 | | Journal (article/letter/editorial) | | MineralogyandPetrology9 Springer-Verlag 1990Geochemistry of highly-undersaturated oceanisland basalt...Ocean:Fernando de Noronhaand Trindade islandsBarry L. WeaverSchool of Geologyand Geophysics, University...de Noronhaand Trindade comprisea diverse magmatic series ranging from nephelinitesandbasanites to...to phonolitesand, on Fernando de Noronha,trachytes. All rock types are highly silica undersaturated...Noronha trachytes),and have high abundances of incompatible trace elementsand strongly LREE (light |  | | Book | | 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 |  | | Journal (article/letter/editorial) | | 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 |  | | Report (article/chapter) | | 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 |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | Available online at www.sciencedirect.comEarthand Planetary Science Letters 265 (2008) 475 – 486www...www.elsevier.com/locate/epslCe anomalies inGough Island lavas — Trace element characteristicsof a recycled...spectrometryand Sr–Nd isotope analyses arepresented for mafic volcanic rocks fromGough Island, South Atlantic...reveal negative Ce anomalies, with Ce/Ce⁎values inGough lavas extending down to ∼ 0.92. Ce is only fractionated...inherited from seawater can be excluded becauseGough lavas with increasingly negative Ceanomalies do |  | | Journal (article/letter/editorial) | | 2089^21202010doi:10.1093/petrology/egq050Shonaand Discovery Aseismic Ridge Systems,South Atlantic:...ANTON LE ROEX1*, CORNELIA CLASS2, JOHN O’CONNOR3ANDWILFRIED JOKAT41DEPARTMENT OF GEOLOGICAL SCIENCES...Ridge^Meteor Rise^AgulhasRidge^Cape Rise seamounts)and the Discovery Rise to the northhave been argued...to represent the surface expressions of the Shonaand Discovery mantle plumes, based on enriched samples...Mid-Atlantic Ridge, a single sample from Discovery Riseand tectonic reconstructions. Leg PS69 ANT XXIII/5 of |  | | Journal (article/letter/editorial) | | 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 |  | Homrighausen, S., Hoernle, K., Geldmacher, J., Wartho, J.-A., Hauff, F., Portnyagin, M., Werner, R., van den Bogaard, P., Garbe-Schönberg, D. (2018) Unexpected HIMU-type late-stage volcanism on the Walvis Ridge.Earth and Planetary Science Letters, 492. 251-263doi:10.1016/j.epsl.2018.03.049 | Journal (article/letter/editorial) | | Earthand Planetary Science Letters 492 (2018) 251–263Contents lists available at ScienceDirectEarth...Earthand Planetary Science Letterswww.elsevier.com/locate/epslUnexpected HIMU-type late-stage volcanism...GermanycV.I. Vernadsky Institute of Geochemistryand Analytical Chemistry, Kosygin St. 19, 119991 Moscow...Walvis Ridgelate-stage volcanismtrace elementsand isotope geochemistry40Ar/39 Ar datinghigh 238...Volcanic activity at many oceanic volcanoes, ridgesand plateaus often reawakens after hiatuses of upto |  | | Journal (article/letter/editorial) | | 9 by Springer-Verlag 1975Petrological Aspectsand Evolutionof the Leucite Bearing Lavasfrom Bufumbira...Bufumbira, South West UgandaA. K. Fergusonand A. CundariSchool of Geology, University of Melbourne, Parkville...by thepresence of leucite both as phenocrystsand in the groundmass. Samples studied from theBufumbira...differentiates through phonolitictephrites to a trachyteand the other differentiates through leucitites to a...are discussed in terms of the coexistingphasesand ultramafie inclusions observed in the lavas. Equilibrium |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | (397)XIII.—Rocks fromGough Island, South Atlantic (collected by the Scottish NationalAntarcticExpedition...toGough Island on the homeward voyage of the Scotia from the Antarctic seasin 1904. Theisland is not...not often visited,and the only previous account of the rocksis by Professor L. V. PIRSSON,* who described...of basalt, trachytic tuffs,and a trachytic obsidian carrying olivine,and shown bychemical analysis...side of theisland. Theyinclude soda trachytes, trachydolerites, basalts, an essexite,and tuffs.LAVAS |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | manuscript will undergo copyediting, typesetting,and review of the resulting proof beforeit is published...maybe discovered which could affect the content,and all legal disclaimers that apply to thejournal pertain...Alfred Wegener Institute Helmholtz Centre for Polarand Marine Research, Am Handelshafen 12, 27570CR1...Schlossgarten 5, 91054 Erlangen, Germany3Earthand Life Sciences, VU University Amsterdam, De Boelelaan... 