 | | 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 |  | Reagan, Mark K., Turner, Simon, Legg, Matthew, Sims, Kenneth W.W., Hards, Victoria L. (2008) 238U- and 232Th-decay series constraints on the timescales of crystal fractionation to produce the phonolite erupted in 2004 near Tristan da Cunha, South Atlantic Ocean. Geochimica et Cosmochimica Acta, 72 (17) 4367-4378 doi:10.1016/j.gca.2008.06.002 | Journal (article/letter/editorial) | | available online 12 June 2008 Abstract Phonolite pumice found floating offshore of Tristan da Cunha following...On August 3, 2004, local fisherman found angular pumice floating some 5 km to the east of Tristan. The highb...seismic swarm, and the sudden appearance of fragile pumice all suggested the earthquake activity was associated...arrived on Tristan in middle September, and collected pumice blocks 4368 M.K. Reagan et al. / Geochimica...beaches (Hards, 2004). A representative block of this pumice was analyzed beginning the following November for |  | 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) | | unit comprises alternations of lithic-rich and pumice-rich layers (Figs.1e–h), within which welded tuff...2008; Stock et al., 2016), in addition, the Furnas (Azores) and Astroni (Campi Flegrei) volcano also seem...magmatic system: 42. rn Furnas volcano, São Miguel, Azores. Contributions to Mineralogy and Petrology...Petrology 167, 986. 419-441. rn Kohn, M.J., 2017. Titanite petrochronology. Reviews in Mineralogy and Geochemistry...on the partitioning of trace elements between titanite and silicate melt. Geochimica et Cosmochimica |  | | Book | | national jurisdiction of four countries — Brazil, Portugal, Spain, Great Britain — have geological bibliographies...between Fernando de Noronha and the coast of Rio Grande do Norte, Brazil. (From Hidro., Min. da Marinha...same as that along the eastern sea- boards of Rio Grande do Norte, Brazil, the rainfall being somewhat greater...breccias, tuff-breccias, lapilli-tuffs, tuffs, ash and pumice beds are all present, representing a large range...vegetal covering lower down the slopes. Atalaia Grande is another spectacular phonolite mass, rising to |  | | Journal (article/letter/editorial) | | silica-saturated and -undersaturated compositions. At Latera, pumice fragments in the same deposit can exhibit up to...eutectic mineral assemblages with high percentages of titanite, apatite, and melanite garnet as accessory minerals...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 |  | Wolff, J.A., Ellis, B.S., Ramos, F.C., Starkel, W.A., Boroughs, S., Olin, P.H., Bachmann, O. (2015) Remelting of cumulates as a process for producing chemical zoning in silicic tuffs: A comparison of cool, wet and hot, dry rhyolitic magma systems. Lithos, 236. 275-286 doi:10.1016/j.lithos.2015.09.002 | Journal (article/letter/editorial) | | many trace phases such as allanite, chevkinite, titanite and zircon are dependent on melt compositional...pyroclastic units, compositions are those of single whole pumice clasts, or an average of several clasts. In the...and three smaller alkaline units. All consist of pumice fallout deposits and ignimbrites; fallout volumetrically...allanite, chev = chevkinite, zirc = zircon, tt = titanite, ap = apatite-group minerals, mt = titanomagnetite...given in Table 1. Both phonolitic units contain titanite, which has high mineral/melt partition coefficients |  | 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...clinopyroxene, titanomagnetite, ilmenite, haüyne, titanite, apatite and traces of plagioclase and amphibole...