 | | 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) | | hedenbergite 3.3 6.3; amphibole 12; biotite 72; ilmenite 0.56 0.72; titanomagnetite 32; chevkinite-(Ce)...chevkinite-(Ce). Coefficients for hedenbergite, ilmenite and titanomagnetite decrease as melts become peralkaline...increases in rocks with <1 wt.% MgO. Data sources: Bouvet Island Le Roex and Erlank (1982); Fantale Gibson (1972);...biotite; and (3) Ga is compatible in magnetite and ilmenite, with KD up to 12. An additional factor in Ga...small CaO content (<0.20 wt.%). The FeTi-oxide is ilmenite (Xilm = 97.2 mol.%). The pyroxene phenocrysts |  | | 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) | | minerals of these rocks are apatite, magnetite, ilmenite and zircon. Potash feldspar occurs mainly associated...Titanomagnetite and ilmenite are common phases in most samples although it is probable that the ilmenite has resulted...ulvospinel). X-ray element images showed that ilmenite occurs as discrete grains (internal grain exsolution)...(Thompson et al., 1974; Ludden et al., 1980) and Bouvet Island (Verwoed et al., 1976). The evolution of all...al., 1974 Hekla andesire;Wood et al., 1979 Bouvet Island mugearite;Vewoed et al., 1976 Circum-Pacificandesites;Taylor |  | | Journal (article/letter/editorial) | | Graduate School of Oceanography, University of Rhode Island, Kingston, R.I. 02881, U.S.A. Received October...a t e d features lie some 850 k m east of Gough Island, on t h e e a s t e r n f l a n k of t h e M i...h e m o s t s o u t h e r l y island of t h e Ridge, B o u v e t Island, is 1300 k m to t h e south. T...concentric to those of T r i s t a n d a Cunha, Gough Island, a n d t h e W a l v i s Ridge. Two a t t e m p...Nightingale Island in the Tristan group is 15 m.y., whilst the average age of Gough Island is 4 m.y. and |  | | Journal (article/letter/editorial) | | pronounced old enriched signature than the Bouvet Island Hot Spot. The systematic variation of incompatible...(wyrdite), mainly c o m p o s e d of rutil and ilmenite crystals, crosscut by s i l i c a t e s (andradite |  | | Journal (article/letter/editorial) | | pronounced old enriched signature than the Bouvet Island Hot Spot. The systematic variation of incompatible...(wyrdite), mainly c o m p o s e d of rutil and ilmenite crystals, crosscut by s i l i c a t e s (andradite |  | Holm, P.M., Gill, R.C.O., Pedersen, A.K., Larsen, J.G., Hald, N., Nielsen, T.D.F., Thirlwall, M.F. (1988) Tertiary picrites of West Greenland: Petrogenetic implications of trace element & Sr-Nd isotope geochemistry. Chemical Geology, 70 (1) 49 doi:10.1016/0009-2541(88)90317-8 | Journal (article/letter/editorial) | | pronounced old enriched signature than the Bouvet Island Hot Spot. The systematic variation of incompatible...(wyrdite), mainly c o m p o s e d of rutil and ilmenite crystals, crosscut by s i l i c a t e s (andradite |  | | Journal (article/letter/editorial) | | pronounced old enriched signature than the Bouvet Island Hot Spot. The systematic variation of incompatible...(wyrdite), mainly c o m p o s e d of rutil and ilmenite crystals, crosscut by s i l i c a t e s (andradite |  | | Journal (article/letter/editorial) | | occur in Ti-rich accessory phases such as sphene, ilmenite or rutile also readily substitutes into clinopyroxene...irrespective of whether the Ti-rich accessory phase is ilmenite, ulvospinel, sphene, rutile or chevkinite-perrierite...chevkinite-perrierite. In general one or more of ilmenite, ulvospinel and sphene was present in basaltic and basaltic...Quench modification of glasses coexisting with ilmenite in an unmodified basanitic (a) 7.5 kbar \\\...representative igneous rock suites. Data for low-K (island-arc tholeiitic), talc-alkali and high-K talc-alkali |  | | Journal (article/letter/editorial) | | the Bouvet Island hotspot and between Group II kimberiites and the palaeotrack