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Titolo:
Constraints on mantle plumes from the helium isotopic composition of basalts from the British Tertiary Igneous Province
Autore:
Stuart, FM; Ellam, RM; Harrop, PJ; Fitton, JG; Bell, BR;
Indirizzi:
Scottish Univ Res & Reactor Ctr, Isotope Geosci Unit, E Kilbride G75 0QF, Lanark, Scotland Scottish Univ Res & Reactor Ctr E Kilbride Lanark Scotland G75 0QF otland Univ Manchester, Dept Earth Sci, Manchester M13 9PL, Lancs, England Univ Manchester Manchester Lancs England M13 9PL M13 9PL, Lancs, England Univ Edinburgh, Dept Geol & Geophys, Edinburgh EH9 3JW, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH9 3JW Midlothian, Scotland Univ Glasgow, Dept Geog, Div Earth Sci, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland G12 8QQ ow G12 8QQ, Lanark, Scotland
Titolo Testata:
EARTH AND PLANETARY SCIENCE LETTERS
fascicolo: 3-4, volume: 177, anno: 2000,
pagine: 273 - 285
SICI:
0012-821X(20000430)177:3-4<273:COMPFT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PALEOCENE LAVA-FIELD; WEST-CENTRAL SKYE; VOLCANIC PROVINCE; ICELAND PLUME; FLOOD BASALTS; GREENLAND; SCOTLAND; SYSTEMATICS; ISLAND; PB;
Keywords:
helium; isotopes; Scotland; mantle plumes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Stuart, FM Scottish Univ Res & Reactor Ctr, Isotope Geosci Unit, E Kilbride G75 0QF, Lanark, Scotland Scottish Univ Res & Reactor Ctr E Kilbride Lanark Scotland G75 0QF
Citazione:
F.M. Stuart et al., "Constraints on mantle plumes from the helium isotopic composition of basalts from the British Tertiary Igneous Province", EARTH PLAN, 177(3-4), 2000, pp. 273-285

Abstract

Helium isotopes have been measured in olivines from igneous rocks spanningthe history of the Palaeocene volcanic centre at the Isle of Skye, northwest of Scotland. He-3/He-4 in olivine phenocrysts from basalts from the SkyeLava Field are up to 22 times the atmospheric ratio which is consistent with their origin from the proto-Iceland mantle plume despite being erupted 1300 km from the plume axis. The He-3-anomaly of the Palaeocene starting plume in the North Atlantic appears to have been up to three times greater, for the same distance from the plume axis, than the modern Iceland plume. ThePb isotope and trace element (Delta Nb) composition of the least crustallycontaminated Skye magmas resemble North Atlantic MORB rather than Iceland basalts. The proto-Iceland plume head appears to have been dominated by upper mantle material with a small deep mantle He contribution rather than undiluted deep mantle material as predicted in the classic plume model. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 03:48:59