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Constraining melt concentration and strain distribution around basalt dykes in partially molten olivines

By
S. Vinciguerra
S. Vinciguerra
1
HP-HT Laboratory, Istituto Nazionale di Geofisica e Vulcanologia
,
sezione di Roma1 - Via di Vigna Murata 605, 00143, Rome
,
Italy
(e-mail: vinciguerra@ingv.it)
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X. Xiao
X. Xiao
2
Department of Earth Atmospheric and Planetary Sciences
,
Massachusetts Institute of Technology
,
77 Massachusetts Avenue, Cambridge, MA 02139
,
USA
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B. Evans
B. Evans
2
Department of Earth Atmospheric and Planetary Sciences
,
Massachusetts Institute of Technology
,
77 Massachusetts Avenue, Cambridge, MA 02139
,
USA
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Published:
January 01, 2008

Abstract

Experiments were performed to determine melt concentration and strain distributions around basalt dykes in a San Carlos olivine matrix containing 10 wt% MORB (mid-ocean ridge basalt). Undrained triaxial compression tests were conducted at 1473 K and a confining pressure of 300 MPa, at constant stresses (80–160 MPa) and constant strain rates ranging from 5×10−5 to 3×10−4 s−1. Melt distribution in the dyke–matrix interface was determined by image analysis and chemical profiles. Melt migration appears to be enhanced by porosity of the microstructure and by the loading conditions. The presence of the dyke does not influence the bulk strength of the sample. Highest melt concentrations, and, presumably, the highest stress concentrations, are found at the tip of the dyke. The matrix deformation appears to be controlled by granular flow, but dilatancy occurs near the tip of the dyke, indicating coupled MORB transport and granular flow.

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Contents

Geological Society, London, Special Publications

Structure and Emplacement of High-Level Magmatic Systems

K. Thomson
K. Thomson
University of Birmingham, UK
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N. Petford
N. Petford
Bournemouth University, UK
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Geological Society of London
Volume
302
ISBN electronic:
9781862395503
Publication date:
January 01, 2008

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