 | | Report (chapter) | | ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha...Cunha Barry L. Weaver, David A. Wood, John Tarney and Jean Louis Joron Geological Society, London, Special...ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha...David A. Wood, John Tarney and Jean Louis Joron S U M M A R Y: Basaltic and hawaiitic lavas from the S...Atlantic Ocean islands of Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha have been analysed for |  | | Journal (article/letter/editorial) | | Contributions to Mineralogy and Petrology Contrib. Mineral. Petrol. 66, 9 1 - 104 (1978) 9 by Springer-Verlag...Group Division of igneous rocks into subalkalic and alkalic groups was made first by Iddings (I892)....Harker (1896, 1909). By his thesis, the subalkalic and alkalic groups represent two large branches of igneous...includes rocks ranging from basic to acidic composition and represents a genetic series. The tectonic conditions...subalkalic and alkalic branches were regarded (by mistake) as being characteristic of the Pacific and Atlantic |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 61 (1982) 73-84 Elsevier Scientific Publishing Company, Amsterdam...material in the mantle from Sr, Nd and Pb isotope investigations R.S. Cohen and R.K. O'Nions Department of Earth...1982 Revised version receivedJuly 29, 1982 Pb, Nd and Sr isotope compositions of oceanic basalts have been...isotopic compositions of Sr, Nd and Pb, together with U, Pb, Sin, Nd, Rb, and Sr abundances have been determined...back-arc basalt glasses from the Scotia Sea and Parece Vela and West Philippine Basins, in addition to basalts |  | | Report (chapter) | | Geochronology (Ar/Ar and K– Ar) of the South Atlantic post-break-up magmatism M. C. GERALDES1*, A. MOTOKI1...integrates the available geological information and geochronology data for the Cretaceous– Recent magmatism...onshore and offshore magmatic events, including the oceanic islands along the transform faults and near...igneous rocks and their tectonic settings allows new insights into the evolution of the African and Brazilian...a common characteristic of almost all Brazilian and West African marginal basins. However, rocks ascribed |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 34 (1977) 13-22 © Elsevier Scientific Publishing Company, Amsterdam...IN 143Nd/144Nd AND 87Sr/S6Sr RATIOS IN OCEANIC BASALTS 1 R.K. O'N1ONS, P.J. HAMILTON and N.M. EVENSEN Lamont...precision of ! 2 - 3 × 10 -.5 (2 o). Ocean island and dredged and cored submarine basalts are included for...exists between 143Nd/144Nd and 87Sr/86Sr ratios in basalts from Iceland and the Reykjanes Ridge, but such...the Hawaiian Islands. However, when other ocean island basalts from the Atlantic are included there is |  | | Journal (article/letter/editorial) | | Isotope and Trace Element Variations in Volcanic Rocks From the Mid-Atlantic by R. K. O'NIONS and R. J ...together with determinations of Rb, Sr, K2O, Na2O and, in a few cases, other elements, are reported for...basalts from the Reykjanes Ridge and Charlie Gibbs Fracture Zone, and an enstatite-forsterite basalt from...tholeiites have uniformly low "Sr/^Sr ratios (0'70294±4) and lithophile element contents compared with the most...has not been confirmed. In contrast, the ocean island alkali basalts generally have higher "Sr/^Sr ratios |  | | Journal (article/letter/editorial) | | Lavas and Associated Plutonic Inclusions of Ascension Island by CHRIS HARRIS1 Dept. of Geology and Mineralogy...in revisedform 5 May 1983) INTRODUCTION Ascension Island is a large composite volcano situated at approximately...the South Atlantic Ocean (Fig. 1). The Island is 98 km2 in area and represents the uppermost portion of...March 