 | | Report (chapter) | | Distribution and significance of basaltic eruptive centres: São Miguel, Azores T. FERREIRA1,2*, A. GOMES1...Mãe de Deus, 9500 – 321 Ponta Delgada, Açores, Portugal 2 Centro de Informação e Vigilância Sismovulcânica...Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal 3 Department of Earth Sciences, University College...(e-mail: teresa.jl.ferreira@azores.gov.pt) Abstract: Basaltic volcanism occurs at all the active volcanic systems...São Miguel. For the last 30 ka, the eruption of basaltic magma has been particularly significant in the |  | | Report (chapter) | | evolution of Sete Cidades Volcano, São Miguel Island, Azores G. QUEIROZ1*, J. L. GASPAR1, J. E. GUEST2†, A....Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal 2 Department of Earth Sciences, University College...Cidades was the most active central volcano in the Azores with 17 explosive eruptions predominantly with...km from the average depth of the seafloor of the Azores Platform, Sete Cidades volcanic massif is located...the east occurred through the development of the basaltic fissure volcanism associated with the PFVS. Current |  | | Book | | Volcano Sicily THE ATLANTIC 10 22 30 Portugal: the Azores 35 39 42 43 43 44 Sao Miguel Sai1ta Maria...Maria Terceira Graciosa Sao Jorge Pico Fa.i.al Flores a11cl Corvo Bibliography 44 Etna 51 Pantelleria... Iceland, and the Azores vvithin the European umbrella, although two of the Azores and half of Iceland...volcanoes are in intensive care, whereas those in the Azores, for instance, have undeservedly progressed little...AD 874, and no human being even settled in the Azores until 1439. But there are historical records and | | | Book | | Salina Seamounts Vulcano THE ATLANTIC Portugal: the Azores 35 39 42 43 43 44 44 Sao Migt1el Santa...Santa Maria Terceira Graciosa Sao Jorge Pico Faial Flores and Corvo Bibliography Sicily Etna Pantelleria... Iceland, and the Azores withi11 the European umbrella, although two of the Azores and half of Icela11d...of the atmospheric elements, and settled in the Azores until 1439. the different strengths of the rocks...accl1rate dates in intensive care, whereas those in the Azores, of eruptions are only just becoming available |  | | Book | | national jurisdiction of four countries — Brazil, Portugal, Spain, Great Britain — have geological bibliographies...... du clees el 2s. Card oe er ene Basaltic Facies Non-Basaltic =. 2.» e+e BSc Sedimentary: Rocks...seemed likely that such a small percentage of basaltic liquid as would be obtained by the fractional...700 200 300 km Okm S The highest point is Pico, 321m, near the village of Remedios. This phonolitic...abundant everywhere, even on the summits — except Pico, whose spine is too steep to support plant life |  | | Journal (article/letter/editorial) | | widespread in California during the Miocene, and tuff, flows, and intrusions are fairly common in the...dacite Cherty shales, sandstone, dark clay shales, tuff, agglomerate, and a few flows Dark olive, clay shales...shales, gray and yellow sandstones, and tuff, with sills of diabase. There are a few layers of andesite...should be mentioned is tin aim^-a complete absence of tuff in the Miocene formation- ant immediately associated...divided into two formations in southern California the Pico and the Saugus. They are separated by an unconformity |  | | Report (issue) | | .......................................... 39 Basaltic rocks ..........................................west and north. The region is dotted by scattered basaltic lava flows and plugs. Many of the flows cap remnants...protected from erosion by late-Cenozoic hard caps of basaltic lava which form tablelands or mesas 200 to 300...are limited to the southwestern corner and to the Pico Pintado, a narrow butte in the northwestern corner...Morrison formation. These beds crop out only in Pico Pintado Mesa, an outlier of a 400-foot basalt-capped |  | Neumann, E.