 | | Journal (article/letter/editorial) | | geochemistry on the semi-arid Atlantic island of Porto Santo Maria Teresa Condesso de Melo a, Raghwendra...Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal Madeira Rochas, Avenida Arriga 75, Conjunto Monumental...Infante, Apartamento 506, 9000 - 060, Funchal, Madeira, Portugal GEOBIOTEC, Geosciences Department, University...Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal d Dept. of Geochemistry, GEUS, Øster Voldgade...chemistry of the semi-arid volcanic island of Porto Santo, part of the Madeira archipelago, Atlantic Ocean, |  | | Journal (article/letter/editorial) | | Minerals, (2010) 45, 77–86 Bentonite from Porto Santo Island, Madeira archipelago: surface properties studied...Chemistry Department, University of Madeira, 9000-390 Funchal, Portugal, and 2 GeoBioTec, Research Centre...Department, University of Aveiro, 3810-193 Aveiro, Portugal (Received 20 March 2009; revised 8 December 2009;...two distinctive bentonite samples from Porto Santo Island, Madeira archipelago. In view of their potential...Bentonite occurs in several outcrops in Porto Santo Island, Madeira archipelago, and is characterized by |  | | Journal (article/letter/editorial) | | shown mueh less interest. From Jan Mayen to Bouvet Island we have a most impressive literature dealing with...35~ 25 ~ --40~ ; @. AZORES" -- ~. __3o~ C MADEIRA ~ , f ([" ~ SELVAGENS -" , t .r.p i ~" CANARIES...Quaternary. Unquestionably the most interesting island as regards sedimentary rocks is Maio. Here occur...coast of the E - - W trending eastern part of the island, SOA~ES (Tom~Es & SOARES, 1946) had identified...without more ado this indication of Malm in the island, but all 1185 Aufs~itze things considered, we |  | | Journal (article/letter/editorial) | | argillaceous schists, interlaminated with auriferous quartz. These schists constitute the author's "great auriferous...decomposition from the edges of the auriferous slates and quartz-rock, and to exist under various conditions of...months in Madeira, Sir C. Lyell had an opportunity of examining a considerable portion of the island, and...geological structure of Madeira and the neighbouring islands of Porto Santo and Baxo. In nearly all his...origin to the great mass of the volcanic rocks of Madeira. Some of the earlier igneous formations were submarine |  | | Journal (article/letter/editorial) | | Georgia has the Scotia Sea to the S, but as this island has a more truly oceanic setting, is little known...descends S of Barbados to rise towards Tobago, which island is surrounded by waters ca. 90 m deep, shallowing...1000 m isobath enclosing the archipelago. The Madeira islands have steep descents down to 1000 m, more...monotonous series of quasihorizontal sandstones, quartz-conglomerates and quartzites, along with problematical...referring to Coronation Island in the S. Orkneys, but the latest work on this island, that of THOMSON(1974) |  | | Journal (article/letter/editorial) | | extraction pathways and stagnation depths beneath the Madeira and Desertas rift zones (NE Atlantic) inferred...February 2004 Ó Springer-Verlag 2004 Abstract The Madeira and Desertas Islands (eastern North Atlantic) show...zones which intersect near the eastern tip of Madeira (São Lourenço peninsula). We applied fluid inclusion...suggest a multi-stage magma ascent beneath the Madeira Archipelago: main fractionation occurs at multiple...Fax: +49-421-2189460 two adjacent rift systems: Madeira and the Desertas may represent either a two-armed |  | | Journal (article/letter/editorial) | | trachy-andesites and trachytes dredged during the ‘‘Tore Madeira’’ cruise of the Atalante in 2001. The ages reveal...volcanism in the northern section of the Tore-Madeira Rise, which occurred 20–30 m.y. after opening of...signatures are different from Atlantic MORB, the Madeira Archipelago