29, 2014 ABSTRACT The lavas and pyroclastics of Ascension Island contain a suite of plutonic inclusions...range from alkali-basalt through hawaiite, trachybasalt, trachyandesite and trachyte to comendite. Basalt |  | | Journal (article/letter/editorial) | | 2089^2120 2010 doi:10.1093/petrology/egq050 Shona and Discovery Aseismic Ridge Systems, South Atlantic:...ANTON LE ROEX1*, CORNELIA CLASS2, JOHN O’CONNOR3 AND WILFRIED JOKAT4 1 DEPARTMENT OF GEOLOGICAL SCIENCES...Ridge^Meteor Rise^Agulhas Ridge^Cape Rise seamounts) and the Discovery Rise to the north have been argued...to represent the surface expressions of the Shona and Discovery mantle plumes, based on enriched samples...Mid-Atlantic Ridge, a single sample from Discovery Rise and tectonic reconstructions. Leg PS69 ANT XXIII/5 of |  | | Journal (article/letter/editorial) | | Contr. Mineral. and Petrol. 36, 33--48 (1972) 9 by Springer-Verlag 1972 Evolution of La Palma, CanaryArchipelago...A. K. M i d d l e m o s t Department of Geology and Geophysics The University of Sydney, Sydney 2006...northwestern island in the Canary archipeIago. The island is volcani- cally active and in recent years...eruptions (1949 and 1971). The oldest rocks that crop out on the island are altered spilitic lavas and they are...are intruded by numerous dykes and a number of marie and ultramafic plutonic rocks. These rocks form part |  | Weis, D., Demaiffe, D., Cauet, S., Javoy, M. (1987) Sr, Nd, O and H isotopic ratios in Ascension Island lavas and plutonic inclusions; cogenetic origin. Earth and Planetary Science Letters, 82 (3) 255-268 doi:10.1016/0012-821x(87)90200-7 | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 82 (1987) 255-268 Elsevier Science Publishers B.V., Amsterdam -...Netherlands 255 [4] Sr, Nd, O and H isotopic ratios in Ascension Island lavas and plutonic inclusions; cogenetic...2, ,, D. D e m a i f f e 1, S. C a u e t 1 , . . and M. J a v o y 2 1 Laboratoires Associ$s G$ologie-...January 13, 1987 Eighteen basic rocks from Ascension Island (South Atlantic) give a mean S7Sr/86 Sr ratio...both volcanics and plutonic inclusions. The late-stage differentiated rocks (rhyolites and granitic inclusions) |  | | Report (chapter) | | Characterization of the St Helena magma source D. J. Chaffey, R. A. Cliff and B. M. Wilson Geological Society...on August 18, 2014 Characterization of the St Helena m a g m a source D. J. Chaffey, R. A. Cliff & B...isotope and trace-element data for St Helena are interpreted in terms of changing thermal and chemical...chemical fluxes impinging on and interacting with the base of the lithosphere over a period of 6 Ma. The data...two geochemically distinct components in the St Helena source region: (i) a HIMU (high U/Pb) component |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 118 (1993) 101-119 Elsevier Science Publishers B.V., Amsterdam ...[CL] Kerguelen Archipelago revisited: geochemical and isotopic study of the Southeast Province lavas D...D. Weis a,1 F.A. Frey b, H. Leyrit c and I. Gautier a a Laboratoires Associ~s G~ologie, P~trologie...Brussels, Belgium b Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology...a 20-22 Ma old lower Miocene series with basalts and trachytes belonging to a mildly alkaline series comparable |  | | Report (volume) | | Carlton Victoria 3053, Australia DISTRIBUTORS USA and Canada Blackwell Scientific Publications Inc PO Box...granted by The Geological Society for libraries and other users registered with the Copyright Clearance...Typeset, printed and bound in Great Britain by William Clowes Limited, Beccles and London Library of...metasomatism--perspective and prospect vii ix 1 MENZIES, M. Alkaline rocks and their inclusions: a