-R., Wulff-Pedersen, E., Simonsen, S. L., Pearson, N. J., Marti, J., Mitjavila, J. (1999) Evidence for Fractional Crystallization of Periodically Refilled Magma Chambers in Tenerife, Canary Islands. Journal of Petrology, 40 (7) 1089-1123 doi:10.1093/petroj/40.7.1089 | Journal (article/letter/editorial) | | chain (Fig. 1). The oldest exposed units are the ‘Basaltic Shields’ which form three deeply eroded massifs...the NE. These shields are dominated by alkali basaltic lavas, although their upper parts include evolved...extrusion of basanites to phonolites formed the Teide–Pico Viejo volcanic complex inside the Las Cañadas caldera...et al., 1998). A series of lava flows (mostly basaltic; 0·87–0·56 Ma) form the dorsal ridge between the...Anaga massif (Ancochea et al., 1990). Both the Teide–Pico Viejo complex and many flank vent systems on the |  | | Report (issue) | | of siltstone. and R. F. YERKES Andesitic and basaltic flows as much as 200 feet thick overlie the Topanga...eastern Puente Hills of 3,800 feet. A bed of basaltic tuff that is 10 to 15 feet thiek occurs in the member...the Fernando formation of Pliocene age. The terms Pico formation and Repetto formation are not applied...welded tuff containing piedmontite. In the Puente Hills and Santa Ana Mountains, this welded tuff has been...includes a 3-inch pebble of distinctive red "'elded tuff containing piedmontite. UPPER EOCENE TO LOWER MIOCENE |  | | Report (volume) | | political subdivision of a municipality; cerro, hill; pico, peak; quebrada, stream; rio, river; sierra, mountain...generously supplied unpublished geological data on the Pico La Mina area, El Yunque quadrangle. E. Aguilar-Cortez...volcanic sandstone and volcanic breccia (or between tuff and lapillistone) is 2 mm (millimeters). Volcanic...N. X 219,200 E., El Yunque quadrangle. SC-969. Basaltic lava, Guaracanal Formation, 60,040 N. X 206,660...870 N. X 207,650 E., Gurabo quadrangle. SG-8. Basaltic andesite, Martin Gonzalez Lava, 68,840 N. X 202 |  | | Book | | connotations for most workers. In this way, a “lapilli tuff” may be considered suggestive of a primary origin...(Plate I, 4). Given its low viscosity, bubbles in basaltic melt collapse shortly after fragmentation, and...charac- Figure 1.4. Undulating tuff bed (see under the pen) from a tuff ring erupted in 1913 in West Ambrym...5. Dune bedded lapilli tuff succession (upper part of the section) of a tuff ring erupted in 1913 in...grain sizes as core terms, such as ash and lapilli tuff. The basic core terms loosely follow the major size |  | | Report (issue) | | (d-) centi- (c-) milli- (m-) micro- (µ-) nano- (n-) pico- (p-) femto- (f-) atto- (a-) 1012 109 106 103 102...rhyolite flow-dome deposits of lavas and associated tuff (Palache and others, 1944). Sn a1 a2 b Figure...includes production from the Neves Corvo Mine in Portugal, which is the leading producer of tin in Europe...million metric tons of tin (Sainsbury, 1969b). Portugal and Spain.