28359 Bremen, Germany.5Department of Earthand Environmental Sciences, Ludwig Maximilian University |  | Christensen, Birgitte Printz, Holm, Paul Martin, Jambon, Albert, Wilson, J.Richard (2001) Helium, argon and lead isotopic composition of volcanics from Santo Antão and Fogo, Cape Verde Islands.Chemical Geology, 178 (1) 127-142doi:10.1016/s0009-2541(01)00261-3 | Journal (article/letter/editorial) | | comrlocaterchemgeoHelium, argonand lead isotopic composition of volcanics fromSanto Antao˜and Fogo, Cape Verde Islands...accepted 18 December 2000AbstractHelium, argonand lead isotopic ratios have been determined for volcanics...of the youngest Cape Verde Islands,Santo Antao˜and Fogo. Helium isotopic ratios range from radiogenic...Pb s 18.90–19.63, 207 Pbr204 Pb s 15.526–15.621and 208 Pbr204 Pb s38.694–39.272, with volcanics from...isotopes, high CerPb, ZrrHf, low BarLa, LILErNband low 40Arr36Ar indicate a significantcontribution |  | | Journal (issue) | | 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 |  | | Journal (article/letter/editorial) | | Mineralogyand Magmatic Evolutionof the Basalticand Trachytic Lavas fromGough Island, South Atlantic...AtlanticDepartments of Geologyand Geochemistry, University of Cape Town, Rondebosch 7700,South Africa...1984; in revised form 5 July 1984)ABSTRACTTheGough Island lavas range from picrite 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 |  | 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 |  | | Journal (article/letter/editorial) | | Earthand Planetary Science Letters, 118 (1993) 101-119Elsevier Science Publishers B.V., Amsterdam...geochemicaland isotopic study of the Southeast Province lavasD. Weisa,1 F.A. Frey b, H. Leyrit cand I. Gautier...Brussels, Belgiumb Department of Earth, Atmosphericand Planetary Sciences, Massachusetts Institute of Technology...a 20-22 Ma oldlower Miocene series with basaltsand trachytes belonging to a mildly alkaline series comparable...al. [1]and (b) a 6.6-10.2 Ma old [2] upper Miocene series with basanites, tephri-phonolitesand phonolites |  | 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 |  | | Book (volume) | | 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 |  | | Journal (article/letter/editorial) | | EARTHAND PLANETARY SCIENCE LETTERS 12 (1971) 97-107. NORTH-HOLLAND PUBLISHING COMPANYONE-ATMOSPHERE...ONE-ATMOSPHERE MELTINGAND CRYSTALLIZATION RELATIONS OFLAVAS FROM ANJOUAN, COMORES ARCHIPELAGO, WESTERN INDIAN OCEAN...OCEANR.N.THOMPSON*and M.F.J.FLOWER**Department o f Geology, The University, Manchester M13 9PL, England...1971Revised version received 20 May 1971Basalticand differentiated lavas from Anjouan, Comores Archipelago...hypersthene-normative, alkalicand basanitic, the latter two showing chemical trends to trachyteand phonolite respectively |  | Comin-Chiaramonit, P., Cundari, A., Piccirillo, E.M., Gomes, C.B., Castorina, F., Censi, P., De Min, A., Marzoli, A., Speziale, S., Velazquez, V.F. (1997) Potassic and Sodic Igneous Rocks from Eastern Paraguay: their Origin from the Lithospheric Mantle and Genetic Relationships with the Associated Parana flood tholeiites.Journal of Petrology, 38 (4) 495-528doi:10.1093/petroj/38.4.495 | Journal (article/letter/editorial) | | Potassicand Sodic Igneous Rocks fromEastern Paraguay: their Origin from theLithospheric Mantleand Genetic...P. CENSI6, A. DE MIN3, A. MARZOLI3,S. SPEZIALE6AND V. F. VELÁZQUEZ41DIPARTIMENTO DI INGEGNERIA CHIMICA...Triassicsodic intrusionsand lavas; (2) Early Cretaceous potassic igneousrocksand very scarce sodic lavas;...eastern Paraguay: (1) widespread potassic magmatismand SGF tholeiites (Early Cretaceous);(2) Asunción...proposed, i.e. basanite tophonoliteand alkali basalt to trachyteand their intrusive analogues.The sodic |
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