 | | Journal (article/letter/editorial) | | L C R Y S T A L L I Z A T I O N IN B O U V E T ISLAND LAVAS ANTON P. LE ROEX and A.J. E R L A N K Departments...crystallization in Bouvet Island lavas. J. Volcanol. Geotherm. Res., 13:309---338. Bouvet Island, situated near...more evolved compositions) to give rise to the Bouvet Island rhyolite. Extensive fractional crystallization...hawaiite to mugearite, suggesting that the Bouvet Island hawaiites correspond in composition to a six...crystallization on this surface. INTRODUCTION Bouvet Island (lat. 54°26'S, long. 3°25'E) is situated near |  | | 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) | | 2 -3.6 65.5 82.3 8.2 9.5 Spec. 1. Ascension Island, Atlantic. Scarce phenocrysts of alkali felspar...(No. 15,375). Spec. 2. Bouvet Island, Atlantic. Scarce phenocrysts of anorthoclase ( < 1.0% ). (No. B2)...B2). Spec. 3. Bouvet Island. Phenocrysts of alkali felspar Or~0 (2.5%). (No. W T 18B). Spec. 4. Easter Island...Island (Motu Iti), Pacific. Aphyrie (No. 17,525). Spec. 5. Easter Island (Rana Kau), Pacific. Very scarce...microphenoerysts of (?) zircon. (No. 17,518). Spec. 6. Easter Island (Cero Orito), Pacific. Aphyric. (No. 17,691). Spec |  | | Journal (article/letter/editorial) | | Sigmond, E. M. 1977: The deoiogy and petrology of Bouvet~ya, south Atl;mtic Ocean. Lithos 10, 213-234, Oslo...Oslo. ISSN 0024-4937. The Quaternary island Bouvetoya is situated near the triple junction on the South...address: Geologisk Institutt, N-7034 Trondheira.NTH, Norway. Bouve,tOya is situated at the southern end of...and triple junctions, e.g. Ascension and Easter Island (Baker 1973), and their genesis has been attributed...of the present knowledge of the geology of the island together with further petrological study, which |  | | Journal (article/letter/editorial) | | clinopyroxene, magnetite and plagiocfase with anorthoclase rims. Trachytes elsewhere in the volcano at...flows provide strong evidence that rimmed by anorthoclase. the processes attendant with the origin of...et al. (1981). D values for plagmlase (PC), anorthoclase (Am), apatite cpg, clinopyroxane (cpx) and magnetite...xpEp for the assemblage 39% plagioclase, 33% anorthoclase, 16% clinoovroxene. melt 10% magnetite. and...any ation assemblage of 39% plagioclase, 33% anorthoclase, 16% chnopyroxene, 10% magnetite, and 2% amount |  | | Journal (article/letter/editorial) | | (IF), Crater of the Moon National Monument (COM), Island Park (IP), and Yellowstone caldera (I/) 165 ...groundmass. Phenocrysts include alkali feldspar (anorthoclase to sodic sanidine), quartz, andesine, ferroaugite...zircon and apatite. Glomeroporphyritic clots of anorthoclase, ferroaugite, pigeonite, and ilmenite are quite...mineralogical disequilibrium includes c o m m o n anorthoclase rims on plagioclases of the more sodic group...bas. Plagioclase An32-35 > 1% K20 3% volume anorthoclase rims AnzT-32 1-2% K20 small volume resorbed |  | | Report (issue) | | Sandwich Island (SSI) phenocryst variability from Pearce et al. (1995). Bouvet Island anorthoclase phenocryst...Fractional Crystallization Beneath the South Sandwich Island Arc, Journal of Petrology, 36(4), 1073-1109. Schweitzer |  | | Journal (article/letter/editorial) | | volcanic activity, both in continental and oceanic island environments. The Nandewar Volcano in north-eastern...per cent phenocrysts of clinopyroxene, calcic anorthoclase, sanidine, plagioclase, titanomagnetite, apatite...trachytes carry sparse phenocrysts of calcic anorthoclase and sanidine, clinopyroxene, ± titanomagnetite...carry up to 15 volume per cent phenocrysts of anorthoclase or sanidine. Although these volcanics are pervasively...varieties of limited volumetric extent. Sanidine or anorthoclase is the only phenocryst phase in all rhyolitic |  | | Journal (article/letter/editorial) | | M n O TiO2 - . - 2.12 62.8 2.51 - . Anorthoclase P . - 0 6.79 7.33 - 66.9 19.23 0.41 71...P1 Anr Sa olivine clinopyroxene plagioclase anorthoclase san9 Hbl Amp Qtz Mag Ap hornblende alkali...rhyolite (comendite) Clinopyroxene Amphibole Anorthoclase Sanidine Magnetite Apatite Quartz Stage IV ...trachyte Olivine Clinopyroxene Plagioclase Anorthoclase Amphibole Magnetite Apatite Stage III Eu 0...(comendite) to high-silica rhyolite (comendite) Anorthoclase Sanidine Clinopyroxene Magnetite Quartz Amphibole |  | | 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)...Yemen lO(3) 185-191 alkali feldspar see ulso anorthoclase; antiperthite; K-feldspar; microcline; microperthite;...