Is Iceland underlain by a plume in the lower mantle? Seismology and helium isotopes
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چکیده
منابع مشابه
Mantle flow, melting, and dehydration of the Iceland mantle plume
Recent studies have shown that the extraction of water from the mantle due to partial melting beneath mid-ocean ridges may increase the viscosity of the residuum by 2–3 orders of magnitude. We examine this rheological effect on mantle flow and melting of a ridge-centered mantle plume using three-dimensional numerical models. Results indicate that the viscosity increase associated with dehydrati...
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Outgassing of helium and argon and the isotope ratio distribution of helium isotopes in basalts are some of the most important geochemical constraints on mantle structure and evolution, but their interpretation in terms of mantle processes is ambiguous and controversial. Here, the evolution of these isotopes and their radiogenic parent isotopes of U, Th and K are studied using a numerical model...
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15 صفحه اولThe elusive mantle plume
Mantle plumes are hypothetical hot, narrow mantle upwellings that are often invoked to explain hotspot volcanism with unusual geophysical and geochemical characteristics. The mantle plume is a well-established geological structure in computer modeling and laboratory experiments but an undisputed seismic detection of one has yet to be made. Vertically continuous low shear velocity anomalies in t...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2001
ISSN: 0956-540X,1365-246X
DOI: 10.1046/j.0956-540x.2001.01457.x