of the Gough Island hotspot...hotspot. Group I kimberlites and Bouvet Island basalts are characterized by high initial ‘43Nd/‘MNd, low...the other hand, Group II kimberlites and Gough Island basalts are characterized by low initial ‘43Nd/‘44Nd...West Africa and the palaeotrack ofthe Ascension Island non-DuPAL hotspot. The implication being that the...accessory perovskite, sulphide, chrome spinel, ilmenite, titanomagnetite, and apatite (see FAIRBAIRNand |  | | 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) | | remarkably similar to that giving rise to Gough Island lavas some 400 km to the north. All lavas dredged...composed of typical, geochemically enriched, ocean island basalt-like mantle (La/Smn 41; Ba/Nb 510; Ce/Nbn... 4 D3 A D9 45o g Rid th Sou 10o 5o 0o Bouvet 5o 10o w es 15o 20o E Fig. 1. Locality map... Ba/Nb ratios vary from those common for ocean island basalts (4·4^8) to significantly elevated values...other South Atlantic OIB, but comparable with Gough Island lavas (le Roex, 1985). The two groups of samples |  | | Journal (article/letter/editorial) | | m, University of Oslo, Sars gt. I,0562 Oslo 5, Norway (Received November 14, 199 1; accepted in revi~ed~~...lherzoliteq and QFM-0.7 for pyroxenites. Ocean island xenoliths reflect relatively oxidizing conditions;...abyssal peridot&es from the vicinity of the Bouvet island hot spot and proposed that mantle plumes are...Saga Petroleum A/S, PO Box 480, N-137 1 Sandvika, Norway. 2405 2406 H. E. F. Amundsen and E.-R. Neumann...neoblasts of clinopyroxene + spine1 + olivine f ilmenite + orthopyroxene. Pyroxenite suite xenoliths, together |  | | Journal (article/letter/editorial) | | 1974); 5, average of three benmoreites from Easter Island (Baker and others, 1974); 6, average of three "potassic..."potassic icelandites" (benmoreites) from Bouvet Island (Imsland and others, 1977); 7, average benmoreite...oxides, formed from the alteration of primary ilmenite-magnetite in the icelandite lavas. In addition... G„ 1974, Petrology and geochemistry of Easter Island: Contributions to Mineralogy and Petrology, v....and others, 1977, The geology and petrology of Bouvet^ya, s o u t h Atlantic Ocean: Lithos, v. 10, p |  | | Journal (article/letter/editorial) | | H. JOHNSTON:Jarosite and akaganeite from White Island volcano, New Zealand. An X-ray and Massbauer study...ARCULUS:Geochemistry of the Lesser Antilles volcanic island arc .............................. JEAN KING WHLTLAN:Amino...Geochemistry and petrology of dredged basalts from the Bouvet triple junction. South Atlantic. JOHN 1. HEDGES:The...and AlaOs and some structural systcmati~ among ilmenite compounds. . . . . . . . , . . . . . . . . . ...balance AlzOa, C/N ratio in deep-sea sediment AllOa, ilmenite Al,O,, MARID suite Al,O,. metal adsorption A&O |  | Campanha, G.A.C., Faleiros, F.M., Basei, M.A.S., Tassinari, C.C.G., Nutman, A.P., Vasconcelos, P.M. (2015) Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490 Ma oceanic back-arc magmatism. Precambrian Research, 266. 530-550 doi:10.1016/j.precamres.2015.05.026 | Journal (article/letter/editorial) | | mid-ocean ridge 193 basalts (MORB) and immature island arc basalts. 194 An Rb–Sr reference isochron...227 titanite, titanium oxides (Ti-magnetite, ilmenite and rutile) and apatite. 228 The amphibolite...quartz and depleted 303 in titanomagnetite and ilmenite in relation to the B3. There is no correlation...which interacts with a plume associated with Bouvet Island (Leat et al., 510 2000; Fretzdorff et al....1149 et al., 2008, 2009a,b; Fan et al., 2010), island arc and continental arc volcanics 1150 (McCulloch |  | | 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...fractionating phase along with olivine, clinopyroxene and ilmenite and/or magnetite, in proportions which are in |  | Piccirillo, E.M., Civetta, L., Petrini, R., Longinelli, A., Bellieni, G., Comin-Chiaramonti, P., Marques, L.S., Melfi, A.J. (1989) Regional