Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7894
AuthorsVinciguerra, S.* 
Xiao, X.* 
Evans, B.* 
TitleExperimental constraints on the mechanics of dyke emplacement in partially molten olivines
Issue Date2004
Series/Report no.234
DOI10.1144/GSL.SP.2004.234.01.16
URIhttp://hdl.handle.net/2122/7894
KeywordsDykes emplacement, Experimental constraints
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
AbstractWe investigated the mechanics of basalt dyke emplacement during laboratory deformation experiments at up to 300 MPa confining pressure and temperatures up to 1200 °C. Experiments have been conducted on two-phase samples of a basalt (MORB) dyke and a matrix of 90% San Carlos Olivine plus 10% MORB. No migration of MORB is observed when samples have been hot isostatically pressed. Conversely, significant diffusion of basalt into the matrix is found when a deviatoric stress is applied. Creep (80-160 MPa) and strain-rate experiments (from 3 x 10 -4 to 5 × 10 -5 s -1) induced melt propagation up to 50% of the initial dyke length/width ratio. The kinematics of deformation are essentially plastic and show a strong dependence on the load applied and the dyke geometry. Local pressure drops, due to dilatancy, are suspected to have enhanced melt migration.
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