window...experimental studies 29 LE Bhs, M. J. Nephelinites and carbonatites 53 TWYMAN, J. D. & GITTINS, J. Alkalic |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 62 (1983) 273-282 Elsevier Scientific Publishing Company, Amsterdam...The Netherlands 273 [5] Pb isotopes in Ascension Island rocks: oceanic origin for the gabbroic to...compositions and U and Pb concentrations of the lava series (alkali basalt to comendite) and of their plutonic...xenoliths (gabbro to alkaline granite) of Ascension Island are reported. The data are used to evaluate...the acidic and intermediate xenoliths together with most of the lavas on the one hand, and the gabbroic |  | | Journal (article/letter/editorial) | | silicate melt inclusions in Ascension Island granite xenoliths J. D. WEBSTER1,* and C. R. REBBERT2 1 Department...Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West at 79th...alkaline volcanic rocks of Ascension Island were analyzed for 29 major, minor, and trace elements. For most...are similar to those of the volcanic whole rocks and the xenoliths; we interpret the glasses to be chemically...alkaline; contain low S and P abundances; and are enriched in H2O, Cl, F, and Na relative to K. Inclusions |  | | Journal (article/letter/editorial) | | Mineralogy and Petrology 9 by Springer-Verlag 1976 Petrology, Volume and Age Relations of Alkaline and Saturated...Peralkaline Volcanics from Terceira, Azores Stephen Self* and Bernard M. Gunn Department of Geology, Imperial College...Azores group; three contain both basaltic and peralkaline and one only peralkaline rocks. A recently active...active basaltic fissure zone trends NW-SE across the island. The rocks fall into the alkaline olivine basalt...lavas of the oldest volcano and in some recent fissure zone basalts and hawaiites; 2) saturated, found |  | | Journal (article/letter/editorial) | | Earfh and Plonera~ Science Letters, 60 ( 1982) 79-85 ElsevierScientific Publishing Company. Amsterdam...composition of lead and strontium in lavas and coarse-gained blocks from Ascension Island, South Atlantic...Atlantic C. Harris, J.D. Bell and F.B. Atkins Department of Geology and Mmeralogv, University of Oxford, Parks...May 13, 1982 New Sr and Pb isotope data are presented for a selection of lavas and associated coarse-grained...coarse-grained blocks from Ascension Island. K-Ar dates for the lavas range up to 1.5*0.2 Ma. Initial “‘Sr / |  | | Journal (article/letter/editorial) | | Origin of Differentiated Volcanic and Plutonic Rocks from Ascension Island, South Atlantic Ocean A. KAR1∗...KAR1∗, B. WEAVER1, J. DAVIDSON2 AND M. COLUCCI3 1 SCHOOL OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF OKLAHOMA...OKLAHOMA, NORMAN, OK 73019, USA 2 DEPARTMENT OF EARTH AND SPACE SCIENCES, UNIVERSITY OF CALIFORNIA LOS ANGELES...magmatism on Ascension Island, in the form of trachyte and rhyolite domes, coulées, lava flows, and pyroclastic...deposits, created the central and eastern parts of the island between about 1·0 and 0·56 my ago. The geochemical |  | | Journal (article/letter/editorial) | | Mineralogy and Petrology Contrib Mineral Petrol (1985) 91:74-81 9 Springer-Verlag1985 Hydrogen and oxygen...geochemistry of Ascension Island lavas and granites: variation with crystal fractionation and interaction...interaction with sea water* Simon M.F. Sheppard and Chris Harris** Centre de Recherches P~trographiques et G6ochimiques...Vandoeuvre-l~s-Nancy, France Abstract. Lavas and pyroclastics on Ascension Island contain plutonic blocks that include...ratios, F and C1 have been analysed on whole rocks and/or minerals for lavas and granites, and D/H ratios |  | | Journal (article/letter/editorial) | | composition of xenoliths from the oceanic crust