and the Azores, but they lie in the...lie in the northern and central part of the Tore-Madeira Rise, which extends over about 1000 km in SW–NE...ages and Pb–Sr–Hf isotopes from northern Tore-Madeira Rise 4951 713 km NORTH AMERICAN PLATE Mid-A |  | Ferreira, M.P., Macedo, R., Costa, V., Reynolds, J.H., Riley, J.E., Rowe, M.W. (1975) Rare-gas dating, II. Attempted uranium-helium dating of young volcanic rocks from the madeira archipelago. Earth and Planetary Science Letters, 25 (2) 142-150 doi:10.1016/0012-821x(75)90190-9 | Journal (article/letter/editorial) | | I U M DATING OF YOUNG VOLCANIC ROCKS FROM THE MADEIRA ARCHIPELAGO M.P. FERREIRA, R. MACEDO, V. COSTA...Departamento de Geologia, Umversidade, Coimbra (Portugal) and J.E. RILEY, Jr.** and M.W. ROWE Department...25 whole-rock basalts from Madeira and Porto Santo islands in the Madeira Archipelago. We include petrographic...even less of its radiogenic helium (30%) than the island basalts. 1. Introduction The u r a n i u m - h...whole-rock basalts from Madeira (MAD) and Porto Santa (PS) islands in the Madeira Archipelago. Thin sections |  | | Journal (article/letter/editorial) | | active basaltic fissure zone trends NW-SE across the island. The rocks fall into the alkaline olivine basalt...basaltic parental magma. 1. Introduction The island of Terceira is one of nine volcanic islands of...to be extinct. The most recent activity on the island was the eruption of hawaiite lava from the fissure...which consists of two series: sodic rocks (e.g. Madeira, Hughes and Brown, 1972) and potassic rocks (e...examined in detail as the volcano-stratigraphy of the island is well known (Self, in press). Alkali basalt and |  | | Journal (article/letter/editorial) | | (2004) 81: 85–111 DOI 10.1007/s00710-004-0029-5 Madeira Island alkaline lava spinels: petrogenetic implications...Universidade de Lisboa, Faculdade de Ci^encias, Lisboa, Portugal Received May 17, 2002; revised version accepted...Four groups of spinels have been identified in Madeira Island alkaline basalts: 1) Alrich chromian-spinels...log( f O2)NNO 1.8) during crystallisation from Madeira alkaline magmas. Pressure does not seem to have...crystallisation sequences during polibaric fractionation of Madeira magmas. Introduction Notwithstanding their minor |  | | Journal (article/letter/editorial) | | from, their phonolitic host magma (Wolff, 1987). Quartz syenite nodules ejected during the 5000-year-old...convective velocities of residual melt. The Azores island group emerges from the Azores Platform, a topographic...(Laughton & Whitmarsh, 1974). The island of Sao Miguel belongs to the eastern island group, and straddles the...showing the location of the Azores island group. The inset is the island of Sao Miguel, showing the location...location of Agua de Pao volcano. The island of Sao Miguel can be subdivided into six volcanic zones (Moore |  | | Journal (article/letter/editorial) | | have been dredged as far south as the A/ores and Madeira. Bradley believes that they may have been transported...major rock types in the ATLANTIS collection— Porto Santo X X X X X X X X X X X X X X X X X X X...these are not filled, some contain aggregates of quartz, chlorite, epidote, or zeolites. 7 PETROGRAPHY...glass. Chlorite, calcite, iddingsite, serpentine, quartz, and hematite are present in some specimens in...obtained from station 20 consists almost entirely of quartz and epidote, with traces of fine-grained magnetite |  | | Journal (article/letter/editorial) | | Maim, most certainly Neocomian, are present in the island of Male, and here are found the highest dips and...L1sBo. ,,~.,' r . ,,' ,o " p o. . . . . ' ~ t MADEIRA,'~" .' r ,J /'-P.o" ~" - , / . / ' - ".