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| de Luxembourg With 106 Figures and 95 Tables =e in the text and on 8 Folders 1970 GEBRUDER BORNTRAEGER...character- ized, with scarce an exception, by vulcanism, and the yulcanological evolution, rock suites, geomorphological...intimate acquaintance with all the Atlantic islands, and there is every reason to believe this applies even...southern islands separate, for reasons given above, and no less to furnish a volume of reasonable magnitude...general, shown little interest, and indeed the American J.C. Branner and the Belgian, A. RENARD, are the |
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| Abstract The dominant petrochemical evolution of St. Helena volcanics is from undersaturated alkali olivine...nepheline normative trachybasalt and trachyandesite to trachyte and phonolite. A unique lava is described...extreme iron enrichment and internal fractionation towards a granitic mesostasis, and hence is quite unlike...Atlantic island. The unique chemistry is also reflected in the remarkable mineral assemblage andesine-tit...remain enigmatic. Introduction St. Helena is a volcanic island situated in the South Atlantic (5'40'W; |
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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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| 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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| 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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| Geology and Geophysics, Universio of Oklahoma, Norman, OK 73019, USA b Department of Earth and Planetary...marginal facies to quartz mangerite and massif anorthosite intrusive bodies and as dikes within a variety of...P, K, Ba, Nb, La, Ce, Zn, Ga, Zr and Y characterize these rocks and are distinctive of many matic lithologies...worldwide. Characteristically low concentrations of Ni and Cr, in conjuction with low Mg numbers, have been...Ratios of incompatible trace elements and patterns on rare earth and ‘spider’ diagrams collectively indicate |
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| ( 397 ) XIII.—Rocks from Gough Island, South Atlantic (collected by the Scottish National AntarcticExpedition...to Gough Island on the homeward voyage of the Scotia from the Antarctic seas in 1904. The island is not...not often visited, and the only previous account of the rocks is by Professor L. V. PIRSSON,* who described...of basalt, trachytic tuffs, and a trachytic obsidian carrying olivine, and shown by chemical analysis...side of the island. They include soda trachytes, trachydolerites, basalts, an essexite, and tuffs. LAVAS |
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| three genetic series—tholeiitic, low-K alkalic, and high-K alkalic—are recognizable on the basis of relations...differentiation index (DI) a n d total alkalies and b e t w e e n DI a n d the alkali index [AI, here...locality names (hawaiite, tristanite, icelandite, and so f o r t h ) , is inconsistent. Names based o n...plagioclase is oligoclase or andesine, normative quartz is less t h a n 15 percent, and the color index is less...( f o r example, "oceanic"), and distinctive mineralogy, a consistent and informative nomenclature is |
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| Contr. Mineral. and Petrol. 39, 309--326 (1973) 9 by Springer-Verlag 1973 A Basalt-Trachyte-Phonolite...Marquesas Islands, Pacific Ocean Arthur Clive Bishop and Alan Robert Woolley with analyses by Victor Kingsley...Abstract. The paper describes a suite of volcanic and intrusive rocks from Ua Pu, one of the Marquesas...mugearites, trachytes, and phonolites. Their petrographic characters are briefly described and 24 new chemical...analyses presented. The rocks fall into a sodic and a potassic series, since some rocks are richer in |
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| Contr. Mineral. and Petrol. 43, 125--147 (1974) 9 by Springer-Verlag 1974 Petrology of the Ninety East...East Ridge in the Indian Ocean consist of basalts and oceanic 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-Faeroe and the Walvis ridges, show a trend of differentiation...The Ninety East and the Ieeland-Faeroe ridges contain mildly tholeiitic basalts and oceanic andesit~s |
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| Contr. Mineral. and Petrol. 26, 124~160 (1970) The Petrology of the Las Canadas Volcanoes, Tenerife...islands that make up the Canary Archipelago. The island is composed of volcanics belonging to the basa...development of intermediate and salic volcanics has been in the centre of the island where the Las Canadas...shield composed mainly of basanite and ankaramite flows, tufts and agglomerates. The initial post-shield...activity built the Vilaflor volcanic complex (Lower and Upper Canadas Series) that originally covered much |
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| issued in five series corresponding of the Museum, and an to the Departments Historical series. Parts...will contain about three or four hundred pages, and will not necessarily be completed within one calendar...Antarctic Territory Bertha Island, Sheehan Nunatak i Scullin Monolith Chemistry and discussion The Scotia...Clarence Island South Orkney Islands Inaccessible Islands (a) Coronation Island (b) Signy Island (c) Powell...Powell and Michelsen Islands (d) Fredriksen Island (e) (/) Laurie Island Graptolite Island. (g) . Basaltic |
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| Petrol. 58, 29-35 (1976) Contributions to Mineralogy and Petrology 9 by Springer-Verlag 1976 Origin of Anorthoclase...Anorthoclase Megacrysts in Alkali Basalts Nell A. Chapman and Roger Powell Department of Earth Sciences, University...clinopyroxene + kaersutite _+oligoclase) in alkali basalts and their differentiates. The absence of anorthoclase...cumulates, assuming a congeneric origin for megacrysts and nodules. On this basis, density calculations indicate...trachybasalt. Thus, the anorthoclase megacrysts and the associated cumulate nodules did not crystallise |
