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| Contr. Mineral.and Petrol. 44, 101--115 (1974)9 by Springer-Verlag 1974Discovery Tablemount Basalt:...Basalt: Petrologyand GeochemistryD. R. C. K e m p eDepartment of Mineralogy, British Museum (Natural History)...Graduate School of Oceanography,University of RhodeIsland, Kingston, R.I. 02881, U.S.A.Received October...South Atlantic Ocean,has been describedand analysed,and the rare earths determined. The basalt is...a quartznormative tholeiite but mineralogicallyand chemically (including trace elements) has affinities |
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| Geochronology (Ar/Arand K– Ar) of the South Atlanticpost-break-up magmatismM. C. GERALDES1*, A. MOTOKI1...integrates the available geological informationand geochronology data forthe Cretaceous– Recent magmatism...onshoreand offshoremagmatic events, including the oceanic islands along the transform faultsand near...igneous rocksand their tectonic settings allows new insightsinto the evolution of the Africanand Brazilian...a common characteristic of almost all Brazilianand WestAfrican marginal basins. However, rocks ascribed |
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| 175-181. Primed in Great BritainVolcanism onGough Island: a revised stratigraphyJ. G. MAUND*, D. C....work onGough Island combined with K-Ar dating of the lavas requiresrevision of the ageand volcanic... Four main periods of volcanic activity on theisland arerecognized. These comprise the eruption of...Ma), voluminous trachyteextrusion (0.30-0.12 Ma)and finally to eruption of the Edinburgh Basalt (0.20-0...involving theeruption of pillow basaltsand hyaloclastites when theisland emerged from below sea level. This |
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| de LuxembourgWith 106 Figuresand 95 Tables=ein the textand on 8 FoldersGEBRUDER1970UNIV...character-ized, with scarce an exception, by vulcanism,and the yulcanological evolution, rocksuites, geomorphological...intimate acquaintance with all the Atlantic islands,and thereis every reason to believe this applies even...southern islands separate, forreasons given above,and no less to furnish a volume of reasonable magnitude...general, shownlittle interest,and indeed the American J.C. Brannerand the Belgian, A. RENARD, arethe |
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| phenocrysts fromTristandaCunhaandGough Island lavas: variation with fractional crystallizationand evidence...clinopyroxeneand plagioclase) present in lavas fromTristandaCunhaandGough Island. These islands...mantle plume, have enriched radiogenic isotope ratiosand are, therefore, prime candidates for an oxygen isotope...pyroxeneand feldspar in theGough lavas showthat the phenocrysts in the ma®cGough Island lavas are...isotope composition as MORB. Phenocrysts in all theGough lavas show a systematic increasein d18O value as |
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| 0022-3530/90 $3.00TristandaCunha, South Atlantic: GeochemistryandPetrogenesis of a Basanite-Phonolite...Lava Seriesby ANTON P. LE ROEX 1 , R. A. CLIFF 2AND B. J. I. ADAIR 11Department of Geology, University...University of Leeds, Leeds, UKABSTRACTTheisland ofTristandaCunha, located at 37°S, 12°W in the South Atlantic...islands, the others being Nightingaleand Inaccessible.TristandaCunha comprises acontinuous series of...from ankaramitic basanite throughphonotephriteand tephriphonolite to phonolite. Moderately porphyritic |
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| Geochemistry of InaccessibleIsland volcanicsR.A. ClifP, P.E. Baker b'~and N.J. Mateer ~~Departmenl o[Earth...30, 1989; revisedand accepted April 8, 1991 )ABSTRACTClift; R.A., Baker, P.E.and Mateer, N.J., 1991...InaccessibleIsland volcanics. ('hem. Geol., 92: 251-260.InaccessibleIsland, part of theTristandaCunha group...group, is older thanTristan itself but younger than Nightingale. Itcomprises an alkali basalt-trachybasalt-phonolitic...similar to but less alkaline than that ofTristan.('heroicaland isotopic analyses for a new suite of sixteen |