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 |  | | Book | | Regional Geology Reviews Siegfried Siegesmund Miguel Angelo Stipp Basei Pedro Oyhantçabal Sebastian...springer.com/series/8643 Siegfried Siegesmund Miguel Angelo Stipp Basei Pedro Oyhantçabal Sebastian...Göttingen Germany Miguel Angelo Stipp Basei Geosciences Institute University of São Paulo São Paulo Brazil...Damara and Gariep belts of southern Africa with the Ribeira Belt of South America, and to interpret their evolution...On the other hand, the Río de la Plata and Congo-São Francisco cratons were already amalgamated by c. |  | Valério, Cristóvão da Silva, Macambira, Moacir José Buenano, Souza, Valmir da Silva, Dantas, Elton Luiz, Nardi, Lauro Valentim Stoll (2018) 1.88 Ga São Gabriel AMCG association in the southernmost Uatumã-Anauá Domain: Petrological implications for post-collisional A-type magmatism in the Amazonian Craton. Lithos, 300. 291-313 doi:10.1016/j.lithos.2017.12.001 | Journal (article/letter/editorial) | | Accepted Manuscript 1.88Ga São Gabriel AMCG association in the southernmost Uatumã-Anauá Domain: Petrological...Luiz Dantas, Lauro Valentim Stoll Nardi , 1.88Ga São Gabriel AMCG association in the southernmost Uatumã-Anauá...journal pertain. ACCEPTED MANUSCRIPT 1 1.88 Ga São Gabriel AMCG association in the southernmost Uatumã-Anauá...Geosciences Institute, Federal University of Rio Grande do Sul, 91501-970, Porto Alegre, RS, Brazil *...and Hf isotopes of alkali-calcic A-type granites (São Gabriel Granite, Mapuera SC Suite) and related |  | | Journal (article/letter/editorial) | | developed circa 750-650 Ma, that include the Ribeira, Dom Feliciano, Damara and Gariep belts in southern...accessory minerals are epidote, apatite, quartz, titanite, calcite and opaques. Close to thrust fault zones...to 10 vol. O h ) and the accessory minerals are titanite, apatite and opaques. The acidic rocks are mainly...tremolite chlorite + biotite + sericite +quartz + titanite Basic rocks albite + chlorite + epidote k actinolite...actinolite + epidote + chlorite + albite + quartz + titanite + calcite + opaque minerals hornblende f actinolite |  | | Journal (article/letter/editorial) | | interaction and ore ¯uid generation at Aljustrel, Portugal Received: 1 February 1997 / Accepted: 30 July...Lisbon, EdifõÂ cio C2, Piso 5, Campo Grande, 1700 Lisboa, Portugal W.S. Fyfe Department of Earth Sciences...fragment in QET, interpreted tentatively as ¯attened pumice; D aggregate of sericite (with some chlorite) resembling...apatite, allanite and Fe-Ti oxides (containing titanite) also occur, as well as often abundant interstitial...calcite, and very rare greenish brown stilpnomelane, titanite, pyrite, chalcopyrite and sphalerite. Fluorite |  | | 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) | | Subordinate volcaniclastic facies include the pumice-rich breccia facies association, rhyolite – dacite...minerals to assemblages of chlorite + sericite, titanite and ilmenite, and uncommon epidote. Structure... the S1 cleavage is visible in some facies. In pumice-rich clastic facies, the S1 cleavage occurs as...crenulated a compaction fabric defined by flattened pumice fragments. In the coherent facies, S1 is very weak...rocks. In the eastern part of the Ural Range, a quarry (435737E 6303817N) has exposed pervasively clay- |  | Pinho, Marcia A.S.B., Chemale, Farid, Van Schmus, W.Randall, Pinho, Francisco E.C. (2003) U–Pb and Sm–Nd evidence for 1.76–1.77 Ga magmatism in the Moriru region, Mato Grosso, Brazil: implications for province boundaries in the SW Amazon Craton. Precambrian Research, 126 (1) 1-25 doi:10.1016/s0301-9268(03)00126-8 | Journal (article/letter/editorial) | | Instituto de Geociências, Univ. Federal do Rio Grande do Sul, Av. Senador Salgado Filho 6863, Cantegril/Viamão-RS... The felsic