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| EARTH AND PLANETARY SCIENCE LETTERS 4 (1968) 103-106. NORTH-HOLLAND PUBLISHING COMP., AMSTERDAM INTERMEDIATE...INTERMEDIATE OCEANIC VOLCANIC ROCKS AND THE 'DALY GAP' Ian BAKER * Department of Geology, Imperial College...rocks of the alkali basalt - trachyte - phonolite assemblage on Saint Helena demonstrate a decrease from... resulted in bimodal distributions of collected and analyzed rock types. Volumetric data of this type...than end members o f the series (i.e. basalt and trachyte, phonolite or rhyolite). Largely as a result |
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| England Petrology of the Volcanic Rocks of Saint Helena Island, South Atlantic Abstract: Detailed field...of the two deeply eroded shield volcanoes of Saint Helena has permitted a reconstruction of their growth...textural and chemical variations from basic to salic ends of the series. Major oxide contents and a number...of known stratigraphic position. The intermediate and trachytic rocks are believed to be derived from a...processes of crystal fractionation. Volatile transfer and migration of alkali-rich late-crystallizing fluids |
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| Mineralogy and Petrology 9 Springer-Verlag 1990 Geochemistry of highly-undersaturated ocean island basalt...Ocean: Fernando de Noronha and Trindade islands Barry L. Weaver School of Geology and Geophysics, University...de Noronha and Trindade comprise a diverse magmatic series ranging from nephelinites and basanites to...to phonolites and, on Fernando de Noronha, trachytes. All rock types are highly silica undersaturated...Noronha trachytes), and have high abundances of incompatible trace elements and strongly LREE (light |
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| 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 |
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| The Geology of Saint Helena Island Author(s): Reginald A. Daly Source: Proceedings of the American Academy...Academy of Arts and Sciences, Vol. 62, No. 2 (Mar., 1927), pp. 31-92 Published by: American Academy of...that helps scholars, researchers, and students discover, use, and build upon a wide range of content... We use information technology and tools to increase productivity and facilitate new forms of scholarship...digitize, preserve and extend access to Proceedings of the American Academy of Arts and Sciences. http://www |
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| Contributions to Mineralogy and Petrology Contrib Mineral Petrol (1986) 93 :297-311 9 Springer-Verlag...Springer-Verlag 1986 Petrology and evolution of transitional alkalinesub alkaline lavas from Patmos, Dodecanesos...magma mixing and assimilation G. Paul Wyers and Michael Barton Department of Geology and Mineralogy, The...43210, USA Abstract. Petrographic, mineral chemical and whole-rock major oxide data are presented for the...about 7 m.y. ago and range in composition from ne-trachybasalts through hy-trachybasalts and trachyandesites |
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| 9 by Springer-Verlag 1975 Petrological Aspects and Evolution of the Leucite Bearing Lavas from Bufumbira...Bufumbira, South West Uganda A. K. Ferguson and A. Cundari School of Geology, University of Melbourne, Parkville...by the presence of leucite both as phenocrysts and in the groundmass. Samples studied from the Bufumbira...differentiates through phonolitictephrites to a trachyte and the other differentiates through leucitites...are discussed in terms of the coexisting phases and ultramafie inclusions observed in the lavas. Equilibrium |
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| THE PETROS PETROCHEMICAL DATA BANK DAVID L. BARR and FELIX E. MUTSCHLER Department of Geology,Eastern...Eastern WashingtonUniversity, Cheney, WA 99004,U.S.A. and OWEN P. LAVIN Department of Geological Sciences, Queens...of interactive FORTRAN IV programs for accessing and operating on majorelement whole-rock chemical analyses...on user-supplied criteria, normativecalculations and rock classification,graphical displays including...including histograms, X-Y plots, triangular plots, and various statistical analyses based on the SPSS System. |
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| m / l o c a t e / l i t h o s The geochemistry and evolution of Palaeogene phonolites, central Namibia...collectively exhibit a narrow compositional range and represent a single magma system of highly evolved...Na2O, Rb, Th, Zr, Zn, Pb, and REE and very low abundances of MgO, P2O5, Sr and Ba. No mafic rocks are associated...associated with the Aris phonolites and their ultimate petrogenetic origin remains obscure. The more abundant...sanidine (and nepheline) and pyroxene. The behaviour of REE is decoupled from Zr, Nb, and Th in this |
