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Titre du document / Document title

Rheological properties of basaltic lavas at sub-liquidus temperatures: laboratory and field measurements on lavas from Mount Etna

Auteur(s) / Author(s)

PINKERTON H. (1) ; NORTON G. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Environmental Science Division, Lancaster University, Lancaster LA1 4YQ, ROYAUME-UNI
(2) British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, ROYAUME-UNI

Résumé / Abstract

Copyright (c) 1996 Elsevier Science B.V. All rights reserved. Models of many magmatic processes require accurate data on the rheological properties of lava at sub−liquidus temperatures. Laboratory measurements of the rheological properties of basalts erupted on Mount Etna in 1983 were made at various crystal concentrations in a specially designed furnace using a Haake Rotovisco viscometer attached to a spindle designed to eliminate slippage at the melt−spindle interface. Measurements were made at strain rates between 0.3 and 5 s−1 over the range of eruption temperatures on Mount Etna (1084−1125°C). At temperatures above 1120°C, the 1983 lava behaves as a Newtonian fluid. At lower temperatures, the lava is a thixotropic, pseudoplastic fluid with a maximum yield strength of 78 Pa at a temperature of 1087°C. In view of its low yield strength over this temperature range, the rheological behaviour of the lava approximates to that of a power law fluid. Apparent viscosities at unit shear strain rates increase from 150 Pa s at 1125°C to 3000 Pa s at 1084°C. Unit strain rate apparent viscosities measured in the field using a rotating vane viscometer range from 1385 Pa s to 1630 Pa s. These values are in close agreement with those measured at the same temperature in the laboratory and with those calculated theoretically from the physico-chemical properties of the lava.

Revue / Journal Title

Journal of volcanology and geothermal research    ISSN  0377-0273   CODEN JVGRDQ 

Source / Source

1995, vol. 68, no4, pp. 307-323

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Oxford, ROYAUME-UNI  (1976) (Revue)

Mots-clés anglais / English Keywords

Sicily

;

Mount Etna

;

basalts

;

magmas

;

laboratory studies

;

in situ

;

rheology

;

temperature

;

liquidus

;

lava

;

melting

;

models

;

viscosity

;

fluid dynamics

;

Italy

;

Europe

;

volcanic rocks

;

igneous rocks

;

Mots-clés français / French Keywords

Sicile

;

Volcan Etna

;

Basalte

;

Magma

;

Essai laboratoire

;

Essai in situ

;

Rhéologie

;

Température

;

Liquidus

;

Lave

;

Fusion

;

Modèle

;

Viscosité

;

Dynamique fluide

;

Italie

;

Europe

;

Roche volcanique

;

Roche ignée

;

Mots-clés espagnols / Spanish Keywords

Sicilia

;

Etna

;

Basalto

;

Magma

;

Ensayo laboratorio

;

Ensayo in situ

;

Reología

;

Temperatura

;

Lava

;

Fusión

;

Modelo

;

Viscosidad

;

Dinámica fluido

;

Italia

;

Europa

;

Roca volcánica

;

Roca ignea

;

Localisation / Location

INIST-CNRS, Cote INIST : 17236

Nº notice refdoc (ud4) : 5970696



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