Bell, J.D. 1967. The occurrence of obsidian and other natural glasses on Ascension Island. Proceedings of the Geological Society, London, 1641, 179-181.

cogenetic origin. Earth and Planetary Science Letters: 82(3-4): 255-268. doi.org/10.1016/0012-821X(87)90200-7

Daly, R.A. (1925) The geology of Ascension Island. Proceedings of the American Academy of Arts and Sciences: 60: 1-80. doi.org/10.2307/25130043

Van Tassel, R. [with a microchemical analysis by Hey, M.H.] (1952) Dalyite, a new potassium zirconium silicate, from Ascension Island, Atlantic. Mineralogical Magazine: 29(217): 850-857.

Atkins, F.B., Baker, P.E., Bell, J.D., Smith, D.G.W. (1964) Oxford expedition to Ascension Island, 1964. Nature: 204: 722-724.

Gast, P.W., Tilton, G.R., Hedge, C. (1964) Isotopic composition of lead and strontium from Ascension and Gough islands. Science: 145(3637): 1181-1185.

Roedder, E., Coombs, D.S. (1967) Immiscibility in granitic melts, indicated by fluid inclusions in ejected granitic blocks from Ascension Island. Journal of Petrology: 8(3): 417-451.

Thomé, Raoul C. Mitchell (1970) Geology of the South Atlantic Islands - Beiträge Zur Regionalen Geologie der Erde No. 10. Gerbrüder Borntraeger.

Harris, C., Bell, J.D. (1982) Natural partial melting of syenite blocks from Ascension Island. Contributions to Mineralogy and Petrology: 79(2): 107-113.

Harris, C., Bell, J.D., Atkins, F.B. (1982) Isotopic composition of lead and strontium in lavas and coarse-grained blocks from Ascension Island, South Atlantic. Earth and Planetary Science Letters: 60(1): 79-85.

Harris, C. (1983) The petrology of lavas and associated plutonic inclusions of Ascension Island. Journal of Petrology: 24(4): 424-470. doi.org/10.1093/petrology/24.4.424

Weis, D. (1983) Pb isotopes in Ascension Island rocks: Oceanic origin for the gabbroic to granitic plutonic inclusions. Earth and Planetary Science Letters: 62(2): 273-282. doi.org/10.1016/0012-821X(83)90090-0

Harris, C. (1985) Guano-derived rare earth-rich phosphatic amygdales in gabbroic inclusions from Ascension Island. Earth and Planetary Science Letters: 72(1): 141-148.

Sheppard, S.M.F., Harris, C. (1985) Hydrogen and oxygen isotope geochemistry of Ascension Island lavas and granites: Variation with crystal fractionation and interaction with sea water. Contributions to Mineralogy and Petrology: 91(1): 74-81.

Harris, C., Sheppard, S.M.F. (1987) Magma and fluid evolution in the lavas and associated granite xenoliths of Ascension Island. In: Alkaline Igneous Rocks (Fitton, J.G., Upton, B.G.J. eds.), Geological Society of London: Special Publication 30: 269-272.

Weaver, B.L., Wood, D.A., Tarney, J., Joron, J.-L. (1987) Geochemistry of ocean island basalts from the South Atlantic Ocean: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha. In: Alkaline Igneous Rocks (Fitton, J.G., Upton, B.G.J. eds.), Geological Society of London: Special Publication 30: 253-267.

Weis, D., Demaiffe, D., Cauet, S., Javoy, M. (1987) Sr, Nd, O and H isotopic ratios in Ascension Island lavas and plutonic inclusions

Weaver, B.L., Kar, A., Davidson, J., Colucci, M. (1996) Geochemical characteristics of volcanic rocks from Ascension Island, South Atlantic Ocean. Geothermics: 25(4-5): 449-470.

