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Titolo:
COUPLED MOLYBDENUM AND NIOBIUM DEPLETION IN CONTINENTAL BASALTS
Autore:
FITTON JG;
Indirizzi:
UNIV EDINBURGH,DEPT GEOL & GEOPHYS,W MAINS RD EDINBURGH EH9 3JW MIDLOTHIAN SCOTLAND
Titolo Testata:
Earth and planetary science letters
fascicolo: 3-4, volume: 136, anno: 1995,
pagine: 715 - 721
SICI:
0012-821X(1995)136:3-4<715:CMANDI>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
OCEANIC BASALTS; UNITED-STATES; HIGH-PRESSURE; NB; EVOLUTION; MANTLE; EARTH; TEMPERATURE; SIDEROPHILE; CONSTRAINTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
J.G. Fitton, "COUPLED MOLYBDENUM AND NIOBIUM DEPLETION IN CONTINENTAL BASALTS", Earth and planetary science letters, 136(3-4), 1995, pp. 715-721

Abstract

Molybdenum concentrations have been determined for a suite of Late Cenozoic basalt lavas from the Basin and Range province of the western United States. Lavas older than about 5 Ma, which are thought to have had a lithospheric mantle source, are strongly depleted in Nb and Mo relative to La and Nd, respectively. Lavas younger than 5 Ma, which are chemically and isotopically similar to ocean island basalt, show no such depletion in either Nb or Mo. A dose geochemical coherence between Nb and Mo is consistent with their similar ionic radii (Nb5+, 0.64; Mo4+, 0.65). Both elements are probably retained in residual rutile in adehydrating subducted slab, while the overlying lithospheric mantle is enriched in large-ion lithophile elements (including light REE), contained in silica-rich hydrous fluids expelled from the slab.

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Documento generato il 27/11/20 alle ore 04:06:15