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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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| EARTH AND PLANE'IARY SCIENCE LETTERS 5 (]t969) 353-359. NORTII-HOLLAND PUBLISIIING COMP., AMSTERDA.'...M P O S I T I O N ST.HELENA OF LEAD FROM AND ASCENSION ISLANDS Patti W.GAST Lamont Geological Obst...7 volcanic rocks from St, Helena and 7 volcanic rocks from Ascension Island ale: pres,e-;tc,d. The St...presentatiorl relati.!lgthe pa.rameters ,a 1, g2 and T 1 for a two-stage lead ,:volution model i~sgiven...Th/U ratio of the upper mantle source of the St. Helena vcqeanic rocks were fi'aetionated prior to se, |
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| 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...trachyandesite and trachyte to comendite. Basalt sensu stricto is relatively rare and there is a scarcity |
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| http://www.tandfonline.com/loi/tigr20 Structure and composition of terrestrial crust in relation to problems...cite this article: G.D. Afanas'yev (1971) Structure and composition of terrestrial crust in relation to problems...related articles Full Terms & Conditions of access and use can be found at http://www.tandfonline.com/a...University] Date: 19 June 2016, At: 12:54 Structure and composition of terrestrial crust in relation to problems...12:54 19 June 2016 INTRODUCTION The composition and structure of the earth's crust are a problem with |
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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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| ZIRCONIUM-HAFNIUM FRACTIONATION IN OCEANIC BASALTS FROM ASCENSION ISLAND* A.N. GARG Department of Chemistry, Nagur...440 010 (India) (Received May 12, 1981; revised and accepted August 28, 1981) ABSTRACT Garg, A.N., 1981...oceanic basalts from Ascension Island. Chem. Geol., 34: 235--241. Zirconium and hafnium have almost identical...identical physical and chemical properties and are always found together in terrestrial rocks and minerals. A...Jersey--New Hamshire, have been analysed for their Zr and Hf abundances. No systematic variation in Zr/Hf weight |
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| a g m a and fluid evolution in the lavas and associated granite xenoliths of Ascension Island Chris Harris...Harris and Simon M.F. Sheppard S U M M A R Y : The mildly alkaline lavas of Ascension Island evolved in...similar to the evolved lavas contain silicate glass and fluid inclusions which demonstrate that the original...original granite magma is due to sea-water addition and that this explains these differences. Sea-water interaction...interaction with high-level magma chambers on Ascension may have been the cause of the extensive pyroclastic |
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| 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 |
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| Magmatic Inclusions in the Plutonic Ejecta of Ascension Island by CHRIS HARRIS* (Received 25 May 1984; revised...Plutonic blocks' in the volcanic and pyroclastic rocks of Ascension Island contain a variety of silicate... mainly in the intermediate (monzonite-syenite) and granite types. The silicate melt inclusions consist...density CO2 + H 2 0 inclusions, predominantly vapour and (iii) high density approximately pure H2O inclusions...5 wt. per cent H2O before saturation was reached and homogenization temperatures show the trapping of |
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| 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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| 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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| Crystallization and destabilization of eudialyte-group minerals in peralkaline granite and pegmatite: a...complex, Madagascar GUILLAUME ESTRADE *, STEFANO SALVI AND DIDIER BÉZIAT University of Toulouse, GET, CNRS,...common in highly evolved SiO2-undersaturated syenites and are characteristic minerals of agpaitic rocks. Conversely...granites from the Cenozoic Ambohimirahavavy complex, and assess the magmatic conditions required to crystallize...minerals) EGM occur as late phases and are the only agpaitic and major rare-earth element (REE) bearing |
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| 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) |
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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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| 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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| silicic melts FABRICE GAILLARD,* BRUNO SCAILLET, AND MICHEL PICHAVANT ISTO, CNRS, 1 A rue de la Férollerie...in two hydrous rhyolitic melts, one metaluminous and the other peralkaline, have been studied at 800 rC...water contents from ~5 wt% to saturation and fO2 between NNO-2 and NNO + 3 (NNO = nickel-nickel oxide redox...10 hours and the peralkaline one (~3 wt% FeOT) after 3 hours. The kinetics of Fe oxidation and reduction...reduction are similar and unaffected by the presence or absence of a hydrous fluid phase. No redox front is |
