 | | Journal (article/letter/editorial) | | Petrogenesis of the volcanic suite of Bouvetøya (Bouvet Island), South Atlantic TORE PRESTVIK, STEVEN GOLDBERG...Petrogenesis of the volcanic suite of Bouvetøya (Bouvet Island), South Atlantic. Norsk Geologisk Tidsskrift...to the volcanic istand of Bovetøya (close to the Bouvet Triple Junction) are discussed and compared with...with previously published data from the island. The rock types, hawaiite, benmoreite, and peralkaline trachyte...rocks are !hose of a moderately enriched oceanic island suite. On several isotope plots Bouvetøya rocks |  | | Journal (article/letter/editorial) | | are: sanidine 31.5 45.3; fayalite 0.02 0.22; hedenbergite 3.3 6.3; amphibole 12; biotite 72; ilmenite...fayalite to 12 in chevkinite-(Ce). Coefficients for hedenbergite, ilmenite and titanomagnetite decrease as melts...increases in rocks with <1 wt.% MgO. Data sources: Bouvet Island Le Roex and Erlank (1982); Fantale Gibson (1972);...mol.%). The pyroxene phenocrysts are generally hedenbergite (~Ca43.4Mg3.5Fe53.1). Unlike the other phenocrysts...alkali feldspar 9.8; quartz 4.0; fayalite <0.1; hedenbergite 0.8; FeTi-oxide 0.1; chevkinite(Ce) <0.1. R |  | | Journal (article/letter/editorial) | | 2 -3.6 65.5 82.3 8.2 9.5 Spec. 1. Ascension Island, Atlantic. Scarce phenocrysts of alkali felspar...felspar ( < 1.0 %). (No. 15,375). Spec. 2. Bouvet Island, Atlantic. Scarce phenocrysts of anorthoclase ( <...< 1.0% ). (No. B2). Spec. 3. Bouvet Island. Phenocrysts of alkali felspar Or~0 (2.5%). (No. W T 18B)....Spec. 4. Easter Island (Motu Iti), Pacific. Aphyrie (No. 17,525). Spec. 5. Easter Island (Rana Kau), Pacific...microphenoerysts of (?) zircon. (No. 17,518). Spec. 6. Easter Island (Cero Orito), Pacific. Aphyric. (No. 17,691). Spec |  | | Journal (article/letter/editorial) | | 26(1-2) 115-134 Israel, geochemistry 31(3-4) 103-124 Norway 36( 1) 5 l-66 Pacific Coast, geochemistry 23( l-2)...I IS-132 Arkansas, geochemistry 26( 1-2) 67-98 Norway 17(2) 153.170;22(2)99-112 Portugal, Cretaceous...23(3) 179-200 alstonite 8(3) 199-207 althausite Norway, phosphates 8(3) 215-219; 12(4) 288 aluminosilicates...37(2-3) 181-197 amber mica see phlogopite Ambittle Island geochemistry 12(3) 173-186 amphibole group see...magmas 15(4) 281-293 metamorphic rocks 2( 1) 67-81 Norway geochemistry 30(2) 167-189; 32( 1-2) 2145 igneous |  | | Journal (article/letter/editorial) | | terms of their normative contents of diopside-hedenbergite-enstatite-ferrosilite. From the analytical data...fractions of Table 3 in the system diopside(Di), hedenbergite (Hd), clino-enstatite (En), clino-ferrosilite...the Mid-Atlantic Ridge in the system diopside-hedenbergite-clinoenstatite-clinoferrosilite. Rocks shown...Maitre (1962) for the alkaline basalts of Gough Island. Of the other trace elements the rocks appear to...study of the rocks forming the volcanic islands and island groups, nearly all in the South Atlantic, that |  | Moreno, J.A., Molina, J.F., Bea, F., Abu Anbar, M., Montero, P. (2016) Th-REE- and Nb-Ta-accessory minerals in post-collisional Ediacaran felsic rocks from the Katerina Ring Complex (S. Sinai, Egypt): An assessment for the fractionation of Y/Nb, Th/Nb, La/Nb and Ce/Pb in highly evolved A-type granites. Lithos, 258. 173-196 doi:10.1016/j.lithos.2016.04.020 | Journal (article/letter/editorial) | | juvenile crust formed by protracted accretion of island-arc terrains (e.g., TE Bentor, 1985; Stern, 1994... amphibole + dark mica reaction rims and of hedenbergite with reverse Fe/Mg zoning (see Moreno et RI...porphyry M-40A also presents CGM grains included in hedenbergite xenocrysts (Fig. 2E). In peralkalaline granite...grains from groundmass (cognate) and included in hedenbergite xenocrysts show distinct compositions, tending...e., xenocrystic, for the grains included in hedenbergite. 