 | 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 |  | | 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 |  | | Journal (article/letter/editorial) | | 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...volcanic rocks from this or any other Atlantic island. The unique chemistry is also reflected in the...remain enigmatic. Introduction St. Helena is a volcanic island situated in the South Atlantic (5'40'W; |  | | Journal (article/letter/editorial) | | 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 |  | | 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 |  | | Book (volume) | | 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 |  | | Journal (article/letter/editorial) | | 227 A second occurrence of dalyite and the petrology of some ejected syenite blocks from $5o Miguel...Miguel, Azores By J. R. CAN~ Department of Mineralogy and Petrology, Downing Place, Cambridge1 [Taken as read...assemblage sanidinearfvedsonite-quartz-aegirine-fayalite-astrophyllite-dalyite-pyrrhite. Other blocks from...century (Hartung, 1860; Miigge, 1883; Osann, 1888) and have been studied occasionally since those times...geological cruise, and the opportunity was taken to visit Serra de Agua de Pau and to collect a number |  | | Report (issue) | | Crystals short prismatic, to 0.5 mm, dominated by f101g and pinacoids k to [001]. Twinning: Not uncommon, with...Physical Properties: Cleavage: Distinct on f101g and f010g, indistinct on f100g. Tenacity: Brittle. Hardness...912(2) ® = 106± 14(2)0 X-ray Powder Pattern: Ascension Island. 4.20 (vs), 3.58 (vs), 3.08 (vs), 5.90 (s)...02 0.11 0.04 15.60 0.04 100.91 99.94 (1) Ascension Island; corresponds to (K1:79 Na0:32 )§=2:11 Zr1:01...of alkalic granite in trachytic and basaltic tu®s (Ascension Island); in syenite (Serra de Agua de Pau |  | | Journal (article/letter/editorial) | | Crustal Contamination CHRIS HARRIS1∗, JULIAN S. MARSH2 AND SIMON C. MILNER3 1 DEPARTMENT OF GEOLOGICAL SCIENCES...sub-alkaline suite, (2) an outer quartz syenite suite, and (3) an inner silicaundersaturated suite dominated...explained by fractional crystallization, but Sr- and O-isotope data indicate that these rocks contain...syenites trend towards the 0·1 GPa phonolite minimum and appear to have evolved by closed system fractional...element and Nd- and Sr-isotope characteristics that are similar to those of basanites from Tristan da Cunha |  | | Report (issue) | | commonly as subrounded to irregularly shaped grains and aggregates of such grains. Twinning: Twin plane f010g...to (Na; K; Ca)2:00 Zr0:96 Si 3:91O 11 : (2) Ascension Island; corresponds to (Na; K; Ca)2:02 Zr0:97 Si...phase in nepheline syenites, syenitic pegmatites, and along the contact zone of a di®erentiated alkalic...cavities in ejected blocks of peralkalic granite (Ascension Island). Association: Eudialyte, microcline, albite... magnesio-katophorite, aegirine, aenigmatite, fayalite, pyrochlore, apatite, °uorite. Distribution: In |  | Harris, C., Cressey, G., Bell, J. D., Atkins, F. B., Beswetherick, S. (1982) An occurrence of rare-earth-rich eudialyte from Ascension Island, South Atlantic. Mineralogical Magazine, 46 (341) 421-425 doi:10.1180/minmag.1982.046.341.02 | Journal (article/letter/editorial) | | eudialyte from Ascension Island, South Atlantic C. HARRIS, G. CRESSEY, J. D. BELL, F. B. ATKINS, AND S. BESWETHERICK...BESWETHERICK Department of Geology and Mineralogy, Parks Road, Oxford ABSTRACT. A mineral closely resembling...perthite granites. The only singlecrystal X-ray pattern and chemistry has been found specimen found to contain...Post area on 30(1)] falls within group (iii). Ascension Island. To our knowledge, eudialyte has not Petrographically...silicates, consists of perthite and quartz (often showing dalyite and vlasovite.Textural evidencesuggests |  | | Journal (article/letter/editorial) | | s i o n B y S. G. FLEET and J. R. CAN~1 D e p a r t m e n t of Mineralogy and Petrology, D o w n i n g..., previously reported as monoclinic by Pyatenko and Voronkov from an occurrence in the Kola Peninsula...from Ascension Island in a triclinic twinned modification. The obliquity is very slight (~ and ~, differ...differ from 90 ~ by less than l~ and X-ray photographs show arrays of paired spots corresponding to diffraction...followed on a single-crystal X-ray heating camera, and the obliquity is found to have successively smaller |  | | 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) | | 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 |  | | Journal (article/letter/editorial) | | elsevier.comrlocaterchemgeo The effect of water and f O 2 on the ferric–ferrous ratio of silicic melts...at 200 MPa, between 8008C and 10008C and for f O 2 between NNO y 1.35 and NNO q 6.6. Water-saturated...obsidian glasses Žone peraluminous and the