1991
DOI: 10.1029/90jb02491
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Flow laws of polyphase aggregates from end‐member flow laws

Abstract: An incompressible finite element model has been used to study the plane strain deformation of two‐phase aggregates deformed by dislocation creep. Input for the model includes the power law flow laws of the two end‐member phases and their volume fractions and configuration. The model calculates the overall flow law of the aggregate as well as the stress and strain rate variations within it. The input flow laws were experimentally determined for monomineralic aggregates of clinopyroxene and plagioclase. Results … Show more

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Cited by 220 publications
(210 citation statements)
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“…For example, experimental studies on natural diabase (a fine-grained rock with gabbroic composition) demonstrate that samples with ~70 vol% plagioclase are significantly weaker than those with 56 vol% plagioclase [Mackwell et al, 1998]. The contrast in rheology of the plagioclase layers and the coarse gabbros is also consistent with the experimental study of Dimanov and Dresen [2005] and the theoretical mixing relationships reviewed by Tullis et al [1991] and Dimanov and Dresen [2005]. The effect of plagioclase content is illustrated in Figure 13a, where the diabase with 70%…”
Section: Deformation Mechanisms For Gabbro Mylonite Layers and Coarsesupporting
confidence: 73%
“…For example, experimental studies on natural diabase (a fine-grained rock with gabbroic composition) demonstrate that samples with ~70 vol% plagioclase are significantly weaker than those with 56 vol% plagioclase [Mackwell et al, 1998]. The contrast in rheology of the plagioclase layers and the coarse gabbros is also consistent with the experimental study of Dimanov and Dresen [2005] and the theoretical mixing relationships reviewed by Tullis et al [1991] and Dimanov and Dresen [2005]. The effect of plagioclase content is illustrated in Figure 13a, where the diabase with 70%…”
Section: Deformation Mechanisms For Gabbro Mylonite Layers and Coarsesupporting
confidence: 73%
“…Thus we suggest that the most realistic estimate of lower crustal rheology is between that of anorthosite and dry quartz. We thus also model the rheology of an aggregate [Tullis et al, 1991] …”
Section: Rheologymentioning
confidence: 99%
“…Their inferred power-law parameters (Table 2) indicate substantial weakening of antigorite below the brittle -ductile transition. If these parameters are included in a calculation for the partially serpentinized upper mantle using the aggregate flow laws of Tullis et al (1991), a relatively high degree of serpentinization (30-40%) is required for the transition to appear in the envelopes (i.e. greater than indicated by seismic experiments).…”
Section: Construction Of Yield Strength Envelopesmentioning
confidence: 99%