and volcanic edifice beneath Gran Canaria (Canary Islands):...sediments and altered Jurassic MORB from Gran Canaria (Canary Islands) represent samples of sub-island oceanic...for crustal contamination of basaltic and felsic ocean island magmas. The meta-igneous rocks show great...is lower than MORB (5.7 – 6.0x ). Layer 2 lavas and dykes show a broader range of d18O of 4.1 – 8.6x...the dominant process in layer 3, while both high- and low-temperature alteration have variably affected |  | Klingelhöfer, F., Minshull, T.A., Blackman, D.K., Harben, P., Childers, V. (2001) Crustal structure of Ascension Island from wide-angle seismic data: implications for the formation of near-ridge volcanic islands. Earth and Planetary Science Letters, 190 (1) 41-56 doi:10.1016/s0012-821x(01)00362-4 | Journal (article/letter/editorial) | | Earth and Planetary Science Letters 190 (2001) 41^56 www.elsevier.com/locate/epsl Crustal structure...structure of Ascension Island from wide-angle seismic data: implications for the formation of near-ridge volcanic...Southampton Oceanography Centre, School of Ocean and Earth Science, European Way, Southampton SO14 3ZH...important for understanding how such islands form and how the lithosphere deforms beneath them. Studies...to smaller islands, which are more common. Ascension Island, a 4-km high volcanic edifice with a basal |  | | Journal (article/letter/editorial) | | NEKVASIL1*, Justin FILIBERTO2, Francis M. MCCUBBIN1, and Donald H. LINDSLEY1 1Department 2Lunar of Geosciences...University, Stony Brook, New York 11794–2100, USA and Planetary Institute, 3600 Bay Area Boulevard, Houston...January 2006) Abstract–Detailed analysis of cumulate and melt inclusion assemblages in the chassignites provide...olivine (and, by extension, parental magma compositions), the pressures of crystallization, and magmatic...silica-saturated alkalic lavas on Earth (e.g., Ascension Island, Azores, the Nandewar volcano of Australia) |  | | Book (volume) | | THE OCEAN BASINS AND MARGINS Volume | The South Atlantic THE OCEAN BASINS AND MARGINS Volume 1:...The North Atlantic Volume 3: The Gulf of Mexico and the Caribbean Volume 4: The Mediterranean Volume...Ocean ‘THE OCEAN BASINS AND MARGINS, A. Edited by-AlanjE. M. Nairn and Francis G. Stehli Department...de Geociéncias e Astronomia and Centro de Pesquisas Geocronolégicas da Universidade de Sao Paulo, Brazil...Instituto de Geociéncias e Astronomia and Centro de Pesquisas Geocronolégicas da Universidade de Sao Paulo, Brazil |  | | Journal (article/letter/editorial) | | Contr. l~iineral, and Petrol. 44, 85--100 (1974) 9 by Springer-Verlag 1974 Petrology and Geochemistry of...of Easter Island P. E. B a k e r * a n d F. B u c k l e y Department of Earth Sciences, University of...Durham Received November 13, 1973 Abstract. Easter Island has developed around three volcanoes Poike, an...strato-volcano, Rano Kau, a caldera, and the fissure complex of Terevaka and its associated cones. The lavas...from tholeiites and olivine *holeiites to hawaiites, mugearites, benmoreites, trachytes and rhyolites (comendites) |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 72 (1985) 141-148 141 Elsevier Science Publishers B.V., Amsterdam...phosphatic amygdales in gabbroic inclusions from Ascension Island Chris Harris * Department of Earth Sciences...Sciences, Parks Road, Oxford OX1 3PR (U.K.), and C.N.R.S., C.R.P.G., B.P. 20, 54501 Vandoeuvre-les-Nancy Cedex...pyroclastic sediment on Middleton's Ridge, Ascension Island, have large negative Ce anomalies (Ce*/Ce...(Ce*/Ce up to 5). Along grain boundaries and in the interstices between the cumulus minerals, quenched intercumulus |
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