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Titolo:
Existence of complex spatial zonation in the Galapagos plume for at least 14 m.y.
Autore:
Hoernle, K; Werner, R; Morgan, JP; Garbe-Schonberg, D; Bryce, J; Mrazek, J;
Indirizzi:
GEOMAR, D-24148 Kiel, Germany GEOMAR Kiel Germany D-24148GEOMAR, D-24148 Kiel, Germany Univ Kiel, Inst Geosci, D-24148 Kiel, Germany Univ Kiel Kiel Germany D-24148 Kiel, Inst Geosci, D-24148 Kiel, Germany Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara Santa Barbara CA USA 93106 Barbara, CA 93106 USA Univ Greifswald, D-17489 Greifswald, Germany Univ Greifswald Greifswald Germany D-17489 , D-17489 Greifswald, Germany
Titolo Testata:
GEOLOGY
fascicolo: 5, volume: 28, anno: 2000,
pagine: 435 - 438
SICI:
0091-7613(200005)28:5<435:EOCSZI>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPREADING CENTER SYSTEM; MANTLE PLUME; HOTSPOT; ARCHIPELAGO; ISLANDS; ELEMENT;
Keywords:
Galapagos; hotspot tracks; plume; Cocos Ridge; spatial chemical zonation; major element; trace element; isotope geochemistry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Hoernle, K GEOMAR, Wischhofstr 1-3, D-24148 Kiel, Germany GEOMAR Wischhofstr 1-3 Kiel Germany D-24148 4148 Kiel, Germany
Citazione:
K. Hoernle et al., "Existence of complex spatial zonation in the Galapagos plume for at least 14 m.y.", GEOLOGY, 28(5), 2000, pp. 435-438

Abstract

Basalts from intraplate or hotspot ocean islands (e.g., the Hawaiian, Galapagos, and Canary Islands) are believed to be formed by mantle plumes, which emanate from mantle boundary Layers such as the core-mantle boundary. Thelong-term chemical structure of mantle plumes, however, remains poorly constrained. Spatial variation in the chemical composition has long been recognized in lavas from the Galapagos Islands: Enriched plume material forms a horseshoe-shaped region with depleted mantle, similar in composition to mid-ocean ridge basalt, in its inner part. The enriched horseshoe-shaped region can be subdivided into three distinct geochemical domains. We show that these same domains occur in the same relative positions with respect to morphology in a geochemical profile across the Galapagos hotspot track off the coast of Costa Rica, indicating that the asymmetrical spatial zonation of the Galapagos hotspot has existed for at least 14 m.y. Combined with published He isotope data, the results of this study imply that plume material canascend from the lower mantle, possibly from the core-mantle boundary, withlittle stirring occurring during ascent, and that zonation in hotspot Lavas may in some cases reflect spatial heterogeneity within the lower mantle source.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 06:22:35