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Titolo:
Implications of slab mineralogy for subduction dynamics
Autore:
Bina, CR; Stein, S; Marton, FC; Van Ark, EM;
Indirizzi:
Northwestern Univ, Dept Geol Sci, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 Geol Sci, Evanston, IL 60208 USA
Titolo Testata:
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
fascicolo: 1-4, volume: 127, anno: 2001,
pagine: 51 - 66
SICI:
0031-9201(200112)127:1-4<51:IOSMFS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEEP-FOCUS EARTHQUAKES; OLIVINE-SPINEL TRANSFORMATION; PRESSURE-TEMPERATURE SLOPES; MANTLE TRANSITION ZONE; IZU-BONIN SLAB; P-WAVE SPEEDS; PHASE-TRANSFORMATIONS; SEISMIC DISCONTINUITIES; SYSTEM MG2SIO4-FE2SIO4; OCEANIC LITHOSPHERE;
Keywords:
slab mineralogy; subduction; morphology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
122
Recensione:
Indirizzi per estratti:
Indirizzo: Bina, CR Northwestern Univ, Dept Geol Sci, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 , Evanston, IL 60208 USA
Citazione:
C.R. Bina et al., "Implications of slab mineralogy for subduction dynamics", PHYS E PLAN, 127(1-4), 2001, pp. 51-66

Abstract

Phase relations among mantle minerals are perturbed by the thermal environment of subducting slabs, both under equilibrium and disequilibrium (metastable) conditions. Such perturbations yield anomalies not only in seismic velocities but also in density. The buoyancy forces arising from these density anomalies may exert several important effects. They contribute to the stress field within the slab, in a fashion consistent with observed patterns of seismicity. They may affect subduction rates, both by inducing time-dependent velocity changes under equilibrium conditions and by imposing velocitylimits through a thermal feedback loop under disequilibrium conditions. They may affect slab morphology, possibly inhibiting penetration of slabs into the lower mantle and allowing temporary stagnation of deflected or detached slabs. Latent heat release from phase transitions under disequilibrium conditions in slabs can yield isobaric superheating, which may generate adiabatic shear instabilities capable of triggering deep seismicity. (C) 2001 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 04/08/20 alle ore 22:57:35