 | | Book | | 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 |  | Taran, Y.A., Fischer, T.P., Cienfuegos, E., Morales, P. (2002) Geochemistry of hydrothermal fluids from an intraplate ocean island: Everman volcano, Socorro Island, Mexico. Chemical Geology, 188 (1) 51-63 doi:10.1016/s0009-2541(02)00061-x | Journal (article/letter/editorial) | | fluids from an intraplate ocean island: Everman volcano, Socorro Island, Mexico Y.A. Taran a,*, T.P. Fischer... 04510, Mexico D.F., Mexico Department of Earth and Planetary Sciences, The University of New Mexico...Socorro Island, Mexico, still volcanically active, is an alkaline and peralkaline volcanic island in the...3.5 Ma. Gas and water samples collected on the island in 1999 from the dome fumaroles and hot springs...for major components, H-O-C-S, He and Ar isotopic composition, and noble gas abundances. The boiling-point-temperature |  | | Journal (article/letter/editorial) | | 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 to a...are discussed in terms of the coexisting phases and ultramafie inclusions observed in the lavas. Equilibrium |  | | Journal (article/letter/editorial) | | composition of xenoliths from the oceanic crust and volcanic edifice beneath Gran Canaria (Canary Islands):...sediments and altered Jurassic MORB from Gran Canaria (Canary Islands) represent samples of sub-island oceanic...for crustal contamination of basaltic and felsic ocean island magmas. The meta-igneous rocks show great...is lower than MORB (5.7 – 6.0x ). Layer 2 lavas and dykes show a broader range of d18O of 4.1 – 8.6x...the dominant process in layer 3, while both high- and low-temperature alteration have variably affected |  | | Journal (article/letter/editorial) | | 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 |  | | Report (volume) | | 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 |  | | Journal (article/letter/editorial) | | 256 Movement of screw dislocations in hematite. (With Plates I and II.) By A. F. SEAGER, B.Sc., Ph.D.,...k College, U n i v e r s i t y of L o n d o n , and I. SVNAGAWA, D.Sc. R o y a l H o l l o w a y College...structure of the basal pinacoid of crystals of hematite has been studied by phase contrast microscopy...are initiated from the centre of growth spirals, and cross the growth fronts without interrupting the...higher side on the left for right-handed spirals and vice versa. In the majority of cases the step is |  | | Journal (article/letter/editorial) | | localities, give good information. Roth the layer growth and spiral growth theories have been establised by studying...place by two-dimensionalspreading and piling up of growth layers and not by three-dimensionalprecipitation...4 The writer reported his observationson one hematite crystal on which the final history of growth can...questions. The writer has made observationson hematite crystalsfrom the Iollowing localities:Ayumikotan...Gihofuji, Okayama Pref.; and Saganoshima'Nagasaki Pref., in Japan; Vesuvius and Stromboli in Italy; the |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | AUG., 1960 MECHANISM AND TWIN OF CRYSTAL GROWTH, FORMATION ETCHING OF HEMATITE* ICHIRO SUNAGAWA Geochemical...structures of hematite crystals from nine localities are ob served with an ordinary reflecting and a phase...phase contrast microscope,and the step heights of growth layers as well as the other surface features are...etching, twin formation and movementof screw dislocationsafter the cessation of growth and the possibility of...polytypism are discussed in this paper. Physical and chemicalconditionsunder whichhematite crystals have |  | | Journal (issue) | | 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 |  | | Journal (article/letter/editorial) | | et al.) 14 1 70 Basalt, K/Ar, Alaska, Nunivak Island (Cox, Allan, et al.) 3 2 173 Basalt, K/Ar, Cretaceous...K/Ar, Pliocene, Pacific Ocean, Norfolk Island, Philip Island (McDougall, lan, et al.) 14 3 367 Basalt...dacite, rhyolite, whole rock, K/Ar, data, volcanism, island arcs, Tertiary, West Indies, Lesser