Kar, A., Weaver, B.L., Davidson, J., Colucci, M. (1998) Origin of differentiated volcanic and plutonic rocks from Ascension Island, South Atlantic Ocean. Journal of Petrology: 39(5): 1009-1024. doi.org/10.1093/petroj/39.5.1009

Jicha, B. R., Singer, B. S., & Valentine, M. J. (2013). 40Ar/39Ar geochronology of subaerial Ascension Island and a re-evaluation of the temporal progression of basaltic to rhyolitic volcanism. Journal of Petrology, 54(12), 2581-2596. doi.org/10.1093/petrology/egt058

Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4

Reference Search (possible matching items)

	*Baker, Ian (1968) Intermediate oceanic volcanic rocks and the ‘Daly gap’. Earth and Planetary Science Letters, 4 (2) 103-106 doi:10.1016/0012-821x(68)90002-2*	Journal (article/letter/editorial)
	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...basalt - trachyte - phonolite assemblage on Saint Helena demonstrate a decrease from basic to salic ends... resulted in bimodal distributions of collected and analyzed rock types. Volumetric data of this type...abundant than end members o f the series (i.e. basalt and trachyte, phonolite or rhyolite). Largely as a result
	*Miyashiro, Akiho (1978) Nature of alkalic volcanic rock series. Contributions to Mineralogy and Petrology, 66 (1) 91-104 doi:10.1007/bf00376089*	Journal (article/letter/editorial)
	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
	*HARRIS, C. (1983) The Petrology of Lavas and Associated Plutonic Inclusions of Ascension Island. Journal of Petrology, 24 (4) 424-470 doi:10.1093/petrology/24.4.424*	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
	*Marsh, Julian S. (2010) The geochemistry and evolution of Palaeogene phonolites, central Namibia. Lithos, 117 (1) 149-160 doi:10.1016/j.lithos.2010.02.012*	Journal (article/letter/editorial)
	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
	Harris, Chris, Smith, H. Stuart, le Roex, Anton P. (2000) Oxygen isotope composition of phenocrysts from Tristan da Cunha and Gough Island lavas: variation with fractional crystallization and evidence for assimilation. Contributions to Mineralogy and Petrology, 138 (2) 164-175 doi:10.1007/s004100050015	Journal (article/letter/editorial)
	phenocrysts from Tristan da Cunha and Gough Island lavas: variation with fractional crystallization and evidence...clinopyroxene and plagioclase) present in lavas from Tristan da Cunha and Gough Island. These islands...mantle plume, have enriched radiogenic isotope ratios and are, therefore, prime candidates for an oxygen isotope...pyroxene and feldspar in the Gough lavas show that the phenocrysts in the ma®c Gough Island lavas are...contained <2% recycled sediment. In contrast, the Tristan lavas with SiO2 >48 wt% contain phenocrysts which
	*Fitton, J. G., Upton, B. G. J. - Eds.* (1987) Alkaline Igneous Rocks. Special Publication Vol. 30. Geological Society of London**	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
	Viccaro, Marco, Scribano, Vittorio, Cristofolini, Renato, Ottolini, Luisa, Manuella, Fabio C. (2009) Primary origin of some trachytoid magmas: Inferences from naturally quenched glasses in hydrothermally metasomatized gabbroic xenoliths (Hyblean area, Sicily) Lithos, 113 (3) 659-672 doi:10.1016/j.lithos.2009.06.037	Journal (article/letter/editorial)
	Fe–Mg-rich clays, aegirine–augite, ± zeolites, titanite, apatite, magnetite, and hydrothermal zircon...(700– 1600 ppm) and F (N 500 ppm) were also detected in the glass. Careful macroscopic and microscopic observations...assemblages and the feldspar grains, along with comparisons between chemical compositions of the glass and the...Na-rich alkali feldspar, Fe–Mgrich clays and aegirine–augite. Halogens had probably played an important...A number of within-plate volcanoes from oceanic and continental geodynamic settings erupts modest amounts