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| Mineralogyand Magmatic Evolutionof the Basalticand Trachytic Lavas fromGough Island, South Atlantic...AtlanticDepartments of Geologyand Geochemistry, University of Cape Town, Rondebosch 7700,South Africa...form 5 July 1984)ABSTRACTTheGough Island lavas range frompicrite basalt through to sodalite-bearing...lavas on theisland, represented by theLower Basalt series, are approximately 10 m.y. oldand the youngest...basalticand trachytic lavas with respect to bothbulk rock majorand trace element geochemistryand mineral |
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| EnglandPetrology of the Volcanic Rocks ofSaintHelenaIsland, South AtlanticAbstract: Detailed field...of the two deeply eroded shield volcanoes ofSaintHelena haspermitted a reconstruction of their growth...texturalandchemical variations from basic to salic ends of the series. Major oxide contentsand a number...of known stratigraphic position.The intermediateand trachytic rocks are believed to be derived from a...processes of crystal fractionation. Volatile transferand migration of alkali-rich late-crystallizing fluids |
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| Contr. Mineral.and Petrol. 32, 126-137 (1971)9 by Springer-Verlag 1971Evidence for the Role of Phlogopite...experimentaland petrochemical evidence suggests thatvariations of potassium, titaniumand aluminium in...inverse covariance is reeognised between titaniumand aluminium which isprobably controlled by the depth...magma segregation. The relative effects of pressureandphlogopite breakdown have been estimated for selected...in the mantle hydrous minerals such as amphiboleand mica would be expected at moderate depths,,whereas |
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| Lineagesand Fractionation Trends inUndersaturated Volcanic Rocks from the EastOtago Volcanic Province...Province (New Zealand)andRelated Rocksby D. s. COOMBSand j . F. G. WILKINSONABSTRACTThe petrology...sodic lavasand shallow intrusives whose compositions range from alkali basalt, basanite,and nephelinite...nephelinite to trachyteand phonolite.A range of relatively potassic volcanic rocks is also developed in the... The degreeof undersaturationand ratios such as (FeO+Fe2O3):MgOand K,O:Na,O vary widely inrocks with |
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| corresponding to the Departmentsof the Museum,and an Historical series.Parts will appear at irregular...will contain about three orfour hundred pages,and will not necessarily becompleted within one calendar...Antarctic TerritoryBerthaIsland, Sheehan NunatakiScullin MonolithChemistryand discussionThe Scotia...ClarenceIslandSouth Orkney IslandsInaccessible Islands(a)CoronationIsland(b)SignyIsland(c)Powell...Powelland Michelsen Islands(d)FredriksenIsland(e)(/) LaurieIslandGraptoliteIsland.(g).Basaltic |
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| Seamount Chaines in the Brazil Basin A. A. Peyveand S. G. Skolotnev Geological Institute (GIN), Russian...whole structure, includ ing the Trindadeand Martin Vaz Islandsand the Abrolhos Plateau. The analogous isotopic...explained by a similar mechanism of melt derivationand the similar evolution of the mantle plume material...Pernambuco Seamounts con sisted of a mixture of DMand HIMU material with a certain admixture of EM I (or...Atlantic is interesting thanks to its typical longand variably ori ented tectonomagmatic seamount chains |