4.2.3. Monazite Monazite analyses present analytical |  | | Journal (article/letter/editorial) | | and Associated Plutonic Inclusions of Ascension Island by CHRIS HARRIS1 Dept. of Geology and Mineralogy...revisedform 5 May 1983) INTRODUCTION Ascension Island is a large composite volcano situated at approximately...14°W in the South Atlantic Ocean (Fig. 1). The Island is 98 km2 in area and represents the uppermost...ABSTRACT The lavas and pyroclastics of Ascension Island contain a suite of plutonic inclusions which range...HM side of the FMQ reaction curve. ASCENSION ISLAND LAVAS 425 Fernando Po » Principe Sao Tome • Annobon• |  | | Journal (article/letter/editorial) | | patches, and the Ferich one to aggregates of hedenbergite, magnetite, and accessory phases. The mesostases...Hill, Bouvet Island, S. Atlantic 104831 Olivine basalt Christensen Nunatak, Robertson Island, Graham...face, Krakatau 11648 Basaltic andesite Late Island, Tonga Islands. Samples 5-69, 20-69, and 21-69...(1972) Alkali basalt Christmas Harbour, Kerguelen Island. See Table 2, No. 23. British Museum sample BM...West side of North Bay, Cumberland Bay, Kerguelen Island. See Table 2, No. 24 British Museum sample BM 75103 |  | | Report (volume) | | Geochemistry of ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and...lavas and associated granite xenoliths of Ascension Island 269 FITTON, J. G. The Cameroon line, West Africa:...very rare and not so clearly defined as in ocean island chains, probably because the continental lithosphere...deep mantle plumes as suggested for the Hawaiian island chain (Clague). The entire convecting upper mantle...produces MORB (Fitton). Geochemical studies on ocean island basalts from the South Atlantic Introduction |  | | Report (issue) | | closely connected with comenditic rocks. On Easter Island, for Nl INTRODUCTION PETROGENETIC IMPORTANCE OF...Foerstner (1881) for alkali rhyolites from the island of Pantelleria in the Mediterranean, and Washington...(1913), in a redescription of the rocks from the island, introduced the term "hyalopantellerite" for the...for alkali rhyolites from Le Comende, San Pietro Island, Sardinia. Both comendites and pantellerites from...pyroxene (which, when analyzed, appears to be sodic hedenbergite), aenigmatite, and quartz in a groundmass of |  | | Book | | y . '/. SILALI '\" .... ~ '" :\. 3" S~U:jH ISLAND \, :: :e;d~A:. K:. . 4" --......I' 0..' !...23, TE 6; 8 tholeiitic basalts (suite 4, Idjwi island, Lake Kivu), ME 10, TE 7; 9 transitional basalts...transitional basalts (suite 3, Quaternary, Idjwi island, L. Kivu); 17 melilitite (suite 1 B), sample VM234...Fields for MORB (Mid-Ocean Ridge Basalt), OIB (Ocean Island Basalt), kimberlites (KT 1 = group I; KT2 = group...(NHRL on Fig. 5) that includes MORB and OIB (Ocean Island Basalts). Instead, they occupy the same domain |  | | Book | | three categories: those of (1) ocean basins; (2) island arcs and continental margins; and (3) continents...underlie much of the inaccessible ocean floor. The island arcs and orogenic con¬ tinental margins are the...Hawaii Galapagos Reunion Comoro Islands Marion Island 2 5 4 1 1 Continental intraplate volcanism East...Geological map of the northern part of Macquarie Island (after Griffin and Varne 1980). 5 Igneous activity...crust may be seen above sea-level is Macquarie Island, situated 1100 kilometres south-west of New Zea¬ |  | | Book | | Benioff seismic zone heavy rare-earth elements island-arc tholeiite wt.