	le Roex, A., Class, C., O'Connor, J., Jokat, W. (2010) Shona and Discovery Aseismic Ridge Systems, South Atlantic: Trace Element Evidence for Enriched Mantle Sources. Journal of Petrology, 51 (10) 2089-2120 doi:10.1093/petrology/egq050	Journal (article/letter/editorial)
	2089^2120 2010 doi:10.1093/petrology/egq050 Shona and Discovery Aseismic Ridge Systems, South Atlantic:...ANTON LE ROEX1, CORNELIA CLASS2, JOHN O’CONNOR3 AND* WILFRIED JOKAT4 1 DEPARTMENT OF GEOLOGICAL SCIENCES...Ridge^Meteor Rise^Agulhas Ridge^Cape Rise seamounts) and the Discovery Rise to the north have been argued...to represent the surface expressions of the Shona and Discovery mantle plumes, based on enriched samples...Mid-Atlantic Ridge, a single sample from Discovery Rise and tectonic reconstructions. Leg PS69 ANT XXIII/5 of
	Harris, Chris, Dreyer, Tanya, le Roux, Petrus (2018) Petrogenesis of peralkaline granite dykes of the Straumsvola complex, western Dronning Maud Land, Antarctica. Contributions to Mineralogy and Petrology, 173 (1) doi:10.1007/s00410-017-1433-2	Journal (article/letter/editorial)
	Contributions to Mineralogy and Petrology (2018) 173:8 https://doi.org/10.1007/s00410-017-1433-2 ORIGINAL...Springer Nature 2017 Abstract Peralkaline syenite and granite dykes cut the Straumsvola nepheline syenite...29) and manifests itself in the presence of the Zr silicates eudialyte, dalyite and vlasovite, and the...nepheline syenite pluton, and the petrogenetic relationship of the dykes and the pluton cannot be related...exists between silicaundersaturated and oversaturated magmas. Major and trace element variations in the dykes
	Weidendorfer, Daniel, Schmidt, Max W., Mattsson, Hannes B. (2016) Fractional crystallization of Si-undersaturated alkaline magmas leading to unmixing of carbonatites on Brava Island (Cape Verde) and a general model of carbonatite genesis in alkaline magma suites. Contributions to Mineralogy and Petrology, 171 (5) doi:10.1007/s00410-016-1249-5	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
	ROEDDER, E., COOMBS, D. S. (1967) Immiscibility in Granitic Melts, Indicated by Fluid Inclusions in Ejected Granitic Blocks fromAscension Island. Journal of Petrology, 8 (3) 417-451 doi:10.1093/petrology/8.3.417	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
	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...aenigmatite, ilmenite, and magnetite: (1) augite + fayalite + ilmenite + magnetite, (2) augite + fayalite + ilmenite...hedenbergite or aegirine-augite + ilmenite + aenigmatite + quartz ± ferrorichterite, and (5) aegirine-augite + aenigmatite...phyric phase in each assemblage. Whole-rock silica and peralkalinity correlate strongly with the mineral
	Sjöqvist, Axel S.L., Cornell, David H., Andersen, Tom, Christensson, Ulf I., Berg, Johan T. (2017) Magmatic age of rare-earth element and zirconium mineralisation at the Norra Kärr alkaline complex, southern Sweden, determined by U–Pb and Lu–Hf isotope analyses of metasomatic zircon and eudialyte. Lithos, 294. 73-86 doi:10.1016/j.lithos.2017.09.023	Journal (article/letter/editorial)
	Accepted Manuscript Magmatic age of rare-earth element and zirconium mineralisation at the Norra Kärr alkaline...Sweden, determined by U–Pb and Lu–Hf isotope analyses of metasomatic zircon and eudialyte Axel S.L. Sjöqvist...Johan T. Berg , Magmatic age of rare-earth element and zirconium mineralisation at the Norra Kärr alkaline...Sweden, determined by U–Pb and Lu–Hf isotope analyses of metasomatic zircon and eudialyte. The address for...manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published
	Harris, C., Marsh, J. S., Milner, S. C. (1999) Petrology of the Alkaline Core of the Messum Igneous Complex, Namibia: Evidence for the Progressively Decreasing Effect of Crustal Contamination. Journal of Petrology, 40 (9) 1377-1397 doi:10.1093/petroj/40.9.1377	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