--c'...disposition of the mountain ranges-peaks within each island exert climatic controls. Thus, for example, on...Quaternary Holocene to Neocomian or Portlandian ? Island ;G ~ roa n d e = o Carneiro Cima Cape Verde Islands...BEBIANO never managed to land on Fogo and study this island well-known for its active vulcanism. Again we had |  | | Journal (article/letter/editorial) | | peridotite and enriched pyroxenite source for Madeira magmas: Insights from olivine Andrey A. Gurenko...2013 Available online 15 March 2013 Keywords: Madeira Islands Partial melting Recycling Olivine Peridotite...Reaction pyroxenite a b s t r a c t The Madeira and Canary island/seamount chains represent two adjacent...lavas covering the entire volcanic history of the Madeira Archipelago (~0–5 Ma). We demonstrate that Ni ×...pyroxenite-derived melt fractions in the parental Madeira magmas were inferred from olivine compositions |  | | Journal (article/letter/editorial) | | / / / S K A E R G A A R D ~ O M x l MOON / ! MADEIRA- ~\ ~ LAKE -\ xx. ~" \ RANGE x~ , 40...documented: Alae lava lake, Hawaii [42] ; Madeira and Porto Santo lavas [43] ; Skaergaard late liquids [44]...877-886. 15 S.S. Sun and G.N. Hanson, Origin of Ross Island basanitoids and limitations upon the heterogeneity...Integrated models of basalt petrogenesis: a study of quartz tholeiites to olivine melilitites from southeastern...M. Weibel, Chemical study of rocks from Madeira, Porto Santo, and Sa-o Miguel, Terceira (Azores), Neues |  | | Journal (article/letter/editorial) | | Vasconcelos, Ed. Cl, 5° piso, 1749-016 Lisboa, Portugal 2Instituto de Qufmica Flsica "Rocasolano", CSIC...Benavila, Alentejo, Portugal (BEN) and one from Porto Santo, Madeira archipelago, Portugal (PTS). Representative...remaining material being calcite and traces of quartz and feldspar. Carbonates were then removed, the...Integradas HP1996-0043 and HPI998-0034 and to CRUP (Portugal) for the Ac, |  | | Book (volume) | | Lowe on the arrival of a flight of locusts in Madeira ......... 425 Mr. Darwin on some cases of abnormal...eruptions—concluded. Volcanic Eruption in Iceland in 1783—New Island thrown up—Lava Currents of Skaptar Jokul, in same...of Galongoon in Java—Submarine Volcanos—Graham Island, formed in 1831 —Volcanic Archipelagos—Submarine...1730-36—Santorin and its Volcanic Eruptions —Barren Island in the Bay of Bengal—Mud Volcanos—Mineral Composition...Cutch in 1819—Subsidence in the Delta of the Indus—Island of Sumbawa in 1815—Earthquake of Caraccas in 1812—Shocks |  | | Journal (article/letter/editorial) | | distribution of different water types in Portugal (including Madeira and the Azores) H.G.M. Eggenkamp ⁎, J...(UTL, Lisbon), Av. Rovisco Pais, 1049-001Lisboa, Portugal a r t i c l e i n f o Article history: Received...online 20 June 2013 Keywords: Water classification Portugal Hydrogeochemistry Geochemical mapping a b s t...were applied to classify all mineral waters in Portugal from which chemical analysis were found in the...the general classification of mineral waters in Portugal the empirical techniques are most usable as newly |  | | Journal (article/letter/editorial) | | three active Quaternary stratovolcanoes on the island (Fig. 1b). The origin of alkaline/peralkaline salic...alkaline/peralkaline salic rocks in the oceanic island environment. Geological Setting The Azores islands...in the Atlantic approximately 1,400 km west of Portugal (Fig. 1a). The islands straddle the Mid-Atlantic...systematically from the west to the east of the island. The visible sub-aerial portion of Sao Miguel is...