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| cinder cones and lavas of trachybasalt. Typically the lavas contain magnesian olivine and titanaugite...progressively enriched in ca, Al and ri towards the crystal margins. oscilIatory and hourglass zoning with abrupt...abrupt changes in Ti, AI and si (inversely) have been observed in some titanaugites. Plagioclase may zone...zone from labradorite to anorthoclase, and discrete sanidine is present in the coarsest grained lavas;...Titanomagnetite (microphenocryst and groundmass phases) is notably rich in Mgo and Al:or in contrast to equivalent |
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| 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 |
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| 357-369, 1972 TITANIFEROUS IN BIOTITES DIKE ROCKS AND ASSOCIATED FROM DOZEN, TOKIKO Department OKI...Geology, National Science Museum, Tokyo Tristanites and trachytes occurring as dikes of Oki Dozen carry phenocrysts...clinopyroxene and iron oxide. Biotite and iron oxide are characterized by high TiO2 contents (up to 8 and 30 wt%...Fe+3/(Fe+3+Fe+2) ratios and lower TiO2 contents than the apparently fresh ones. Clinopyroxene and iron oxide show...Fe+3/(Fe+3+Fe+2) ratios and TiO1 contents, but biotite a negative correlation. Association of biotite and clinopyroxene |
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| Mineral. and Petrol. 38, 237--260 (1973) 9 by Springer-Verlag 1973 Evolution of Basaltic and Differentiated...recognised on Anjouan: 'hypersthenenormative', ' alkalic' and 'basanitic', which appear in that order with an eruptive...construction, 2) peripheral fissure-controlled activity, and 3) rejuvenescent (posterosional) eruptions. Differentiated...three chemical groupings, and trend mainly towards undersaturated trachyte and phonolite. Those trends...initial removal of olivine and elinopyroxene, followed by Fe-Ti oxides, apatite and amphibole from arrested |
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| Contr. Mineral. and Petrol. 31, 102-114 (1971) 9 by Springer-Verlag 1971 Some Xenoliths from the Alkalic...Teneriffe: dunites and clino-pyroxenites in the old alkalic basalt formations of Teno and Anaga peninsulas;...xenoliths in the Las Canadas and Vilaflor regions where intermediate and phonolitic lavas are abundant;...abundant; ultramafic, clino-pyroxenite and syenitic xenoliths in the Anaga peninsula where there are many intrusions...intrusions of nepheline-syenite and phonolitic syenite. Several xenoliths show signs of cataclasis, recrystallisation |
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| PETROLOGY OF LORD HOWE ISLAND, PART i THE YOUNGER : VOLCANICS p. M. GAME BULLETIN OF THE BRITISH...LONDON : 1970 PART I PETROLOGY OF LORD HOWE ISLAND THE YOUNGER VOLCANICS : BY MALCOLM GAME PHILIP...corresponding to the Departments of the Museum, and an Historical series. Parts will appear at irregular...about three or become ready. four hundred pages, and will not necessarily be completed within one calendar... Price £2 5s. (£2.25) PETROLOGY OF LORD HOWE ISLAND PART I THE YOUNGER VOLCANICS : Bv P. M. GAME |
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| 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 |
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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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| 1998 Isotope and Trace Element Geochemistry of Cretaceous Damaraland Lamprophyres and Carbonatites,...Plume–Lithosphere Interactions ANTON P. LE ROEX∗ AND RUTH LANYON†DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY...ACCEPTED DECEMBER 12, 1997 Major and trace element and radiogenic and stable isotope data are reported...reported for Cretaceous lamprophyres and carbonatites associated with alkaline igneous complexes in Damaraland...emplaced as late-stage dykes, stocks and diatremes, include both alkaline and ultramafic varieties. Many of |
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| PART OF JAPAN MAKOTO SAWAI Anjo High School, Aichi and MITSUO SHIMAZU Niigata University, Niigata In...distributed, numerous alkali basalt dikes and sheets occur and some of them were studied by Kuno (1960)...(1960). A trachyte dike also occur in the area and it is most alkaline among the rocks of the area. The trachyte...rohedenbergite, fayalite, arfvedsonite, plagioclase and alkali feldspar. Groundmass minerals are alkali feldspar...feldspar sodic ferrohedenbergite, aenimgatite and titanomagnetite. The trachyte includes small xenoliths |
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| Contr. Mineral. and Petrol. 19, 1--71 (1968) The Oxygen Isotope Geochemistry of Igneous Rocks* HUOH...analyses have been obtained for 443 igneous rock and mineral samples from various localities throughout...Clear Lake, S. E. Guatemala, Hawaii and Easter I. volcanic complexes and on the Bushveld, Muskox, Kiglapait...Jean, Laramie, Skaergaard, Mull, Skye, Ardnamurchan and Alta, Utah plutonic complexes, as well as upon several...intrusions of S. E. Alaska. Basalts, gabbros, syenites and andesites are very uniform in 01s/o 16, commonly |
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| Contributions to Mineralogy and Petrology Contrib. Mineral. Petrol. 73, 179 189 (1980) 9 by Springer-Verlag...Deccan Traps, Rajpipla, India P. Krishnamurthy *i and K.G. COX 2 i Grant Institute of Geology, King's Buildings...Edinburgh, United Kingdom z Department of Geology and Mineralogy, Parks Road, Oxford, United Kingdom Abstract...In the same area however early tholeiitic flows and late tholeiitic dykes show the potassium-poor nature...rocks of the alkalic suite are highly porphyritic and their major element variation can be interpreted |
