurs as phenocryst rims in K1A34/1 (Ti...majority are hedenbergites or sodian hedenbergites. Aegirine-augite phenocrysts (as opposed to the rims of...Menengai, all with PI N 1.5. The occurrence of aegirine-augite is not related in any simple way to a compositional |  | | Catalog/List | | I ins £5 2 AEGIRINE £10 Pyroxene Malawi lxl £1.10 lx2 Mount sic Hilaire. Quebec 34 AEGIRINE Rich line... _ . Pure black mica plate new Analysis , Saga Quarry. Tvedalcn near Ix I £3 I x2 £6 2x2 £ 12 7 AN!lilTE...__ ____ _____ ___ _l~rtl_u~~-..fra.nce___ __ Rio Grande do Norte Brazil lx½£5 lxl 62 BISl\lOCLITE Rich...- Creamy white micro crystals in cavirties Saga Quarry, Tvedalen, Norway Ix½ £3 59 BOEHl\lITE AIO OH inNatrolite...AMITE Rich brown fibrous in matrix. Found Meldon Quarry, lx2 £2 lxl £1 _ ~_Ca SJ2.._ __ __ some ycm ago |  | Romano, Pierangelo, Scaillet, Bruno, White, John C., Andújar, Joan, Di Carlo, Ida, Rotolo, Silvio G. (2020) Experimental and thermodynamic constraints on mineral equilibrium inpantelleritic magmas. Lithos, 376. 105793pp. doi:10.1016/j.lithos.2020.105793 | Journal (article/letter/editorial) | | about 90% of the outcrop, occurring as ignimbrites, pumice fall deposits, na or vitric lava flows and domes...characterized by alternating eruptions of lava flows and pumice fall deposits (Mahood and Hildreth 1986; Jordan...activity (to ~8 ka) that formed the trachytic Montagna Grande-Monte Gibele shield volcano and several other pantellerite...(about 10% volume), one representing the basal pumice fall of the Green na Tuff eruption (GTP; P.I...I = 1.68) and one representing a younger pumice deposit („Fastuca‟ eruption, ur FTP; P.I.=1.56), which |  | | Journal (article/letter/editorial) | | Switzerland and Japan, sector structure, opt., I.R., 453 Aegirine, Caithness, authigenic, anal., X-ray, 439; Greenland...corundophilite, 171 Analcime, Italy, anal., determination in pumice by X-ray diffractometry, io3; New South Wales,...geochemistry of loveringite, 187 Cannington Park quarry, Somerset, djurleite, 172; durangite, 172; milarite... see EGGLETON (R. A.), 361 and M37 Cheesewring quarry, Linkinhorne, Cornwall, danburite, I7I Chernovite...iron-bearing melts, Pt-Fe alloys for, 271 Coombe Farm quarry, Henbury, Somerset, wulfenite, 298 Coon Creek, |  | | Catalog/List | | wreck in 1885 St Ives, Com\~'!!_!!,_~gl~nd____ 2 AEGIRINE Very rich mass of black crystals, some Mount Malosa..._______ __ Malawi £10 _---- -- - -- - --·- ·- 34 AEGIRINE Rich fine grained black crystalline mass Mount...- - - AMAZONITE Pure green cleavage Landsverlc quarry, Evje, Norway lxl S0p ALAMOSITE fcLp 10 g:...with Chrysotile, pale grey-green County Bridge Quarry,Lizard ,Cornwall MgFeSiO massive. Minas Gerias...ARFVEDSONJTE MAGNESIO. New identification, previously Aegirine. _Rich black fibrous in Sweden _ ~mJ>~i~_ole - |  | Romano, Pierangelo, White, John Charles, Rotolo, Silvio Giuseppe, Jordan, Nina J., Cirrincione, Rosolino, De Giorgio, Giovanni, Fiannacca, Patrizia, Vaccaro, Epifanio (2022) Contrasting Styles of Inter-Caldera Volcanism in a Peralkaline System: Case Studies from Pantelleria (Sicily Channel, Italy) Minerals, 12 (4) 406 doi:10.3390/min12040406 | Journal (article/letter/editorial) | | took place from small local centers that built pumice cones and/or lava domes/shields, Minerals 2022...intra-caldera Monte Gibele vent (including the Montagna Grande uplift), which was followed by a spatially and...complex series of interdigitated pantelleritic pumice fall sequences [10,11]. This mildly explosive activity...rheomorphic, and they are frequently associated with pumice fallout deposits, located either below or atop...pantellerite lava centers of Gelkhamar, Gibele-M.gna Grande, etc.), (ii) purely explosively magmatism, which |  | | Journal (article/letter/editorial) | | 20: 207-223. ~ The late Quaternary phonolitic pumice deposits of Tenerife, Canary Islands, are the product...liquid', comparison of this sample with phonolitic pumice, and with fully crystallised syenites, allows reconstruction...sodium enrichment in the residual liquid. Stellate aegirine, lavenite, loparite and Mn-rich ilmenite are among...trends and relations a m o n g mafic phases such as aegirine-augite and alkali amphiboles. Virtually all o...soil/erosion horizons, are mostly non-welded