Antilles, Limestone...rocks, dacite, minerals, biotite, Ar/Ar, data, island arcs, evolution, plate tectonics, upper Tertiary... basalt, K/Ar, Quaternary, Indian Ocean, Saint Paul Island (Watkins, N. D., et al.) 24 3 377 Igneous |  | | Journal (article/letter/editorial) | | K. SCHMITT,†,* ROBERT B. TRUMBULL, PETER DULSKI, AND ROLF EMMERMANN GeoForschungsZentrum Potsdam, PB 4...granitic and pegmatitic dikes and sills and is characterized by locally extreme enrichments in REE and rare...with high charge-ionic radius ratios, such as Zr and Nb. The highest concentrations (e.g., 1.7 wt % Zr...arfvedsonite granite and pegmatite give unequivocal evidence that the peralkaline composition and rare metal enrichments...are primary magmatic features. Electron microprobe and SIMS analyses of rehomogenized inclusion glasses |  | | Journal (article/letter/editorial) | | Yong-Fei Zheng * School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026...isotope indices of both CIPW normative minerals and normalized chemical composition. The consistent results...negligible oxygen isotope fractionation between rock and melt of the same compositions. The present calculations...– lava systems at the temperatures above 1000 K and rock – water systems in the temperatures range of...are consistent with existing data from experiments and/or empirical calibrations. The obtained results can |  | | Journal (article/letter/editorial) | | leading to unmixing of carbonatites on Brava Island (Cape Verde) and a general model of carbonatite genesis...Heidelberg 2016 Abstract The carbonatites of Brava Island, Cape Verde hot spot, allow to investigate whether...fractions or form through extreme fractionation and/or liquid immiscibility from CO2-bearing silicate...silicate magmas. The intrusive carbonatites on Brava Island are part of a strongly silica-undersaturated pyroxenite...combeite–foiditite, carbonatite series. The major and trace element composition of this suite is reproduced |  | | Journal (article/letter/editorial) | | 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 |  | Irwin, J.J., Roedder, Edwin (1995) Diverse origins of fluid in magmatic inclusions at Bingham (Utah, USA), Butte (Montana, USA), St. Austell (Cornwall, UK), and Ascension Island (mid-Atlantic, UK), indicated by laser microprobe analysis of Cl, K, Br, I, Ba + Te, U, Ar, Kr, and Xe. Geochimica et Cosmochimica Acta, 59 (2) 295-312 doi:10.1016/0016-7037(94)00285-t | Journal (article/letter/editorial) | | (Montana, USA), St. Austell (Cornwall, UK), and Ascension Island (mid-Atlantic, UK), indicated by laser microprobe...of Cl, K, Br, I, Ba + Te, U, Ar, Kr, and Xe J. J. IRWIN’.* and EDWIN ROEDDER’ ‘Department of Physics...California, Berkeley, CA 94720, USA ‘Department of Earth and Planetary Science, Harvard University, (Received...in rocks from Bingham, Utah, Ascension Island, mid-Atlantic Ocean, and St. Austell, Cornwall. Slightly...temperature FI occur at Butte, Montana. Argon, Kr, and Xe were extracted from FI by laser microprobe decrepitation |  | Jeffery, A. J., Gertisser, R., Jackson, R. A., O'Driscoll, B., Kronz, A. (2016) On the compositional variability of dalyite, K2ZrSi6O15: a new occurrence from Terceira, Azores. Mineralogical Magazine, 80 (4) 547-565 doi:10.1180/minmag.2016.080.018 | Journal (article/letter/editorial) | | JACKSON1, B. O’DRISCOLL1,2 AND A. KRONZ3 1 2 3 School of Physical and Geographical Sciences, Keele...Staffordshire ST5 5BG, UK School of Earth, Atmospheric and Environmental Sciences, The University of Manchester...the placement of substituting Hf and Ti in the octahedral site, and highlight the overall complexity...Fe, Mg and Ba. The combined dataset reveals that dalyite found within peralkaline granites and syenites...is generally defined by higher Na↔K substitution and lower Ti↔Zr substitution relative to dalyite from |  | | Journal (article/letter/editorial) | | in Ejected Granitic Blocks from Ascension Island1 by EDWIN ROEDDER and D. s. COOMBS U.S. Geological...D.C., 20242 and Geology Department, University of Otago, New