—An 800-km-long belt of tin- and tungsten-bearing...tungsten-bearing deposits that extends southeastward through Portugal and Spain is associated with dominantly porphyritic |  | | Journal (article/letter/editorial) | | approximately equal volume of interbedded tuffs and tuff breccias. Among both flows and pyroclastics andesitic...the mapped area. Considerable volumes of andesitic tuff breccia containing, on the landward side, numerous...rhyolite Perlite Hornblende andesite Tuff breccia Palagonitic tuff and pillow lava Volcanic conglomerates...andesite flows Johnstone Peak tuff breccia Basaltic lava Hornblende andesite (tuff) breccia Dikes and other...volcanics from the foothills area 66 4. Johnstone Peak tuff breccia 5. Aerial view of Glendora South Hills and |  | Vedder, J.G., Wagner, H.C., Schoellhamer, J.E., Yerkes, R.F., Yenne, K.A., DeNoyer, J.M., Burford, R.O., Brown, R.D., McCulloh, T.H., Hamilton, R.M. (1969) Geology, petroleum development, and seismicity of the Santa Barbara channel region, California. Professional Paper 679. US Geological Survey doi:10.3133/pp679 | Report (issue) | | phosphatic beds as well as chert and limestone. Rhyolitic tuff and bentonite are present at the base westward from...VOLCANIC ROCKS Extrusive and intrusive sequences of basaltic, andesitic, and rhyolitic composition form a significant...name "Conejo Volcanics" has been applied to the basaltic and andesitic rocks in the middle part of the...increasingly coarse and lenticular. A thin bed of vitric tuff occurs in the uppermost part; the source probably...designated "Repetto Formation." In the basin the name "Pico Formation" GEOLOGIC FRAMEWORK OF THE SANTA BARBARA |  | Rose, William I., Bluth, Gregg J.S., Carr, Michael J., Ewert, John W., Patino, Lina C., Valance, James W. - Eds. (2006) Volcanic Hazards in Central America. GSA Special Paper 412. Geological Society of America doi:10.1130/0-8137-2412-0 | Report (issue) | | A. Alvaret. 10. The youngest highly explosive basaltic eruptions from Masaya Caldera (Nicaragua): Stratigraphy...Freundt 1ll Contents 11. Fontana Tephra: A basaltic Plinian eruption in Nicaragua . ................also contain son1e fresher, non-juvenile, angular basaltic and andesitic clasts. The geon1etry of the deposit...and Halsor, this volu,ne). Pacaya Volcano The basaltic Pacaya stratovolcano, constructed neru· the southern...of 120 m. The predomjnant deposit lithology is basaltic clasts and fractured lava-flow segments from Pacaya |  | | Book (volume) | | boundary: the mid-Atlantic Compositional variation of basaltic layer 2A Ridge from the equator along the ...were almost invariably volcanogenie, particularly basaltic. Taking little apparent volcanic character...very anomalous) and the high on the flank of the Azores regional hotspot is geologic in in The examination...interpreted in Iceland being "primordial" and the Azores perhaps being recycled scour zones, debris-flow...IBERIAN 40* N o o BASIN o ^ JOSEPHINE SMT AZORES-GIBRALTAR R,DGE o o 171 * 35°N 4 SHOT LOC^f^ |  | | Book (edition) | | Rutherford and James E. Gardner Plumbing Systems Basaltic Volcanic Fields 219 Flood Basalt Provinces ...463 Meghan M. Morrissey and Larry G. Mastin Basaltic Volcanoes and Volcanic Systems 283 George P...Jon Davidson and Shan De Silva Scoria Cones and Tuff Rings 835 627 Peter W. Lipman Composite Volcanoes...Blank Article Index Archaeology and Volcanism Basaltic Volcanic Fields 1301 Geothermal Systems Ground...Ground Deformation, Gravity, and Magnetics 331 Basaltic Volcanoes and Volcanic Systems 283 Calderas |  | | Book | | de Colima. Tough climbers will want to go to El Pico de Orizaba, Mexico’s highest mountain, rising up...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...of life. Deep-sea volcanoes on Earth pour out basaltic magma in a relatively quiet, gentle manner. Photographs |  | | Book | | on shield volcanoes built up by the eruption of basaltic magmas (Fig. IV-38). The calderas may form by...susceptible to violent particulate explosion than basaltic magmas (Fig. IV-39). Some of the expelled ash...MIDDLE EARLY RHYOLITE RHYOLITE EZ3 BANDELIER TUFF mm PRE-CALDERA VOLCANICS EH] BASEMENT ROCKS...flows exposed in the far wall underlie the explosion tuff breccias which were emplaced during maar formation...Exposed Latest Basalt Flows Basaltic Tuff-breccias \ Basalt Flows .