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| THE PETROSPETROCHEMICAL DATA BANKDAVID L. BARRand FELIX E. MUTSCHLERDepartment of Geology,Eastern...Eastern WashingtonUniversity, Cheney, WA 99004,U.S.A.andOWEN P. LAVINDepartment of Geological Sciences, Queens...of interactive FORTRAN IV programs for accessingand operating on majorelement whole-rock chemical analyses...on user-supplied criteria, normativecalculationsand rock classification,graphical displays including...includinghistograms, X-Y plots, triangular plots,and various statistical analyses based on the SPSS System. |
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| Contr. Mineral.and Petrol. 43, 125--147 (1974)9 by Springer-Verlag 1974Petrology of the Ninety East...East Ridge in the Indian Ocean consist of basaltsandoceanic andesites. The basalts from the Ninety East...content ( > 11% ),higher TiO 2 content (2-3%),and variable K20 content (0.2-1.5%). Volcanics from other...aseismie ridges, i.e. the Cocos, the Iceland-Faeroeand the Walvis ridges, show a trend ofdifferentiation...The Ninety Eastand the Ieeland-Faeroe ridges contain mildly tholeiitic basaltsand oceanic andesit~s |
 | Gibson, S.A., Thompson, R.N., Day, J.A., Humphris, S.E., Dickin, A.P. (2005) Melt-generation processes associated with the Tristan mantle plume: Constraints on the origin of EM-1.Earth and Planetary Science Letters, 237 (3) 744-767doi:10.1016/j.epsl.2005.06.015 | Journal (article/letter/editorial) |
| Earthand Planetary Science Letters 237 (2005) 744 – 767www.elsevier.com/locate/epslMelt-generation...Melt-generation processes associated with theTristan mantleplume: Constraints on the origin of EM-1S.A. Gibson...Road, Durham, DH1 3LE, UKcDepartment of Geologyand Geophysics, Woods Hole Oceanographic Institution...(EM-1) component in ocean–island basalts (OIB, e.g., Kerguelen, Pitcairnand Walvis Ridge)has been attributed...alkaliand tholeiitic basalts from the Walvis Ridgeand Rio Grande Riseand b3 Ma basanitesandbasalts |
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| Geologyand Geophysics, Universio of Oklahoma, Norman, OK 73019, USAb Department of Earthand Planetary...marginal faciesto quartz mangeriteand massif anorthosite intrusive bodiesand as dikes within a variety of...P, K, Ba, Nb, La, Ce, Zn, Ga, Zrand Y characterize these rocksand are distinctive of many matic lithologies...worldwide. Characteristically low concentrations of Niand Cr, in conjuction with lowMg numbers, have been...Ratios of incompatible trace elementsandpatterns on rare earthand ‘spider’ diagrams collectively indicate |
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| EPSLELSEVIEREarthand PlanetaryScience Letters 141 (1996) 277-291Isotope characteristics of the...constraints on the composition of the earlyTristan plumeand the origin of the EM 1 mantle componentSimon...Rondebosch 7700, South Africab Ministry of Minesand Energy, Geological Survey. P.O. Box 2168. Windhoek...August 1995; accepted 22 March 1996AbstractSr, Ndand Pb isotope data are presented for a variety of intrusive...age Okenyenya igneouscomplex, which is temporallyand spatially associated with the Etendeka Group volcanic |
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| THE OCEAN BASINSAND MARGINSVolume |The South Atlantic THE OCEAN BASINSAND MARGINSVolume1:...The North AtlanticVolume 3: The Gulf of Mexicoand the CaribbeanVolume 4: The MediterraneanVolume...Ocean ‘THE OCEAN BASINSAND MARGINS,A.Edited by-AlanjE. M. Nairnand Francis G. StehliDepartment...de Geociéncias e Astronomiaand Centro de PesquisasGeocronolégicasda Universidadede Sao Paulo, Brazil...Instituto de Geociéncias e Astronomiaand Centro de PesquisasGeocronolégicasda Universidadede Sao Paulo, Brazil |
 | le Roex, Anton P, Dick, Henry J.B, Gulen, Levent, Reid, Arch M, Erlank, Anthony J (1987) Local and regional heterogeneity in MORB from the Mid-Atlantic Ridge between 54.5°S and 51°S: Evidence for geochemical enrichment.Geochimica et Cosmochimica Acta, 51 (3) 541-555doi:10.1016/0016-7037(87)90068-8 | Journal (article/letter/editorial) |