rocks are pyroclastic, enriched in pumice and phenocrysts, and are characterized as crystal-rich... 2A). In this area we recognized sub-alkaline titanite–biotite– hornblende-granite (monzogranite and...Federal do Mato Grosso and Univ. Federal do Rio Grande do Sul—Brazil. The Isotope Geochemistry Laboratory...Federal do Mato Grosso and Univ. Federal do Rio Grande do Sul. Appendix A. Brief Descriptions of Samples |  | | Journal (article/letter/editorial) | | explosive cycle exhibit compositional zonation. Banded pumice occurs in most units of the third (youngest) explosive...Upper Cañadas Series), but described them only as ‘Pumice Deposits’ of variable stratigraphic position. Correlation...and 1708 respectively, and a subplinian phonolite pumice deposit was erupted from the Montaña Blanca satellite...del CRP-2 Tephrite lava (Cycle 3 basalts) Rey Pumice CRP-1 Basalt lavas Granadilla (0.57 Ma) Major...unconformity Granadilla ignimbrite Granadilla pumice ? ? Abades Ignimbrite (0.596 Ma) Cycle 2 Debris |  | Pavón Pivetta, Cecilia, Gregori, Daniel, Benedini, Leonardo, Garrido, Mirta, Strazzere, Leonardo, Geraldes, Mauro, Santos, Anderson Costa, Marcos, Paulo (2020) Contrasting tectonic settings in Northern Chon Aike Igneous Province of Patagonia: subduction and mantle plume-related volcanism in the Marifil formation. International Geology Review, 62 (15). 1904-1930 doi:10.1080/00206814.2019.1669227 | Journal (article/letter/editorial) | | Geociências, Universidade de Aveiro, 3810-193 Aveiro, Portugal c ABSTRACT ARTICLE HISTORY The northern zone...from east to west. Escape gas pipes and altered pumice fragments are common. In thin section, a brecciated...predominantly composed of lapilli, crystalloclasts, pumice and sand-sized lithic fragments. Its lower contact...consists of massive lapilli tuff with 40% flattened pumice fragments, 5% metamorphic rocks fragments of 2–4...quartz crystalloclasts (< 2 mm). Both the matrix and pumice fragments are altered to clays, the matrix shows |  | Mercer, Celestine N., Hofstra, Albert H., Todorov, Todor I., Roberge, Julie, Burgisser, Alain, Adams, David T., Cosca, Michael (2015) Pre-Eruptive Conditions of the Hideaway Park Topaz Rhyolite: Insights into Metal Source and Evolution of Magma Parental to the Henderson Porphyry Molybdenum Deposit, Colorado. Journal of Petrology, 56 (4) 645-679 doi:10.1093/petrology/egv010 | Journal (article/letter/editorial) | | abundances in quartz-hosted melt inclusions and pumice matrix glass with major element geochemistry from...40–760 ppb Ag, 690–1400 ppm Mn). Melt inclusion and pumice matrix glass chemistry reveal that the Hideaway...noteworthy discrepancy between the metal contents in the pumice matrix glass and in the melt inclusions suggests...analyses of quartz-hosted silicate melt inclusions, pumice matrix glass, and phenocrysts from the Hideaway...(Shroba et al., 2010). METHODS Sample preparation Pumice and poorly to moderately welded tuff were sampled |  | Ablay, G. J., Carroll, M. R., Palmer, M. R., Marti, J., Sparks, R. S. J. (1998) Basanite-Phonolite Lineages of the Teide-Pico Viejo Volcanic Complex, Tenerife, Canary Islands. Journal of Petrology, 39 (5) 905-936 doi:10.1093/petroj/39.5.905 | Journal (article/letter/editorial) | | (ilm), alkali feldspar (afsp), biotite (bt) and titanite (titan). Nepheline, sodalite and secondary analcite...phonolite ~1·7 ab1 phonolite tf1a phonolite pumice tf1 trachy-phonolite, phonolite pv3 phonolitic...intermediate rocks whereas kr is absent or rare, and titanite is absent from PTS phonolites (Fig. 3b). Older...yields fH2O = 950–1040 bars, whereas the associated pumice (unit tf1a) gives 1430–1570 bars. A PVS phonolite...similar