plinian pumice falls and ignimbrites. At least twelve have bulk |  | D'Antonio, Massimo, Arienzo, Ilenia, Brown, Richard J., Petrosino, Paola, Pelullo, Carlo, Giaccio, Biagio (2021) Petrography and Mineral Chemistry of Monte Epomeo Green Tuff, Ischia Island, South Italy: Constraints for Identification of the Y-7 Tephrostratigraphic Marker in Distal Sequences of the Central Mediterranean. Minerals, 11 (9) 955 doi:10.3390/min11090955 | Journal (article/letter/editorial) | | on-land from the MEGT. Juvenile clasts include pumice, scoria, and obsidian fragments with porphyrit...feature allows the discrimination of MEGT from aegirine-bearing, distal tephra layers erroneously attributed...3—Fucino Basin, Abruzzo, Central Italy [2]; 4—Lago Grande di Monticchio, Basilicata [4,6]; 5—San Gregorio...3—Fucino Basin, Abruzzo, Central Italy [2]; 4—Lago Grande di Monticchio, Basilicata [4,6]; 5—San Gregorio...extracaldera deposits include a coarse-grained Plinian pumice fall deposit, a widespread lithic breccia, and |  | Fontijn, Karen, Elburg, Marlina A., Nikogosian, Igor K., van Bergen, Manfred J., Ernst, Gerald G.J. (2013) Petrology and geochemistry of Late Holocene felsic magmas from Rungwe volcano (Tanzania), with implications for trachytic Rungwe Pumice eruption dynamics. Lithos, 177. 34-53 doi:10.1016/j.lithos.2013.05.012 | Journal (article/letter/editorial) | | (Tanzania), with implications for trachytic Rungwe Pumice eruption dynamics Karen Fontijn a,b,⁎, Marlina...important studied deposits, the Isongole and Rungwe Pumice, co-existing Fe–Ti oxides constrain pre-eruptive...oxygen fugacity to NNO+0.25–NNO+0.45. For the Rungwe Pumice, melt inclusions suggest that the melt was water-undersaturated...two most prominent deposits, the Rungwe Pumice and Isongole Pumice, electron microprobe analyses of phenocrysts...pyroclastic fall deposit of the ~ 4 ka Plinian Rungwe Pumice eruption. Physical modelling suggests that the |  | | Journal (issue) | | Biotite-rich haiiyne-phonohte 8. 9. Apatite-aegirine augite-haiiyne 'clot Hornblende-pyroxene Hornblende-phonolite...Verde was published by the Geological Survey of Portugal in 1932 very appropriately 100 years after Charles...speckled with phenocrysts of haiiyne, nepheline, aegirine-augite, and, in certain types, of sanidine. These...The usual pyroxene of the phenocrysts is a green aegirine-augite with well-marked pleochroism, X yellow...green and approaching aegirine (Xac 0-7°), may be replaced by a zone of ragged aegirine grains. The pyroxene |  | | Report (issue) | | Bahati and Kinangop Tuffs and associated lavas (i) Pumice tuffs (ii) Graded tuffs-lacustrine sediments (iii)...Porphyritic Trachyte (b) Nakuru Lake Syndicate Quarry Phonolite .. (c) Mbaruk Basalt.. (d) Gilgil Trachyte...general fairly gentle. Deep valleys cut into the soft pumice mantle give a dissected appearance, though this...basalt and picrite lava flows, and subordinate pumice showers. These were in part erupted from swarms...in localized deposits of lake beds—well-graded pumice tuffs and diatomite. This phase of eruption was |  | | Book | | New York, Melbourne, Madrid, Cape Town, Singapore, São Paulo Cambridge University Press The Edinburgh Building...rock fragments, a vitric tuff a predominance of pumice and glass fragments, and a crystal tuff a predominance...diopside, commonly zoned to, and mantled by, titanian aegirine; spinels ranging in composition from Mg-bearing...Republic Sweden from Latin Madagascar Australia Portugal South Africa 81 77 76 69 63 57 42 39 31 28 23...1947a, p.105; Abessédo Mine, Bragança district, Portugal; Tomkeieff p.3) ABSAROKITE. A collective term |  | | Journal (article/letter/editorial) | | epidote, hornblende, diopsite, 427 Cheesewring quarry, Linkinhorne, danburite, 171; durangite, I72 Chycornish...Crowns Rock, St. Just, Land's End, garnet, 427 Dean quarry, The Lizard, djurle'ite, I72; analcime, adularia...penwithite (= neotocite), 279 and M26 Devon Meldon quarry, Okehampton, greenovite, 172; priceite, 175 Ramsley...Cannington Park quarry, djurlei'te, I72 Combe Farm quarry, Henbury, wulfenite, 298 Merehead quarry, Shepton...Firth of Clyde, tholeiite, 4~7 Halkirk, Caithness, aegirine, 439 Imachar, Isle of Arran, tholeiite, I4I Isle |
|
Pumice quarry, Ribeira Grande, São Miguel, Azores, Portugal