	Weis, D., Liégeois, J.P., Javoy, M. (1986) The Timedjealen alkaline ring-complex and related N/1bS dyke swarms (Adrar des Iforas, Mali) — A Pb/1bSr/1bO isotopic study. Chemical Geology, 57 (1) 201-215 doi:10.1016/0009-2541(86)90103-8	Journal (article/letter/editorial)
	Netherlands 201 THE TIMEDJELALEN ALKALINE RING-COMPLEX AND RELATED N-S DYKE SWARMS (ADRAR DES IFORAS, MALl)...Pb-Sr-O ISOTOPIC STUDY D. WEIS 1'2', J.P. LII~GEOIS 3 and* M. JAVOY 1 ~Laboratoire de G~ochimie des Isotopes...D., Li~geois, J.P. and Javoy, M., 1986. The Timedjelalen alkaline ring-complex and related N-S dyke swarms...Mali) - - A Pb-Sr-O isotopic study. In: S. Deutsch and A.W. Hofmann (Editors), Isotopes in Geology - - Picciotto...acid dyke swarms, plateaux of ignimbritic and rhyolitic lavas, and silica-oversaturated ring-complexes. This
	Ridolfi, F., Renzulli, A., Santi, P., Upton, B. G. J. (2003) Evolutionary stages of crystallization of weakly peralkaline syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (São Miguel, Azores Islands) Mineralogical Magazine, 67 (4) 749-767 doi:10.1180/0026461036740131	Journal (article/letter/editorial)
	Islands) F. RIDOLFI1, A. RENZULLI1,, P. SANTI1 1 2 AND* B. G. J. UPTON2 Istituto di Vulcanologia e Geochimica...Urbino, I-61029 Urbino, Italy Department of Geology and Geophysics, University of Edinburgh, EH9 3JW Edinburgh...Islands) are divisible into (1) silica-undersaturated and (2) silica-saturated/oversaturated groups. The first...syenites of both groups crystallized at shallow depths and whole-rock geochemistry shows that they have compositions...during which most of the feldspar growth occurred; and (3) a late interstitial stage. Crystallization of
	Amores-Casals, Sandra, Gonçalves, Antonio Olimpio, Melgarejo, Joan-Carles, Martí Molist, Joan (2019) Nb and REE Distribution in the Monte Verde Carbonatite–Alkaline–Agpaitic Complex (Angola) Minerals, 10 (1) 5 doi:10.3390/min10010005	Journal (article/letter/editorial)
	minerals Article Nb and REE Distribution in the Monte Verde Carbonatite–Alkaline–Agpaitic Complex (Angola)...Antonio Olimpio Gonçalves 3 , Joan-Carles Melgarejo 1 and Joan Martí Molist 4 1 2 3 4 * Departament de Mineralogia...complex of Monte Verde has a semi-circular shape and is comprised of a central intrusion of foidolite...concentrically arranged minor bodies of other alkaline rocks and carbonatite magmatic breccias. This rock association...(HFSE) and rare earth elements (REE) are concentrated in pyrochlore crystals in the carbonatite and alkaline
	Obeid, Mohamed A., Lalonde, André E. (2013) THE GEOCHEMISTRY AND PETROGENESIS OF THE LATE CRETACEOUS ABU KHURUQ ALKALINE COMPLEX, EASTERN DESERT, EGYPT. The Canadian Mineralogist, 51 (4) 537-558 doi:10.3749/canmin.51.4.537	Journal (article/letter/editorial)
	DOI : 10.3749/canmin.51.4.537 THE GEOCHEMISTRY AND PETROGENESIS OF THE LATE CRETACEOUS ABU KHURUQ ALKALINE...essexite, nepheline syenite, and quartz syenite, as well as quartz- and nephelinebearing pegmatites....dominantly metaluminous and enriched in both large-ion lithophile (LIL) and high-field-strength (HFS)...fractionated REE patterns [5.6 < (La/Yb)n < 18.6], and possess the geochemical characteristics of anorogenic...significantly different from those of the essexite unit and the essexitic xenoliths found in the nepheline syenite
	LEGENDRE, C., MAURY, R. C., CAROFF, M., GUILLOU, H., COTTEN, J., CHAUVEL, C., BOLLINGER, C., HÉMOND, C., GUILLE, G., BLAIS, S., ROSSI, P., SAVANIER, D. (2005) Origin of Exceptionally Abundant Phonolites on Ua Pou Island (Marquesas, French Polynesia): Partial Melting of Basanites Followed by Crustal Contamination. Journal of Petrology, 46 (9) 1925-1962 doi:10.1093/petrology/egi043	Journal (article/letter/editorial)
