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Titolo:
Deformation of partially molten granite: a review and comparison of experimental and natural case studies
Autore:
Rosenberg, CL;
Indirizzi:
Free Univ Berlin, Fachrichtung Allgemeine Geol, D-12249 Berlin, Germany Free Univ Berlin Berlin Germany D-12249 ne Geol, D-12249 Berlin, Germany
Titolo Testata:
INTERNATIONAL JOURNAL OF EARTH SCIENCES
fascicolo: 1, volume: 90, anno: 2001,
pagine: 60 - 76
SICI:
1437-3254(200105)90:1<60:DOPMGA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
MELT TOPOLOGY; RHEOLOGICAL TRANSITIONS; FABRIC DEVELOPMENT; DISLOCATION CREEP; ROCK DEFORMATION; MANTLE ROCKS; SHEAR ZONE; MAGMA; FLOW; CRUST;
Keywords:
granite; melt; melt topology; synmagmatic deformation; experimental deformation; magmatic microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
96
Recensione:
Indirizzi per estratti:
Indirizzo: Rosenberg, CL Free Univ Berlin, Fachrichtung Allgemeine Geol, Malteserstr 74-100, D-12249 Berlin, Germany Free Univ Berlin Malteserstr 74-100 BerlinGermany D-12249
Citazione:
C.L. Rosenberg, "Deformation of partially molten granite: a review and comparison of experimental and natural case studies", INT J E SCI, 90(1), 2001, pp. 60-76

Abstract

Experimental and natural investigations of partially molten granite are compared and reviewed. Experiments suggest that deformation of partially molten granite with low-viscosity melt (10(4) Pa s) exhibits a theological critical melt percentage (RCMP). In case of high viscosity melts (10(8) Pa s), however, the relationship between melt fraction and log viscosity of the partially molten granite may be linear. Considerations about viscosity, theological thresholds, and segregation of natural melts suggest that low-viscosity melt experiments simulate natural conditions more realistically. Therefore, an RCMP is to be expected under natural conditions. Both diffusion creep and dislocation creep may occur under natural conditions, whereas cataclastic flow is only observed under experimental conditions. A melt-induced transition from dislocation creep to diffusion creep occurs under experimental and natural conditions. Melt topology is controlled by the magnitude of differential stress under experimental conditions. If differential stress is higher than similar to 100-150 MPa, melt pockets are elongate and oriented at a low angle to the maximum compressive stress. In contrast, in nature,melt pockets tend to be oriented subparallel to the foliation plane, i.e.,presumably at a high angle to the maximum compressive stress.

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Documento generato il 04/04/20 alle ore 21:39:42