to 950–1080 bars for unit mb2. Unit mb3 pumice yields 690–700 bars. 912 ABLAY et al. TENERIFE |  | | Journal (article/letter/editorial) | | | Jarinã Formation of fine‐grained subhedral titanite, anhedral opaque minerals, and prismatic apatite... essential mineralogy. Euhedral to subhedral titanite, acicular apatite, The effusive rhyodacite are...and 2.30. One zircon grain fragments of fiamme. Titanite, apatite, and zircon comprise the acces- shows...anomaly that itoids (Creporizão Intrusive Suite and São Jorge Antigo Granite) of the varies from moderate...A‐type volcanic succession values of HREE and the São Jorge Antigo Granite show lower con- are over 10 |  | | Journal (article/letter/editorial) | | earth and high field strength elements between titanite and phonolitic liquid P.H. Olin ⁎, J.A. Wolff...2011 Available online 26 October 2011 Keywords: Titanite Phonolitic magma Trace elements Partition coefficients...such as mineral–glass proximity. We then estimate titanite/melt partition coefficients for Y, Zr, Nb, REE...strongly into titanite than either light or heavy REE, and that REE partitioning behavior in titanite is reasonably...reasonably predicted by the lattice strain model. Titanite also fractionates Y from Ho, Zr from Hf, and Nb |  | | Journal (article/letter/editorial) | | Lake, Oregon, USA, in which dominant rhyodacite pumice gives way to andesitic scorias in the uppermost...clinopyroxene, amph = amphibole, bt = biotite, tit = titanite, aen = aenigmatite, chev = chevkinite, all = allanite...residua system, Q–Ne–Ks. “Bulk-rock” (BR) refers to pumice clasts where they could be extracted from ignimbrite...Glass (GL) refers to matrix glass compositions of pumice clasts or fiamme. Q = quartz, Ab = albite, Or =...ppm Zr) to tephriphonolite, with much overlap of pumice types at most stratigraphic levels; according to |  | | Report (issue) | | calcite but preserving the structure of glassy pumice, Owen place, Howard County, Ark , Enlar ged 54...54 di a meters B, P a rt of a la rge glassy pumice fragmen t entirely replaced by calcite, Owen place,...that these mine~als were derived from the admixed pumice tuff and not from the phono lite. Brown tourmaline...a fourchite With abundant augite and nephelite. PUMICE TUFF In the vicinity of Nashville, Ark., are extensive...originally formed a tuffaceous volcanic pumice. This pumice has completely lost its glassy texture and |  | | Journal (article/letter/editorial) | | Ocean that separated the Amazon craton from the São Francisco and Rio de la Plata cratons. New geochronological...West Africa) and the central Gondwanan cratons (São Francisco cum Congo, and Rio de la Plata). The collision...age, overlying glacial diamictites of the Sauce Grande Formation (Frakes and Crowell, 1969). Further age...peraluminous magmatic body that outcrops in the eponymous quarry (Grecco et al., 1997). The fluorite-bearing granite...from outcrops ca. 300 m outside the Cerro Colorado quarry. The fine-grained texture of these granites relative |  | | Report (volume) | | Combinations of opaque oxide minerals, apatite, titanite, and zircon are present as accessory minerals...Ti02; and Zr, La, Ce, and Nd indicate apatite, titanite, and zircon, respectively, as additional phases...percent plagioclase, 36 percent fresh biotite, and pumice clasts. 90BDR012 Sora Puncu. Dacite tuff of Ignimbrite...orthopyroxene, trace to 1 percent clinopyroxene, and pumice in a dense glassy matrix. Baker and Francis (1978)...fresh biotite, 1-2 percent altered hornblende, and pumice in glassy matrix. 90BDR035 Mina Eskapa. Dacite |
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Pumice quarry, Ribeira Grande, São Miguel, Azores, Portugal