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

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.

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

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. (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

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

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)

	(1987) Geochemistry of ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha. Special Publication, 30. Geological Society of London. 253-267 doi:10.1144/gsl.sp.1987.030.01.11	Report (chapter)
	ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha...Cunha Barry L. Weaver, David A. Wood, John Tarney and Jean Louis Joron Geological Society, London, Special...ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha...David A. Wood, John Tarney and Jean Louis Joron S U M M A R Y: Basaltic and hawaiitic lavas from the S...Atlantic Ocean islands of Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha have been analysed for
	*(2013) Geochronology (Ar/Ar and K–Ar) of the South Atlantic post-break-up magmatism. Special Publication, 369. Geological Society of London. 41-74 doi:10.1144/sp369.21*	Report (chapter)
	Geochronology (Ar/Ar and K– Ar) of the South Atlantic post-break-up magmatism M. C. GERALDES1, A. MOTOKI1...integrates the available geological information and* geochronology data for the Cretaceous– Recent magmatism...onshore and offshore magmatic events, including the oceanic islands along the transform faults and near...igneous rocks and their tectonic settings allows new insights into the evolution of the African and Brazilian...a common characteristic of almost all Brazilian and West African marginal basins. However, rocks ascribed
	*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
	*Bourdon, E., Hémond, C. (2001) Looking for the "missing endmember" in South Atlantic Ocean mantle around Ascension Island. Mineralogy and Petrology, 71 (1) 127-138 doi:10.1007/s007100170049*	Journal (article/letter/editorial)
	Mineralogy and Petrology (2001) 71: 127±138 Looking for the ``missing endmember'' in South Atlantic...Atlantic Ocean mantle around Ascension Island E. Bourdon1 and C. HeÂmond1;2 1 UMR 6538 ``Domaines OceÂaniques''...2000 Summary Published bathymetric, geophysical and geochemical data suggest the presence of a hotspot...between the Bode Verde and Ascension fracture zones, in the vicinity of Ascension Island which has been named...named Ascension hotspot. We provide here new isotope and trace element data on Grattan (a near-ridge seamount)
	*Thomé, Raoul C. Mitchell (1970) Geology of the South Atlantic Islands* - Beiträge Zur Regionalen Geologie der Erde No. 10. Gerbrüder Borntraeger.**	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
	Weaver, Barry L. (1990) Geochemistry of highly-undersaturated ocean island basalt suites from the South Atlantic Ocean: Fernando de Noronha and Trindade islands. Contributions to Mineralogy and Petrology, 105 (5) 502-515 doi:10.1007/bf00302491	Journal (article/letter/editorial)
	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
	O'NIONS, R. K., PANKHURST, R. J. (1974) Petrogenetic Significance of Isotope and Trace Element Variations in Volcanic Rocks From the Mid-Atlantic. Journal of Petrology, 15 (3) 603-634 doi:10.1093/petrology/15.3.603	Journal (article/letter/editorial)
	Isotope and Trace Element Variations in Volcanic Rocks From the Mid-Atlantic by R. K. O'NIONS and R. J ...together with determinations of Rb, Sr, K2O, Na2O and, in a few cases, other elements, are reported for...basalts from the Reykjanes Ridge and Charlie Gibbs Fracture Zone, and an enstatite-forsterite basalt from...tholeiites have uniformly low "Sr/^Sr ratios (0'70294±4) and lithophile element contents compared with the most...has not been confirmed. In contrast, the ocean island alkali basalts generally have higher "Sr/^Sr ratios
	Graham, David W., Jenkins, William J., Schilling, Jean-Guy, Thompson, Geoffrey, Kurz, Mark D., Humphris, Susan E. (1992) Helium isotope geochemistry of mid-ocean ridge basalts from the South Atlantic. Earth and Planetary Science Letters, 110 (1) 133-147 doi:10.1016/0012-821x(92)90044-v	Journal (article/letter/editorial)