% K 2 0 in a series at a silica...100Mg/(Mg + F e ) mid-ocean ridge basalt oceanic-island tholeiite primordial hot mantle plume dimensionless...fundamental styles. (1) Nesosilicates (Gr. nesos, an island), the S1O4 tetrahedra are not linked directly to...M g S i 0 3 , enstatite C a F e S i 2 0 6 , hedenbergite pyroxenes -Si03 (a) single chain of tetrahedra...Pyroxenes wollastonite ( e ) diopside ( e ) hedenbergite ( e ) enstatite ( e ) ferrosilite ( e ) Jadeite |  | | Book | | Arcs 7.2.1 Island Arc Magmatism 7.2.2 Continental Arc Magmatism 7.2.3 Structure of Island and Continental...2.4 Examples of Island and Continental Arcs 7.3 Petrographic Characteristics of Island and Continental...Continental Arc Rocks 7.3.1 Petrography of Island Arc Rocks 7.3.2 Petrography of Continental Arc Rocks 7.4 Geochemical...Arc Differentiation Trends 7.4.2 Comparison of Island and Continental Arc Magma Series 7.4.3 Comparison...magma chamber (light-colored rock), north central Norway 4.1 Diagram showing the behavior of compatible |  | | Report (issue) | | and related rocks from Westland and Otago, South Island, New Zealand . Barbara A. Barreiro and Alan F....volcanism in oceanic and continental settings; Clarion Island versus the eastern Trans-Pecos magmatic province...seamounts, and transforms—but are also associated with island arcs and ophiolites. The following summary of symposium...carbonatites, lam¬ prophyres, and related rocks of South Island, New Zealand, had a mantle source that also experienced...Alkaline magmatism has been recognized increasingly in island arc settings. Perfit reported that alkalic rocks |  | | Book | | past tectonic environments (e.g. mid-ocean ridge, island arc) from the compositions of ancient igneous rocks;...subduction-related volcanic rocks is shown in Fig. 1.6. In many island arcs, the potassium content of volcanic rocks increases...0 tion 55 ssocia line a -alka calc Low-K (island 50 line o ass sociation arc tholeiite) as 60...tectonic environments on Earth (e.g. mid-ocean ridges, island arcs, back-arc basins, intraplate oceanic islands...basalt’ (often abbreviated to ‘MORB’) and ‘ocean-island basalt’ (OIB) being obvious examples. As we shall |  | | Book (edition) | | subfiles E and N. See symposia. Ada County Adak Island In central part of Aleutian SW of Alaska Peninsula...Australia Australia SA geosynclines Adelaide Island Off W coast of Antarctic Peninsula S of Cape Horn...Islands aegerine use aegirine Aegina Town and island in Saronic Gulf. BT Sterea Ellas Greece aegirine...waste disposal Agto Fishing settlement on small island in Davis Strait. BT Greenland Arctic region SA...BT Gulf of Mexico Alae Crater Kilauea volcano on island of Hawaii. BT Hawaii United States SA Kilauea |  | | Book (edition) | | U.S. BA United States NA Columbia Kentucky Adak Island In central part of Aleutian Islands SW of Alaska...Australia SA geosynclines SA Stuart Shelf Adelaide Island Off W coast of Antarctic Peninsula S of Cape Horn...Islands aegerine use aegirine Aegina Town and island in Saronic Gulf. BT Sterea Ellas BT Greece aegirine...international cooperation Agto Fishing settlement on small island in Davis Strait. BT Greenland BT Arctic region...Gulf of Mexico Alae Crater On Kilauea Volcano on island of Hawaii. Autoposting of broader terms to this |  | Shagam, R., Hargraves, R. B., Morgan, W. J., Houten, F. B. Van, Burk, C. A., Holland, H. D., Hollister, L. C. - Eds. (1972) Studies in Earth and Space Sciences. GSA Memoir 132. Geological Society of America doi:10.1130/mem132 | Report (issue) | | Acknowledgments Geotectonics Origin of Lithosphere behind Island Arcs, with Reference to the Western Pacific .Ralph...133 Paleomagnetism of Anorthosite in Southern Norway and Comparison with an Equivalent in Quebec.R....Harvey Deep-Water, Shallow-Water, and