other peralkaline. and a synthetic rhyolitic glass having...Pinatubo dacite. Ferrous iron was analyzed by titration and FeOtot by electron microprobe. Variation of quench...ferric–ferrous ratios higher than calculated from the Kress and Carmichael ŽKC. ŽKress, V.C., Carmichael, I.S.E. |  | | Journal (article/letter/editorial) | | S.P. TurneP, J.D. Foden ~ and R.S. Morrison" "The Department of Geology and Geophysics. Ut~iversio,of...Australia bGeological Survey. Department of Mine~ and Energ3". GPO Box 2655 Alwe Springs, N, T.. 5 750...1991; revised and accepted January 31, 1992) LITHOS ~ ~ Turner, S.P., Foden, J.D. and Morrison. R.S...petrogenetic schemes have been proposed for A-type granitic and volcanic rocks, many involving melting of l-type...models can be shown to have several shortcomings and whilst there may be various kinds of A-type magmas |  | | Journal (article/letter/editorial) | | granitoids: A review of their occurrence and chemical characteristics and speculations on their petrogenesis...occurrence and chemical charactenstics and speculations on theIr petrogenesIs. In: A.R. Woolley and M. Ross...Ross (EdItors), Alkaline igneous rocks and carbonatites. Lithos, 26: 115-134. A variety of granitoid sUItes...composition from quartz syenites to peralkaline granites and their respective volcamc equivalents. These sUItes...emplaced mto non-orogenic settmgs - both within plate and along plate margins during the waning stages of |  | White, J. C., Ren, M., Parker, D. F. (2005) VARIATION IN MINERALOGY, TEMPERATURE, AND OXYGEN FUGACITY IN A SUITE OF STRONGLY PERALKALINE LAVAS AND TUFFS, PANTELLERIA, ITALY. The Canadian Mineralogist, 43 (4) 1331-1347 doi:10.2113/gscanmin.43.4.1331 | Journal (article/letter/editorial) | | MINERALOGY, TEMPERATURE, AND OXYGEN FUGACITY IN A SUITE OF STRONGLY PERALKALINE LAVAS AND TUFFS, PANTELLERIA...ABSTRACT Eight samples of pantelleritic lava and tuff and a lithic inclusion of trachyte from Pantelleria...the presence of fayalite, aenigmatite, ilmenite, and magnetite: (1) augite + fayalite + ilmenite + magnetite... (2) augite + fayalite + ilmenite, (3) hedenbergite or sodian hedenbergite + fayalite + ilmenite + aenigmatite...ilmenite + aenigmatite + quartz ± ferrorichterite, and (5) aegirine-augite + aenigmatite + quartz. Alkali |  | | Journal (article/letter/editorial) | | 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 |  | REN, M, OMENDA, P, ANTHONY, E, WHITE, J, MACDONALD, R, BAILEY, D (2006) Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex, East African Rift, Kenya. Lithos, 91 (1) 109-124 doi:10.1016/j.lithos.2006.03.011 | Journal (article/letter/editorial) | | QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex, East...trachytes and pantellerites. The phenocryst assemblage in the trachytes is sanidine + fayalite + ferrohedenbergite...ferrohedenbergite + fayalite + aenigmatite + ferrorichterite + pyrrhotite ± apatite, although fayalite, ferrohedenbergite...ferrohedenbergite and ilmenite are absent from more evolved rocks (e.g. with SiO2 N 71%). QUILF temperature...calculations for the trachytes range from 709 to 793 °C and for the pantellerites 668–708 °C, the latter temperatures |  | 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) | | Gu, J. SCHMITT,Z. CHEN, L. LIANG, and J. F. MCCARTHY: Adsorption and desorption of different organic matter... N. GLUD, K. JENSEN, and N. P. REVSBECH: Diffusivity in surficial sediments and benthic mats determined...microsensor. I. A. MUNZ, B. W. D. YARDLEY, D. A. BANKS, and D. WAYNE: Deep penetration of sedimentary fluids...from hydrocarbon and brine inclusions in quartz veins. S. CHAKRABORTY, D. B. DLNGWELL, and D. C. RUBIE: Multicomponent...Experimental measurements. S. CHAKRABORTY, D. B. DINGWELL, and D. C. RUBIE: Multicomponent diffusion in ternary |  | Sokolova, E., Hawthorne, F. C., Ball, N. A., Mitchell, R. H., Della Ventura, G. (2006) Vlasovite, Na2Zr(Si4O11), from the Kipawa alkaline complex, Quebec, Canada: crystal-structure refinement and infrared spectroscopy. The Canadian Mineralogist, 44 (6) 1349-1356 doi:10.2113/gscanmin.44.6.1349 | Journal (article/letter/editorial) | | CRYSTAL-STRUCTURE REFINEMENT AND INFRARED SPECTROSCOPY ELENA SOKOLOVA§, FRANK C. HAWTHORNE AND NEIL A. BALL Department...Si sites with a grand distance of 1.612 Å, and one octahedrally coordinated Zr site with ...split into two subsites, Na(2A) and Na(2B), with a separation of 0.829 Å, and the symmetry-related Na(2B)...octahedrally coordinated, and Na(2B) is [5]-coordinated, and their occupancies are 0.826(8) and 0.092(4) Na, respectively...respectively. Thus the Na(1) and aggregate Na(2) sites are each fully occupied. In the crystal structure |  | | 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 |
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