	Earth and Planetary Science Letters, 110 (1992) 133-147 Elsevier Science Publishers B.V., Amsterdam ...Schilling c, Geoffrey T h o m p s o n Mark D. Kurz a and Susan E. Humphris a a a Woods Hole Oceanographic...Graduate School of Oceanography, University of Rhode Island, Kingston, RI 02881, USA Received May 13, 1991;...between I°N and 47°S. 3He/4He in South Atlantic mid-ocean ridge basalts (MORB) varies between 6.5 and 9.0 R...from high 3He/aHe hotspots such as Iceland. He, Sr and Pb isotopes show systematic relationships along the
	Ferguson, A. K., Cundari, A. (1975) Petrological aspects and evolution of the leucite bearing Lavas from Bufumbira, south west Uganda. Contributions to Mineralogy and Petrology, 50 (1) 25-46 doi:10.1007/bf00385219	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
	Peyve, A. A., Skolotnev, S. G. (2014) Systematic variations in the composition of volcanic rocks in tectono-magmatic seamount chaines in the Brazil Basin. Geochemistry International, 52 (2) 111-130 doi:10.1134/s0016702914020062	Journal (article/letter/editorial)
	Seamount Chaines in the Brazil Basin A. A. Peyve and S. G. Skolotnev Geological Institute (GIN), Russian...whole structure, includ ing the Trindade and Martin Vaz Islands and the Abrolhos Plateau. The analogous isotopic...explained by a similar mechanism of melt derivation and the similar evolution of the mantle plume material...Pernambuco Seamounts con sisted of a mixture of DM and HIMU material with a certain admixture of EM I (or...Atlantic is interesting thanks to its typical long and variably ori ented tectonomagmatic seamount chains
	Skolotnev, S. G., Peive, A. A., Belyatskii, B. V. (2006) Geochemical and isotopic features of basalts in the axial Mid-Atlantic Ridge near the Martin Vaz Fracture Zone, South Atlantic (19°–20° S) Doklady Earth Sciences, 407 (2) 401-407 doi:10.1134/s1028334x06030135	Journal (article/letter/editorial)
	407, No. 6, pp. 798–805. GEOLOGY Geochemical and Isotopic Features of Basalts in the Axial Mid-Atlantic...Atlantic (19°–20° S) S. G. Skolotnev, A. A. Peive, and B. V. Belyatskii Presented by Academician Yu. M....spreading zone. Areas of two giant (St. Helena and Tristan da Cunha) plumes in the Mid-Atlantic Ridge (MAR)...anomalously high contents of lithophile components and specific isotopic compositions [1]. Moreover, the...adjacent sectors of the rift. The formation of the St. Helena Seamount located 400 km east of the MAR axis is
	Wyers, G. Paul, Barton, Michael (1986) Petrology and evolution of transitional alkaline ? sub alkaline lavas from Patmos, Dodecanesos, Greece: evidence for fractional crystallization, magma mixing and assimilation. Contributions to Mineralogy and Petrology, 93 (3) 297-311 doi:10.1007/bf00389389	Journal (article/letter/editorial)
	Contributions to Mineralogy and Petrology Contrib Mineral Petrol (1986) 93 :297-311 9 Springer-Verlag...Springer-Verlag 1986 Petrology and evolution of transitional alkalinesub alkaline lavas from Patmos, Dodecanesos...magma mixing and assimilation G. Paul Wyers and Michael Barton Department of Geology and Mineralogy, The...43210, USA Abstract. Petrographic, mineral chemical and whole-rock major oxide data are presented for the...about 7 m.y. ago and range in composition from ne-trachybasalts through hy-trachybasalts and trachyandesites
	*Ridley, W. Ian, Baker, and Ian (1973) The petrochemistry of a unique cordierite-bearing lava from St. Helena Island, South Atlantic. American Mineralogist, 58 (9-10) 813-818*	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;
	*MUIR, I. D., TILLEY, C. E., SCOON, J. H. (1964) Basalts from the Northern Part of the Rift Zone of the Mid-Atlantic Ridge. Journal of Petrology, 5 (3) 409-434 doi:10.1093/petrology/5.3.409*	Journal (article/letter/editorial)
	MUIR and c. E. T I L L E Y , with chemical analyses by j. H. SCOON Department of Mineralogy and Petrology...dredge hauls along with colonial branching corals and foraminifera from the central part of the Mid-Atlantic...the rocks come from two localities 5 miles apart and were collected during the autumn cruise of R.R.S...basalts or dolerites carrying a single pyroxene phase and most have transitional or slightly alkaline affinities...represented. Many of the specimens have chilled selvedges and can be shown to be pillow lavas. Important features
	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
	(1993) The isotope and trace element geochemistry of basalts from the volcanic islands of the southern Red Sea. Special Publication, 76. Geological Society of London. 455-467 doi:10.1144/gsl.sp.1993.076.01.24	Report (chapter)