Subaerial Island-Arc Volcanism: An Example from the Virgin Islands...basalt; he not only brought out the elegant order of island-arc geology but proposed a dynamic mechanism to...grapple with the other fields (gravity anomalies and island arcs, pyroxenes, plagioclases, layered complexes |  | | Report (volume) | | Latvia Lithuania Scandinavia (Ge Denmark. Icela Norway Sweden 1 Q Q 65 67 69 69.2 69.3 69.4 72 72...General works By country, island, or region, A-Z Subarrange each country or island by Table Q4 South America...General works By country, island, or region, A-Z Subarrange each country or island by Table Q4 Europe General...General works By country, island, or region, A-Z Subarrange each country or island by Table Q4 Asia General...General works By country, island, or region, A-Z Subarrange each country or island by Table Q4 Africa General |  | | Book (edition) | | Ireland Tourist Board) Figure 1.2 Fingal's Cave, Island of Staffa, west of Mull, Scotland. (Paul Pepper...responsible for the Murchison earth¬ quake of 1929, South Island, New Zealand. The uplifted block rose about 5 metres...the generation of igneous activity; a volcanic island arc is formed. On the other hand if one of the...Characteristic examples NESOSILICATES or Island Silicates (Gr. nesos, an island) Separate Si04 tetrahedra, held...Hypersthene (Mg,Fe)Si03 Diopside CaMgSi206- Hedenbergite CaFeSi206 Jadeite NaAlSi206 (Si4our AMPHIBOLE |  | | Book | | Giant’s Causeway in Antrim, and Fingal’s Cave on the island of Staffa in the Hebrides. More than 90% of vol-...the Middle East, and the Mediterranean. (Cf. > Island arc distribution.) Submarine earthquakes occur...iron and manganese. Typical minerals include hedenbergite and Fe-hypersthene (% Pyroxenes), fayalite and...This was first described from the Fen district in Norway and the term fenite (the process is fenitisation)...Femic; > Mafic.) _Ferrosilite. ® Pyroxenes. : An > island arc. 175 (SE. Toa<8, >. Ia fe geet pies 59 |  | | Book | | 1972 ISBN 82 00 02253 6 Distribution offices NORWAY BLINDERN, OSLO 3 UNITED KINGDOM CANNON HOUSE, PARK...STATES BOX 142 BOSTON, MASS. 02113 Printed in Norway by Aas & Wahl, Oslo Foreword The important part...Alexander Island . 149 M. R. A. Thomson: Ammonite faunas of south¬ eastern Alexander Island and their...migration and tec¬ des Peninsula, King George Island, South Shet¬ tonic control of Upper Cenozoic volcanism...deposits from Bahia Chile [Discovery Bay], Greenwich Island, South Shetland Islands 75 O. Gonzalez-Ferran |  | | Journal (volume) | | MORB may be related to the activity of oceanic island basalts and continental flood basalts. Therefore...1913 rift-edge phreatomagmatic eruption, Ambrym Island, Vanuatu Németh, K.* & Stewart, R.B. INR-CS, Volcanic...Oslo, Norway (*andreas.beinlich@fys.uio.no) 2 Dept. of Earth Sciences, University of Oslo, Norway In contact...peridotite clasts from the Devonian Solund Basin, SW Norway. These clasts show evidence for a stepwise reaction...Fossum, J.O. Dept. of Physics, NTNU, Trondheim, Norway (*zbigniew.rozynek@ntnu.no) Pálková, H.1*, Jankovič |  | | Journal (volume) | | Scotland, A. Geieie Quaternary Carnivores found on the island of Malta: Excavation by Glaciers: Chamberlin on...XLII. Note on some Volcanic Rocks from Gough's Island, . South Atlantic by L. V. Pirsson 380 XLIII. Champlain(...Paleobotany of the Cretaceous Formation on Staten Island, A. Hollick: Organization of the Fossil Plants...Scotland. 13. Quaternary Carnivores found on the island of Malta. Until recently the known extinct Quaternary...by Brogger from the eleolite-syenite of southern Norway but among them will be found such species 16. |
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