variations within the Paraná flood basalts (southern Brazil): Evidence for subcontinental mantle heterogeneity and crustal contamination. Chemical Geology, 75 (1) 103-122 doi:10.1016/0009-2541(89)90023-5 | Journal (article/letter/editorial) | | (Ansi_45) , pigeonite (W012 ~), minor Ti-magnetite (ilmenite) and sporadic olivine, the latter completely altered...augite, pigeonite, a b u n d a n t Ti-magnetite and ilmenite commonly make up the groundmass. Intermediate...plagioclase, augite, pigeonite, Ti-magnetite, ilmenite and quartz. 107 T A B L E II Major- (wt.%),...(1980); SWIR (South Western Indian Ridge ) and B (Bouvet island) after Le Roex et al. {1983); and W.R. (Walvis...retention of Ta by an accessory phase (sphene, ilmenite, rutile?: Weaver and Tarney, 1983; unknown phase |  | Xia, Ying, Wang, Qing, Zhu, Di-Cheng, Ernst, Richard E., Zhang, Shuangquan, Liu, Dong, Zhao, Zhi-Dan (2020) Intermediate rocks in the Comei large igneous provinces produced by amphibole crystallization of tholeiitic basaltic magma. Lithos, 374. 105731pp. doi:10.1016/j.lithos.2020.105731 | Journal (article/letter/editorial) | | crystallization of spinel and plagioclase at 1.0 GPa and ilmenite at 0.7 GPa (Villiger et al., 2004, 2007). The...mostly exhibit geochemical affinities to oceanic island basalt (OIB) (Zhu et al., 2007, 2008). Zircon U–Pb...titanite are accessory minerals in dolerites. Ilmenite is characterized by low REE abundance (e.g., La...primary magmas, such as picrites in Hawaii and Baffin Island, are generally thought to first crystallize high-Fo...Pre-proof 59% clinopyroxene + 33% plagioclase + 8% ilmenite) from the end-product of stage 1 can generate |  | Coe, Nancy, le Roex, Anton, Gurney, John, Pearson, D. Graham, Nowell, Geoff (2008) Petrogenesis of the Swartruggens and Star Group II kimberlite dyke swarms, South Africa: constraints from whole rock geochemistry. Contributions to Mineralogy and Petrology, 156 (5) 627-652 doi:10.1007/s00410-008-0305-1 | Journal (article/letter/editorial) | | characteristic of Group I kimberlites or ocean island basalts, but indistinguishable from calc-alkaline...Although minor fractionation of a phase such as ilmenite or perovskite could account for the depletion...et al. 1996; Foley et al. 2000), the absence of ilmenite and the presence of perovskite only as a late...phases such as phlogopite and FeTi-oxides such as ilmenite, lindsleyite and rutile. 123 646 Contrib Mineral...regions. Moreover, an attraction of a phase such as ilmenite or rutile in the source would help generate Hf-Nd |  | | Journal (article/letter/editorial) | | (IF), Crater of the Moon National Monument (COM), Island Park (IP), and Yellowstone caldera (I/) 165 ...clots of anorthoclase, ferroaugite, pigeonite, and ilmenite are quite common. Alkali feldspar phenocrysts...re-equilibration U s p 6 7 - 7o 1.7-2.9% MgO Ilmenite Ilm93 95 Ihn89-98 (a) high Nb203 ca. 1% volume...grains in a given sample plus mesostasis augite, ilmenite, magnetite, and trace apatire. Olivine phenocrysts...alkali feldspar, sodic plagioclase, and Nb-rich ilmenite) suggests that these minerals are relatively unstable |  | | Journal (article/letter/editorial) | | 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...descriptions of the rocks and analyses are available from Bouvet (Broch, 1946), Gough (Le Maitre, 1962), the Tristan...(Tilley, 1947). In the northern Atlantic the only island group is the Azores, but this group lying in a...of the Quaternary and historic eruptions of the island. I. D. MUIR AND C. E. TILLEY—BASALTS FROM 426 |  | | Journal (article/letter/editorial) | | section, especially when they contain magnetite or ilmenite, can contribute to the general opacity of the...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 |
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