• gsh flow tuff mmTTTIlT^ mmnri Alluvium |  | | Journal (issue) | | tuffs, tuff breccias, thin flows and occasional shales, the volcanic rocks being of basaltic composition...scarce fossil sponges. 4. Thin layers of green basaltic tuff interbedded in black shale. 5. Interbedded shales...volcanic tuffs, tuff-breccias, conglomerates, and associated lava flows of generally basaltic composition...interbedded basaltic tuffs, tuff-breccias, lava-flows, and conglomeratic shales. Basaltic lavas form the...the north side of Sans Souci Point there is a thin tuff that shows interfingering with the underlying shale |  | | Report (issue) | | Évora Massif (Ossa-Morena zone, southwest Iberia, Portugal) . . . . . . . . 333 M. Francisco Pereira, J....acid + intermediate metavolcanics b metapelites, -tuff(ite)s, -volcanics Trans-Amazonian basement (Encantadas...metasedimentary rocks or by differentiation from a basaltic mantle source, but rather suggest mixing of mantle-derived...southwest of the old block of High-Atlas. An important basaltic pile unconformably overlies the Ediacaran rhyolitic...Late Neoproterozoic, and tholeiitic and alkaline basaltic in the Early Cambrian. In this article, (1) we |  | | Report (volume) | | Monte Jayuya on Cordillera Central. Overlies Cotorro Tuff except east of Rio Toro Negro, where it overlies...gently dipping andesitic and basaltic flows and minor rhyolitic breccia and tuff that crops out in southwestern...3, p. 119-121. Welded trachytic, crystal, vitric tuff, consisting of a lower black lenticular zone of...Stark and others (1949) described outcrops of this tuff as trachyte flows and included them in Balfour Formation...pumiceous vitric tuff overlain by welded vitric tuff, locally underlain by water-laid tuff, in part one cooling |  | | Book | | . . . . . . . . . . . . . . 342 Formation of Basaltic Melts by Partial Melting of Peridotite in Earth’s...Rock-Forming and Economic Minerals . Fig. 2.6 Pyroxene (basaltic augite), big phenocryst in basalt; besides, a...gravel ↔ conglomerate 5 volcanic ash ↔ volcanic tuff In non-geological literature on metals and ceramics...biggest occurrence is Disko Island, Greenland, where basaltic magma penetrated lignite of Tertiary age. During...crystals, dispersed in oceanic basalts. When a basaltic lava flow is cooled below the Curie temperature |  | | Report (volume) | | east of Abingdon, Knox County, Ill. Abiquiu Tuff Abiquiu Tuff Member (of Santa Fe Formation) Miocene: North-central...937 (fig. 4), 944-952, 958. Consists of streamlaid tuff and volcanic conglomerate, with a few small interbedded...extension of water-laid volcanic debris named Abiquiu tuff by Smith ( 1938). Abiquiu ( ? ) is as much as 1...proposed. Rhyolitic ash and pumice, now Bishop welded tuff, were erupted in interval between Aeolian Buttes...235. Sherwin till is pre- rather than post-Bishop tuff. Name Aeolian Buttes till should be considered invalid |  | | Report (volume) | | mapped an area near Icabaru that contains rhyolitic tuff of the Early Proterozoic Cuchivero Group and sandstone...interstratified, porphyritic, tholeiitic and calc-alkalic basaltic to rhyolitic lava flows and tuffs in the middle...interflow sediments. Turbiditic graywacke, pelite, tuff, chemical sedimentary rocks, and volcaniclastic...make up about 75 percent of the igneous rocks, basaltic andesite and andesite flow rocks about 17 percent...Formation, where they are parallel to subparallel with basaltic lava flows of this formation. The maximum thickness |
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