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| Contributions to Mineralogy and I~etrology Contrib Mineral Petrol (1982) 79 : 107-113 ,~ Springer-Verlag...Syenite Blocks from Ascension Island C. Harris and J.D. Bell Department of Geology and Mineralogy, Parks...included in a trachyandesite lava flow on Ascension Island exhibit features attributable to partial melting...The liquid so formed has been quenched to a glass and the chemical variation of the glass is considered...mineralogy and modal proportions of each block - especially the presence or absence of quartz - and the chemical |
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| 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 |
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| sunlight it had quite a noticeable reddish color and was easy to see against the white sand. While not...beautiful sketch of the beach in red, brown, green and blue accompanied the letter.) The sample is a fine...black lustrous ilmenite, black lustrous magnetite, and colorless zircon that fl. orange. It is the garnet...was panned for 510 gold but the creek is dry now and the water is taken out for irrigation several miles...driving through Glenwood (Sussex Co.), N.J., and I thought of you and your interest in sands. Enclosed is a |
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| reported from Kerguelen Island gives a phonolite with 58.2 per cent. of silica and 12.0 of alkalies; the...only one from Gough's Island a trachyte obsidian with 61.2 per cent. silica and I2.4 of alkalies; the...the only two from Ascension Island are trachyte and obsidian, the former'with 71.o per cent. of silica,...the preface, this book is "intended for beginners and aims to present the essential features of geometrical...of forty-one titles of important reference books and articles is at the beginning of the book. This is |
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| geoohemistryof Se: A oomparisonto the rare edhs and Fe JACK C. NORIUN* and LARRY A, HAB~IN Chemistry Department...neutron a&iv&ion analyses for SC and Fe in 76 samples of igneous and sedimentary rook, including 9 composites...(average, 3O-40 ppm) werefound in basalts and gabbros and the lowest in nephelinesyenitesand limestones...geoohemicalrelationshipwhich might be expected between SC and the heaviest rare earths on the basis of ionic size...for a close geochemical relationshipbetween Sc3+ and Fez+, Mg2f, or any other major element or ion in |
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| Contr. Mineral. and Petrol. 28, 340---351 (1970) 9 by Springer-Verlag 1970 Petrochemical Variations...(Comendite) Obsidians from the Oceans and Continents D. K. B ~ L v . r and R. M~CDO~ALD * Department of Geology...Abstract. Eleven new analyses and modes of comendite obsidians are presented, and compared with all available...commonly alkali feldspar. The oxides Si02, M~O3, Na~O and K~O total over ninety percent by weight in all analyses...projected into the system Na~OK20-AI~Oa-SiO2, oceanic and continental samples group differently. Oceanic specimens |
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| THE MINERALOGICAL MAGAZINE AND 5OURNA_L OF T H E ~V[INER&LOGICAL SOCIETY. No. 96. March, 1922. Vol...Vol. X I X . Density, refractivity, and com2~osition ~'elations of some natural glasses. By C. E. TH,L~V...density, refractivity, ttud chemical composition, and the interrelations of these for particular glasses...there is no record of the density of these rocks, and the interrelation of these remained unknown. In the...they were determined ranged from 18 to 15 ~ C., and their accuracy is within the limits _+0.002. The |
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| Glasses are thermodynamically unstable; with time and under a variety of conditions, they become crystalline...silicate melts. The writer uses simple rate theory and the available experimental data to set an approximate...constant at 20° C is estimated to be 10~ cm2/sec, and pressure-bomb experiments indicate an activation...no more than about 300° C. CONTENTS Introduction and acknowledgments 1494 Figure Distribution of volcanic...diagram showing variation of degree Crystal growth and temperature 1498 of order (or viscosity) with free |
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| Florida to visit my relatives. Being an amateur, and having the adventurous spirit of a 12year-old, I...cut away to make way for a highway. Veins of white and pink calcite (intermixed) were also found in the...Riverside Co., Calif. The nasonite is part yellow and the other a pale bluish-green. The discovery was...reads: "In the November-December 1952 issue of ROCKS AND MINERALS under "World News on Mineral Occurrences...Californian, I can not mediate between mica schist and slate. It resembles very much in appearance the help |