	of Exceptionally Abundant Phonolites on Ua Pou Island (Marquesas, French Polynesia): Partial Melting...cover 65% of the surface of the island whereas mafic lavas cover 27% and intermediate ones 8%. The silica-undersaturated...primitive basanites, leaving an amphibole-rich residuum and producing tephriphonolitic magmas. These tephriphonolitic...E-mail: christelle.legendre@univ-nantes.fr (Group C) and extreme fractionation coupled with assimilation of...volcanics). They are generally associated in space and time with basanitic lavas, whereas trachytes are
	*Eby, G.Nelson (1990) The A-type granitoids: A review of their occurrence and chemical characteristics and speculations on their petrogenesis. Lithos, 26 (1) 115-134 doi:10.1016/0024-4937(90)90043-z*	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
	Bailey, D. K., Macdonald, R. (1970) Petrochemical variations among mildly peralkaline (comendite) obsidians from the oceans and continents. Contributions to Mineralogy and Petrology, 28 (4) 340-351 doi:10.1007/bf00388955	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
	*Nockolds, S. R., Knox, R. W. O'B., Chinner, G. A. (1978) Petrology for Students. Cambridge University Press, Cambridge.*	Book
	Great Britain by Cox & Wyman Ltd, London, Fakenham and Reading Library of Congress cataloguing in publication...rocks and their textures The classification of igneous rocks Granitic rocks Silicic volcanic and hypabyssal...hypabyssal rocks Syenites Trachytes and microsyenites Monzonites, monzodiorites, monzogabbros Latites, latite-andesites...latite-andesites, allied volcanics and their hypabyssal equivalents Diorites Andesites and their hypabyssal equivalents...Gabbros and related rocks Basalts and dolerites Ultramafic igneous rocks Nepheline syenites and allied
	*(1990) X-Ray and Optical Data for a Rare Earth–Poor Eudialyte from the North–Central Alaska Range. Powder Diffraction, 5 (2) 89-92 doi:10.1017/s0885715600015402*	Journal (article/letter/editorial)
	X-Ray and Optical Data for a Rare Earth-Poor Eudialyte from the North-Central Alaska Range By Neil E...Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, U.S...S.A. Mickey E. Gunter Department of Geology and Geological Engineering, University of Idaho, Moscow...A. Diana N. Solie Alaska Division of Geological and Geophysical Surveys, 3700 Airport Way, Fairbanks...U.S.A. Charles R. Knowles Department of Geology and Geological Engineering, University of Idaho, Moscow
	Barbey, Pierre, Ayalew, Dereje, Yirgu, Gezahegn (2005) Insight into the origin of gabbro-dioritic cumulophyric aggregates from silicic ignimbrites: Sr and Ba zoning profiles of plagioclase phenocrysts from Oligocene Ethiopian Plateau rhyolites. Contributions to Mineralogy and Petrology, 149 (2) 233-245 doi:10.1007/s00410-004-0647-2	Journal (article/letter/editorial)
	cumulophyric aggregates from silicic ignimbrites: Sr and Ba zoning profiles of plagioclase phenocrysts from...54), augite, pigeonite and Ti-magnetite, instead of anorthoclase, sodic sanidine, aegirine-augite and...isolated within a glassy matrix or forming gabbroic and dioritic cumulophyric clots. Plagioclase is partially...normal with An-rich core (An45–54) and more sodic rim (An19–28). Ba and Sr concentration proﬁles of two...with compositions ranging from 250 ppm to 1,060 ppm and from 400 ppm to 1,590 ppm, respectively. The matrix
	*Baker, P. E., Buckley, F., Holland, J. G. (1974) Petrology and geochemistry of Easter Island. Contributions to Mineralogy and Petrology, 44 (2) 85-100 doi:10.1007/bf00385783*	Journal (article/letter/editorial)
	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)

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 1, 2024 20:37:33

Go to top of page

Aegirine-augite from Ascension Island, Saint Helena， Ascension and Tristan da Cunha

Aegirine-augite from
Ascension Island, Saint Helena， Ascension and Tristan da Cunha