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| DISCRIMINATION O F D I F F E R E N T MAGMA SERIES AND T H E I R D I F F E R E N T I A T I O N PR O D U...U CT S USING IMMOBILE ELEMENTS J.A. WINCHESTER and P.A. FLOYD Department of Geology, Univermity of Keels...August 18, 1976; revised and accepted October 18, 1976) ABSTRACT Winchester, J.A. and Floyd, P.A., 1977. Geochemical...Geochemical discrimination of different malpa8 series and their differentiation products using immobile elements...abundance and distribution of selected minor and trace elements (Ti. Zr, Y, Nb, Ce, Ga and So) in fresh |
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| Contributions to Mineralogy and Petrology Contrib. Mineral. Petrol. 67, 11 - 15 (1978) 9 by Springer-Verlag...Crystallization of Pyroxenes and Amphiboles in Some Alkaline Rocks and the Presence of a Pyroxene Compositional... Australia Abstract. Ca- and Na-rich pyroxene-amphibole compositions and textures from a range of felsic...amphibole crystallizes, a gap is observed between Ca- and Na-rich pyroxene compositions. This break in composition..."immiscibility gap" between Caand Na-rich pyroxenes and can be overlooked when considering pyroxene compositions |
 | Grant, Norman K., Powell, James L., Burkholder, Flora R., Walther, John V., Coleman, Max L. (1976) The isotopic composition of strontium and oxygen in lavas from St. Helena, South Atlantic. Earth and Planetary Science Letters, 31 (2) 209-223 doi:10.1016/0012-821x(76)90213-2 | Journal (article/letter/editorial) |
| Earth and Planetary Science Letters, 31 (1976) 209-223 © Elsevier Scientific Publishing Company, Amsterdam...ISOTOPIC COMPOSITION OF STRONTIUM AND OXYGEN IN LAVAS FROM ST. HELENA, SOUTH ATLANTIC NORMAN K. GRANT,...of Geology and Geophysics, University o f California at Berkeley, Berkeley, Calif. (USA) and MAX L. COLEMAN...Strontium and oxygen isotope measurements on the alkali basalt-trachyte-phonolite suite of St. Helena show...the late-fractionated rocks are enriched in 87Sr and depleted in 180 relative to the older basalts. The |
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| Contributions to Mineralogy and Petrology Contrib Mineral Petrol (1987) 97:279 291 9 Springer-Verlag1987...Geochemistry of a transitional ne-trachybasalt - Q-trachyte lava series from Patmos (Dodecanesos), Greece:...fractionation, mixing and assimilation G. Paul Wyers and Michael Barton Department of Geology and Mineralogy, The...OH 43210, USA Abstract. Trace-element and preliminary Sr- and O-isotopic data are reported for a transitional...ne-trachybasalt, hy-trachybasalt, hy-trachyandesite and Q-trachyte. Rb, Sr and Ba contents, as well as K/Rb ratios, |
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| Reviews—Geology of Saint Helena. 331 By R. A. DALY. Proc. Amer. Acad. Arts and Sci., vol. lxii, pp...results of Professor Daly's visit -'-*- to St. Helena in the course of the Shaler Memorial Expedition...MAGAZINE in 1922. The present paper is an amplification and full discussion of the data then obtained. In the...angles and often almost or quite in contact. This seems to be a new conception in vulcanology, and is taken...islands, but in addition there are plugs and masses of trachyte and phonolite, the usual alkaline differentiates* |
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| Reviews—Geology of Saint Helena. 331 By R. A. DALY. Proc. Amer. Acad. Arts and Sci., vol. lxii, pp...results of Professor Daly's visit -'-*- to St. Helena in the course of the Shaler Memorial Expedition...MAGAZINE in 1922. The present paper is an amplification and full discussion of the data then obtained. In the...angles and often almost or quite in contact. This seems to be a new conception in vulcanology, and is taken...islands, but in addition there are plugs and masses of trachyte and phonolite, the usual alkaline differentiates* |
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| BETWEEN DIFFERENT TYPES OF MID-OCEAN RIDGE BASALTS AND CONTINENTAL THOLEIITES WITH THE N b - Z r - Y DIAGRAM...between different types of mid-ocean ridge basalts and continental tholeiites with the Nb--Zr--Y diagram...diagram using the immobile trace elements Nb, Zr and Y. The diagram distinguishes between different types...ridges and "P-type MORB", from plume-influenced regions), within-plate tholeiites (WPT), and withinplate...arc basalts (VAB) plot within both WPT and N-type MORB fields and thus cannot be distinguished from these |
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| Lineages and Fractionation Trends in Undersaturated Volcanic Rocks from the East Otago Volcanic Province...Province (New Zealand) and Related Rocks by D. s. COOMBS and j . F. G. WILKINSON ABSTRACT The petrology...sodic lavas and shallow intrusives whose compositions range from alkali basalt, basanite, and nephelinite...nephelinite to trachyte and phonolite. A range of relatively potassic volcanic rocks is also developed in the... The degree of undersaturation and ratios such as (FeO+Fe2O3):MgO and K,O:Na,O vary widely in rocks with |
