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Titolo:
The seismic anomaly beneath Iceland extends down to the mantle transition zone and no deeper
Autore:
Foulger, GR; Pritchard, MJ; Julian, BR; Evans, JR; Allen, RM; Nolet, G; Morgan, WJ; Bergsson, BH; Erlendsson, P; Jakobsdottir, S; Ragnarsson, S; Stefansson, R; Vogfjord, K;
Indirizzi:
Univ Durham, Dept Geol Sci, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE ept Geol Sci, Durham DH1 3LE, England US Geol Survey, Menlo Park, CA 94025 USA US Geol Survey Menlo Park CA USA94025 l Survey, Menlo Park, CA 94025 USA Princeton Univ, Dept Geol & Geophys Sci, Princeton, NJ 08544 USA PrincetonUniv Princeton NJ USA 08544 eophys Sci, Princeton, NJ 08544 USA Meteorol Off Iceland, Reykjavik, Iceland Meteorol Off Iceland Reykjavik Iceland Off Iceland, Reykjavik, Iceland Natl Energy Author, Reykjavik, Iceland Natl Energy Author Reykjavik Iceland Energy Author, Reykjavik, Iceland
Titolo Testata:
GEOPHYSICAL JOURNAL INTERNATIONAL
fascicolo: 3, volume: 142, anno: 2000,
pagine: F1 - F5
SICI:
0956-540X(200009)142:3<F1:TSABIE>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLUME; RIDGE; HOTSPOT; COMPLEX; ORIGIN; THIN; FLOW;
Keywords:
fracture zones; hotspots; Iceland; magmatism; mantle transition zone;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Foulger, GR Univ Durham, Dept Geol Sci, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE , Durham DH1 3LE, England
Citazione:
G.R. Foulger et al., "The seismic anomaly beneath Iceland extends down to the mantle transition zone and no deeper", GEOPHYS J I, 142(3), 2000, pp. F1-F5

Abstract

A 3-D teleseismic tomography image of the upper mantle beneath Iceland of unprecedented resolution reveals a subvertical low wave speed anomaly that is cylindrical in the upper 250 km but tabular below this. Such a morphological transition is expected towards the bottom of a buoyant upwelling. Our observations thus suggest that magmatism at the Iceland hotspot is fed by flow rising from the mantle transition zone. This result contributes to the ongoing debate about whether the upper and lower mantles convect separatelyor as one. The image also suggests that material flows outwards from Iceland along the Reykjanes Ridge in the upper 200 km, but is blocked in the upper 150 km beneath the Tjornes Fracture Zone. This provides direct observational support for the theory that fracture zones dam lateral flow along ridges.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 21:13:36