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 |  | | Journal (article/letter/editorial) | | 1990 Geochemistry of highly-undersaturated ocean island basalt suites from the South Atlantic Ocean: Fernando...with those in basaltic and hawaiitic OIB (ocean island basalt) lavas from other South Atlantic islands...1984]; Kaula, Hawaii [Garcia et al. 1986]; Ross Island, Antarctica [Sun and Hanson 1976; Kyle 1981]; East...within-island, comparable to that displayed 503 worldwide by O I B suites. Ascension and Bouvet islands...are generally similar to those o f Ascension and Bouvet (Weaver et al. 1987) in spite o f significant isotopic |  | | Report (chapter) | | flows of the Kilombe volcano contain blebs of anorthoclase-phyric benmoreite within trachyte (Jones 1979b)...high viscosity, which was perhaps due to the anorthoclase phenocrysts, and were discriminated against...Fig. 2. The generalized trend for the oceanic Bouvet Island basalt-comendite sequence is also shown (Imsland...Lake Rudolf region, II, The lavas of North Island, South Island and the Barrier. Lithos, 4, 305-23. CLAGUE...SIGMOND, E. M. 1977. The geology and petrology of Bouvet~ya, south Atlantic Ocean. Lithos, 10, 213-34. JOHNSON |  | | Journal (article/letter/editorial) | | Springer-Verlag 1974 Petrology and Geochemistry of Easter Island P. E. B a k e r * a n d F. B u c k l e y Department...Durham Received November 13, 1973 Abstract. Easter Island has developed around three volcanoes Poike, an...are concentrated in the southwestern part of the island on or around Rano Kau. The basaltic rocks, which...level. P r e v i o u s geological work on t h e island includes accounts b y Chubb (1933), L a c r o i...Baker et al. Previous sketch m a p s of t h e island (e.g. B a n d y 1937, p. 1590) show a m i x t u |  | | Book | | Transformation Twinning in Alkali Feldspars 18.3.1 Anorthoclase . . . . . . . . . . . 18.3.2 Orthoclase and...monoclinic-triclinic symmetry change. The term anorthoclase roughly corresponds to inverted high albite...prior to inversion to triclinic symmetry. An anorthoclase Or2sAb6sAn7 from a camptonite dyke at Posina...with substantial Na,K substitutional disorder (anorthoclase De Pieri and Quareni 1973, low sanidine G E...Dark-field micrograph of andesine, An 32 , from Kragem, Norway, imaged with (123) pair of e diffractions with |  | | Book | | 277, 279 281 283 283 284 284 Chapter 14: Gough Island . . . 286 286 286 287 287 289 302 304 305 Geology...the nearest mainlands. Of the fourteen islands-island groups mentioned, not all are what are generally...Iherzolitic and dunitic peridotites of Timor, Réunion Island and Piedmont, Italy. He therefore affirmed that...taken from WasxincTon of similar deposits from Norway (No. 3) and France (No.4). Specimen No.2 gave...specimen) 2. St. Paul Rocks. (WasHINGTON specimen) Norway. ee a ; ee oe rom Mauillac, Quercy, The Institute |  | | 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 |  | | 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 |  | Caroff, M., Maury, R.C., Leterrier, J., Joron, J.L., Cotten, J., Guille, G. (1993) Trace element behavior in the alkali basalt-comenditic trachyte series from Mururoa Atoll, French Polynesia. Lithos, 30 (1) 1-22 doi:10.1016/0024-4937(93)90002-t | Journal (article/letter/editorial) | | Tuamotu Archipelago. It belongs to a linear volcanic island chain extending from Pitcairn to Duke of Gloucester...and QTa); (7) zircon; (8) potassic feldspar (anorthoclase); ( 9 ) aenigmatite (in CTc ). The same minerals..., Carter, R.M. and Coobs, D.S., 1974. Pitcairn Island~another Pacific hot spot? Nature, 251: 679-682...recycled lithosphere as the mantle source of ocean island basalts from Southern Polynesia, Central Pacific...1988. Trace element evidence for the origin of island basalts: an example from the Austral Islands (French |  | | 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 | | 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 |  | | Book (volume) | | Atlantic Baker I. Introduction... .. . II. The Island Groups . . . ba A. Group 1. Mildly Alkaline to...by the actively volcanic Tristan da Cunha—Gough Island Group and its trace during sea-floor spreading...geophysical results and augmented by dredge hauls, island exploration, etc., have been predicated on the...stratigraphic test was drilled on the volcanic island of Santa Barbara. been drilled in the offshore...2-CST-1-BA. The well 2-SB-1-BA drilled on Santa Barbara Island on the Abrolhos bank penetrated lava layers related |  | | 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 |  | | Book | | 292) Prior GT (1900) On aegirine and riebeckite anorthoclase rocks related to the "grorudite-tinguaite" series...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 |  | | 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...to produce the familiar sanidine (and rarer anorthoclase) phenocrysts of certain lavas. At lower temperatures...cryptoperthite perthitic orthoclase microcline anorthoclase C a A l 2S i 20 8 N a A l S i 30 8 A n 90 A |  | | Report (issue) | | Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania...Corsica. Spain. Portugal. Azores. Spitzbergen. Norway. Sweden. Finland, Kola. Germany: Westphalia, Rhineland...many books on the geology of various suggests the Island of Rhodes rather than the State of regions, books...books of travel, and other volumes were Rhode Island. Warren's name root is adopted in V.. searched for...Proceedings ........................................ NORWAY. Geologisk Undersogelse, Publica.tions ...... |
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