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| 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 |
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| predominates, whereas mafic nepheline syenitic gneiss and rare feldspar-poor nepheline gneiss occur locally...chemically similar to phonolite, alkali trachyte, comendite, mugearite, and ijolite; the leucocratic rocks plot...mafic gneiss and amphibolite similar in chemical composition to basanite, alkali basalt, and hawaiite. Mafic...geochemical link between the mafic gneiss and amphibolite and the leucocratic alkaline gneiss. Petrochemical...Petrochemical trends on variation diagrams and close field relations suggest that the parent igneous rocks of |
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| activity, older, middle, and younger, are represented on Moheli. The island was originally a large central-type...basalt, basanite and melanephelinite, with lesser amounts of nephelinite, trachyte, and phonolite are the...alkali gabbro, theralite, and ijolite. Inclusions of ultramafic rocks are common, and rare sandstone inclusions...nephelinite and trachyte to phonolite, caused by fractionation of olivine, clinopyroxene, and (later) feldspar...mantle material. A striking low potassium content and consequent low K:Rb ratios in the basanite are tentatively |
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| system: mineral chemistry and trace element partitioning between Mg-hastingsite and alkali basaltic melt M...M VICCARO, C FERLITO and R CRISTOFOLINI* Dipartimento di Scienze Geologiche, Università...in the volcanics of the whole Etnean succession and commonly are represented by kaersutites to titanian...been found in lavas and tephra from the 2001 eruption at Mt. Etna. New major (EMPA) and trace element (LAM-ICP/MS)..., AlVI , K and Mg# values, which are higher in Mg-hastingsite than in kaersutite. Ti and Na are lower |
 | Kawabata, Hiroshi, Hanyu, Takeshi, Chang, Qing, Kimura, Jun-Ichi, Nichols, Alexander R. L., Tatsumi, Yoshiyuki (2011) The Petrology and Geochemistry of St. Helena Alkali Basalts: Evaluation of the Oceanic Crust-recycling Model for HIMU OIB. Journal of Petrology, 52 (4) 791-838 doi:10.1093/petrology/egr003 | Journal (article/letter/editorial) |
| 1093/petrology/egr003 The Petrology and Geochemistry of St. Helena Alkali Basalts: Evaluation of the Oceanic...JUN-ICHI KIMURA, ALEXANDER R. L. NICHOLS AND YOSHIYUKI TATSUMI AND TECHNOLOGY (JAMSTEC), YOKOSUKA 237-0061...element, trace element, and petrographic data on alkali basalts from St. Helena, and examine the geochemical...420·5) ocean island basalts. Petrographic and compositional variations in the St. Helena basalts are best...the combined effect of fractional crystallization and accumulation of phenocrysts. Primary melt compositions |
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| 1975. All ";yhts reserved VOLCANIC ROCK SERIES AND :-:10039 TECTONIC SETTING. Annu. Rev. Earth Planet...CLASSIFICATION OF BASALTS AND THREE MAIN VOLCANIC ROCK SERIES Basalts are the most widespread and abundant type of...of volcanic rock on the earth. Daly (1914) and Bowen (1928) regarded magmas of basaltic composition as...from the same basaltic magma. Andesite, dacite, and rhyolite were regarded as representing residual liquids...alkalic. Thus, Daly and Bowen presumed the uniformity of parental basaltic magmas and the derivation of |
 | | Book |
| by continuous study of the w o rld ’s geological and geophysical liter ature. It is the first book of...due w eight to the latest and best results of investigations in both geology and earth physics. T h e book...earth-model, analogous to the model atom of physics and the model star of astronomy, to illus trate the...author takes into account both the earth’s relief and the underground, invisible conditions which have...physical geology, and structural geology, the book is of consid erable interest and usefulness to chemists |
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| partitioning between olivine and silicate melt: implications for melt structure and calcium content of magmatic...that control calcium partitioning between olivine and melt in a magmatic environment was undertaken using...alumina, alkali and ferrous iron present in the coexisting melt. Oxygen fugacity and temperature are...model describing Ca partitioning between olivine and melt is developed. When applied to natural olivines...melt composition during olivine crystallization and/or to assess whether an olivine is in equilibrium |