Zealand ABSTRACT Quartz and alkali feldspar...glass, with a small, very low-pressure gas bubble and sometimes a crystal offluorite(?).The original material...crystal (usually with other crystalline phases), and a large gas bubble containing some CO2. The original...temperature it consists of a dilute water solution and a very large, high-pressure CO2 gas bubble. Type |  | | Journal (article/letter/editorial) | | of smoky quartz, white feldspar, black biotite, and some lustrous black magnetite. Birmingham (Jefferson...magnetite and brown clay. Minor amounts present are black biotite, silvery muscovite, and brown sandstone...Feather River, near Paradise, Butte Co., Calif.., and was sent us by Arthur W . Browne, 623 Palo Alto Ave...feldspar with some blackish biotite, silvery muscovite, and light to dark green serpentine. Beach sand' from...Desport, 1229-17th Ave., So., Nashville, Tenn. ROCKS AND MINERALS The sample is a fine grained, gray sand |  | | Journal (article/letter/editorial) | | printed in SMALLCAPITALS,subjects in lower-case roman, and localities in italics; book reviews are placed at...ABDUL-SAMAD, F. A., THOMAS, J. H., WILLIAMS,P. A., and SYMES, R. F., lanarkite, 499 AEGEAN SEA, Santorini...es, X-ray study, 459 Amphibole, microstructures and phase transformations, 395; Greenland, 283 Andradite...banded iron-formation assemblage, 127 ANGUS, N. S., AND KANARIS-SOTIRIOU, R., autometasomatic gneisses, 411...411 Anthophyllite, asbestiform, morphology and alteration, 77 Aragonite, atomic arrangements on twin |  | | Journal (article/letter/editorial) | | pp. 89-99 GENESIS VICTOR OF T. ALLEN HAWAIIAN AND BAUXITE G. DONALD SHERMAN ABSTRACT Clinker zonescomposed...the original glassand mineralsof basaltic lavas and formed bauxite. Rain that fell in vast quantitiesalong...quantitiesalong the central ridges of Kauai, Maui, and Hawaii descended alongcracksto the permeableclinkerzones...andstudied by himandhis colleagues. 89 90 V. T. ALLEN AND G. D. SHERMAN KAUAI Kauai,themostnortheasterly islandof...melilite-nepheline basalt, and other related types. These rocksare low in silica,and containbasalticglass,orthosilicates |  | | Journal (article/letter/editorial) | | Na2O-Al2O3-Fe2O3-SiO2 at 1 Atmosphere, and the Petrogenesis of Alkaline Rocks by D. K. BAILEY 1 and j . F. SCHAIRER Geophysical...elucidation of the origins and possible inter-relationships of magmas, and foremost among theories on...Equilibria involving acmite, albite, nepheline, quartz, and a liquid phase constitute the petrologically important...part of the system Na.O-AltOj-FetC^-SiOt, and the univariant and invariant relations provide useful analogies...acmite-nepheline-silica; instead, a broad field of hematite is present and acmite crystallizes only from liquids containing |  | | Journal (article/letter/editorial) | | Subjects in lower-case roman, and Localities in italics. The minerals, localities, and authors mentioned in the...reports of the I.M.A. Commission on New Minerals and in the 25th List of new m i n e r a l n a m e s (...lithian, synthesis, equilibrium with eucryptite and with fl-spodumene, 578. Alluaudite, Rhodesia, 50...Botswana, anal., opt., X-ray, sp. gr., 775; Norway and Sweden, anal. (TiO 2 only), opt., X-ray, 775. Animas...Sb4ObC1~ and SbsOnC] 2 (onoratoite), 1037. Apatite, equilibrium studies of, 539; Rhodesia and Uga~da, opt |  | | Journal (article/letter/editorial) | | seawater. The fluid is depleted in Ca and Mg and enriched in K, Rb, Cs and F due to interaction with rocks...part of the island. The simulation assumes different mixtures of seawater with groundwater and volcanic...fractures and faults, reaching temperatures of over 3008C in the southern part of the island where an...gases increase the amount of C and S in the system, lower the pH, and enhance the dissolution of trachyte...trachyte. After reaction with trachyte the pH increases and the fluid reaches saturation conditions with respect |
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Ascension Island, Saint Helena， Ascension and Tristan da Cunha