| inLocaland regional heterogeneity in MORB from the Mid-Atlantic Ridge between54.5’Sand 51’S: Evidence...ROEX’, HENRY J. B. DICK’, LEVENTGULEN~,ARCH M. REID’and ANTHONY J. ERLANK~‘Department of Geology, University...Ronde~h7700, South Africa2Department of Geologyand Geophysics, Woods Hole Oceanographic Institution...Woods Hole, MA 02543, U.S.A.3Department of Barthand Planetary Sciences, Massachusetts Institute of Technology...between the Bouvet triple junction at 54.5%1“Wand 5 1“S, show a range in texture from aphyric to highly |
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| Contr. iKineral,and Petrol. 29, 242--254 (1970)9 by Springer-Verlag 1970Gough Island: Evaluation of...ZIELINSKI a n d FRED A. FREuDepartment of Earthand Planetary Sciences, MassachusettsInstitute of Technology...Massachusetts 02139Received August 19, 1970Abstract.Gough Island is composed of an alkaline olivine basalt-trachyte...evaluated by correlatingthe geochemical trends of majorand trace elements. Beginning with an alkali olivine...calculation. The modal proportions of cumulative mineralsand trace element distribution coefficients were used |
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| related articlesFull Terms & Conditions of accessand use can be found athttp://www.tandfonline.com/a...at the end of the 1950'sand in the 1960's. In these years new land areasand ephemeral islands were produced...centraland fissure types. Other submarine eruptions did not reach the surface ofthe oceanand were hidden...transverse east-west or almost eastwest structures;and 2) at the nodal structuralpoints on the mid-Atlantic...simultaneously (on the geologictime scale), in the northernand southern hemispheres.The first manifestation of |
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| sources ofterrestrial volcanismD. FrancisEarthand Planetary Sciences, McGill University, 3450 University...2A 7, CanadaReceived 16 October, 1993; revisedand accepted 24 February, 1994AbstractThe success...magmas, on both the continentsand in theoceans, are richer in Feand Ti than the lherzolite mantle source...associatedwith plate boundaries. Moreover, the majorand trace element compositions of hot spot picrites,...convinced geochemists (Hofmannet al., 1984; Freyand Roden, 1987) that residual garnet remains in their |
 | Peate, D. W., Hawkesworth, C. J., Mantovani, M. M. S., Rogers, N. W., Turner, S. P. (1999) Petrogenesis and Stratigraphy of the High-Ti/Y Urubici Magma Type in the Parana Flood Basalt Province and Implications for the Nature of 'Dupal'-Type Mantle in the South Atlantic Region.Journal of Petrology, 40 (3) 451-473doi:10.1093/petroj/40.3.451 | Journal (article/letter/editorial) |
| Petrogenesisand Stratigraphy of the HighTi/Y Urubici Magma Type in the ParanáFlood Basalt Provinceand Implications...HAWKESWORTH2,MARTA M. S. MANTOVANI3, NICK W. ROGERS2ANDSIMON P. TURNER21DANISH LITHOSPHERE CENTRE, ØSTER...consideredas a single entity: Urubici flood basaltsand Walvis Ridge Site525A basalts have a relatively...within originallylithospheric mantle, whereas theTristan plume is a deep mantleupwelling.The high-Ti/Y...spatial extent,near the southeast Brazilian coastand in the northern Etendeka(Namibia). Urubici flows |
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| The Petrology of RodriguezIsland, Indian OceanAbstract: RodriguezIsland is offset from the center...phonoliticsegregation veinsand occasional pyroclastic deposits. Gabbroic xenolithsand xenocrysts, whichare...are widely distributedand locally abundant, areinterpreted as fragments of a layered intrusion(cryptic...chamber at an earlier period of the volcano'shistory,and brought to the surface during a rejuvenation phase...activity. This phase,which has produced the presentisland, seems to haveoccurred after marine planation |