	The isotope and trace element geochemistry of basalts from the volcanic islands of the southern Red Sea...Abstract: Alkali basalts from the Hanish-Zukur and Zubair island groups in the southern Red Sea have been analysed...elements and Sr, Nd and Pb isotopes. They have close to primary compositions with high Mg:~ (60-70) and Ni...Ni and Cr concentrations up to 298 ppm and 597 ppm respectively. Many have only experienced olivine fractionation...fractionation and this can be readily corrected. Compositional variations in the corrected analyses are
	*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
	*Afanas'yev, G.D. (1971) Structure and composition of terrestrial crust in relation to problems of geological petrology. International Geology Review, 13 (12) 1852-1870 doi:10.1080/00206817109475651*	Journal (article/letter/editorial)
	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
	*Nairn, Alan E. M., Stehli, Francis G. - Eds.* (1973) The Ocean Basins and Margins Vol. 1 - The South Atlantic. Plenum Press.**	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
	Cohen, R.S., O'Nions, R.K., Dawson, J.B. (1984) Isotope geochemistry of xenoliths from East Africa: Implications for development of mantle reservoirs and their interaction. Earth and Planetary Science Letters, 68 (2) 209-220 doi:10.1016/0012-821x(84)90153-5	Journal (article/letter/editorial)
	Earth and Planetary Science Letters, 68 (1984) 209-220 Elsevier Science Publishers B.V., Amsterdam -...of mantle reservoirs and their interaction R.S. Cohen 1,,, R.K. O'Nions 1 and J.B. Dawson 2 I Department...January 28, 1984 Pb, Nd and Sr isotope analyses together with U, Pb, Sm, Nd, Rb and Sr concentrations have...been obtained for separated phases of lherzolite and bulk rock mafic granulite xenoliths in Recent volcanics...yielded the least radiogenic Pb (2°6pb/2°4pb = 15.55) and Nd (143Nd/l'UNd = 0.51127; cOd = --26.7) isotope
	Paulick, H., Münker, C., Schuth, S. (2010) The influence of small-scale mantle heterogeneities on Mid-Ocean Ridge volcanism: Evidence from the southern Mid-Atlantic Ridge (7°30′S to 11°30′S) and Ascension Island. Earth and Planetary Science Letters, 296 (3) 299-310 doi:10.1016/j.epsl.2010.05.009	Journal (article/letter/editorial)
	Earth and Planetary Science Letters 296 (2010) 299–310 Contents lists available at ScienceDirect Earth...Earth and Planetary Science Letters j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o...southern Mid-Atlantic Ridge (7°30′S to 11°30′S) and Ascension Island H. Paulick a,⁎, C. Münker a,b,c, S. Schuth...MORB igneous geochemistry mantle convection Ascension Island volcanism mantle endmembers Hf isotopes mantle...Mid-Ocean Ridges is known to exhibit signiﬁcant isotopic and elemental variations, traditionally regarded as reﬂecting
	*(1989) Characterization of the St Helena magma source. Special Publication, 42. Geological Society of London. 257-276 doi:10.1144/gsl.sp.1989.042.01.16*	Report (chapter)
	Characterization of the St Helena magma source D. J. Chaffey, R. A. Cliff and B. M. Wilson Geological Society...on August 18, 2014 Characterization of the St Helena m a g m a source D. J. Chaffey, R. A. Cliff & B...isotope and trace-element data for St Helena are interpreted in terms of changing thermal and chemical...chemical fluxes impinging on and interacting with the base of the lithosphere over a period of 6 Ma. The data...two geochemically distinct components in the St Helena source region: (i) a HIMU (high U/Pb) component
	*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
	*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
	Weis, D., Demaiffe, D., Cauet, S., Javoy, M. (1987) Sr, Nd, O and H isotopic ratios in Ascension Island lavas and plutonic inclusions; cogenetic origin. Earth and Planetary Science Letters, 82 (3) 255-268 doi:10.1016/0012-821x(87)90200-7	Journal (article/letter/editorial)
	Earth and Planetary Science Letters, 82 (1987) 255-268 Elsevier Science Publishers B.V., Amsterdam -...Netherlands 255 [4] Sr, Nd, O and H isotopic ratios in Ascension Island lavas and plutonic inclusions; cogenetic...2, ,, D. D e m a i f f e 1, S. C a u e t 1 , . . and M. J a v o y 2 1 Laboratoires Associ$s G$ologie-...January 13, 1987 Eighteen basic rocks from Ascension Island (South Atlantic) give a mean S7Sr/86 Sr ratio...both volcanics and plutonic inclusions. The late-stage differentiated rocks (rhyolites and granitic inclusions)

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Plagioclase from Ascension Island, Saint Helena， Ascension and Tristan da Cunha

Plagioclase from
Ascension Island, Saint Helena， Ascension and Tristan da Cunha