(Abdel-Monem et al. 1975) occur at the eastern end of the island and are associated with a fourth volcano, Povoacao |  | | Report (chapter) | | Sedimentation on the Madeira Abyssal Plain over the last 300 000 years P. P. E. Weaver & R. G. Rothwell...Rothwell S U M MARY: The sediments of the Madeira Abyssal Plain consist of thick turbidites (up to 5 m) separated...32~ and 23~ and 26~ in the central part of the Madeira Abyssal Plain was one of the sites chosen for investigations...Laughton (1966) from the Madcap area in the southern Madeira Abyssal Plain. A series of cruises to the area...stands of sea level. However, the resolution of the Madeira Abyssal Plain study is much greater, and what appear |  | | Journal (article/letter/editorial) | | there must have been, durwith beautiful crystals of quartz and calcite. Our party ·was ing the period of general...exist while tbe forests ametbyst and ferruginous quartz. It is a matter worthy of gl(,ew and matured; water...district subject to such intense the case of the smoky quartz of the Pike's Peak region, irr volcanic action...down to allow with chalcedony or other forma of quartz. On reachipg- theneavily oedded conglomerates of...section thrown out such enormous masses as in the island of St. Domingo. Here a mountain more than niue |  | | Journal (article/letter/editorial) | | t e / l i t h o s On the composition of ocean island basalts (OIB): The effects of lithospheric thickness...metasomatism a b s t r a c t We have examined island-averaged geochemical data for 115 volcanic islands...fractionation effect to Mg# = 0.72, we found that the island-averaged Si72 and Al72 decrease whereas Fe72, Mg72...first-order control on the geochemistry of ocean island basalts (OIB). Variation in initial depth of melting...compositional variation on a given island, between islands and between island groups. The OIB mantle source |  | Machado, Adriane, Chemale, Farid, Conceição, Rommulo V., Kawaskita, Koji, Morata, Diego, Oteíza, Orlando, Van Schmus, William R. (2005) Modeling of subduction components in the Genesis of the Meso-Cenozoic igneous rocks from the South Shetland Arc, Antarctica. Lithos, 82 (3) 435-453 doi:10.1016/j.lithos.2004.09.026 | Journal (article/letter/editorial) | | Gonçalves, 9500, Campus do Vale, Agronomia, 91501-970, Porto Alegre, RS, Brazil b Department of Geology, University...rights reserved. q Keywords: Subduction; Fluids; Island arc magmas; Pb isotopes; Nd isotopes; Sr isotopes...rights reserved. doi:10.1016/j.lithos.2004.09.026 Island arcs are central to the understanding of mantle...Machado et al. / Lithos 82 (2005) 435–453 typical island arc rocks, which constitute the bulk of the worldwide...western Livingston Island (Byers Peninsula, Fig. 2), southeastern Greenwich Island (Fort Point, Fig. 3) |  | | Journal (article/letter/editorial) | | minerals from the veins. Main gangue minerals are quartz, calcite, rhodochrosite, chlorite, sericite and...section at Guincho Fort, the Lusitanian Basin, Portugal (30km West of Lisbon) has been studied in a detailed...bentonite and biogenic carbonate sand from island of Porto Santo, which have been traditionally used for...thermal mud from a fumarole (solfatara) field in the island of Sao Miguel, Azores archipelago, and for biogenic...silica in diatomite from in Rio Maior, Central Portugal. (R. Miyawaki) 104144 Nguyen, Q. H. & Egashira |  | Sagan, Madisen, Heaman, Larry M., Pearson, D. Graham, Luo, Yan, Stern, Richard A. (2020) Removal of continental lithosphere beneath the Canary archipelago revealed from a U Pb Age and Hf/O isotope study of modern sand detrital zircons. Lithos, 362. 105448 doi:10.1016/j.lithos.2020.105448 | Journal (article/letter/editorial) | | Fuerteventura during the shield-building stage of island growth. The absence of a highly ro depleted Hf...continental lithosphere have existed beneath the island. This lithosphere is na heterogeneous, consisting...origin and complete growth history of an ocean island is challenging because often many of the rocks...proportion of the island is obscured at depth or has been removed by erosion. Typical ocean island erosion rates...larger and easternmost oceanic islands in the Canary Island archipelago, has a mature erosional landscape (currently |
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