Thermal-rheologic evolution of the upper mantle and the development of the San Andreas fault system

Furlong, Kevin P.

doi:10.1016/0040-1951(93)90162-d

Cited by 49 publications

(37 citation statements)

References 22 publications

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“…1). On this basis, it has been proposed that grain size reduction by dynamic recrystallization can bring about a switch from grain size insensitive (GSI) dislocation creep to grain size sensitive (GSS) diffusion creep (Schmid 1982;Rutter and Brodie 1988;Furlong 1993;Busch and Van der Pluijm 1995;Vissers et al 1995). These two mechanisms act as parallel-concurrent processes, hence the fastest controls creep (Poirier 1985).…”

Section: Introductionmentioning

confidence: 98%

“…Associated with this reduction in grain size, a general rheological weakening is inferred (Poirier 1980;Hobbs et al 1990). Meaningful modeling of deformation behavior of rocks must therefore include the rheological changes linked with grain refinement and localization, as emphasized in work by, amongst others, Furlong (1993), Govers and Wortel (1995) and Braun et al (1999).…”

Section: Introductionmentioning

confidence: 99%

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Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

2000

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It is widely believed that grain size reduction by dynamic recrystallization can lead to major rheological weakening and associated strain localization by bringing about a switch from grain size insensitive dislocation creep to grain size sensitive diffusion creep. Recently, however, we advanced the hypothesis that, rather than a switch, dynamic recrystallization leads to a balance between grain size reduction and grain growth processes set up in the neighborhood of the boundary between the dislocation creep field and the diffusion creep field. In this paper, we compare the predictions implied by our hypothesis with those of other models for dynamic recrystallization. We also evaluate the full range of models against experimental data on a variety of materials. We conclude that a temperature dependence of the relationship between recrystallized grain size and flow stress cannot be neglected a priori. This should be taken into account when estimating natural flow stresses using experimentally calibrated recrystallized grain size piezometers. We also demonstrate experimental support for the field boundary hypothesis. This support implies that significant weakening by grain size reduction in localized shear zones is possible only if caused by a process other than dynamic recrystallization (such as syntectonic reaction or cataclasis) or if grain growth is inhibited.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

2000

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“…This had led to the notion that grain size reduction by dynamic recrystallization can result in significant rheological weakening and shear localization effects, in both crust and mantle, by bringing about a transition from grain size insensitive (GSI) dislocation creep to grain size sensitive (GSS) diffusion creep [White et al, 1980;Rutter and Brodie, 1988;Furlong, 1993;Govers and Wortel, 1995]. Here, we argue that clear-cut transitions of this type are not possible, at least when second phases play no role, because the recrystallized grain size will tend to organize itself in the boundary between GSI and GSS creep, where GSI and GSS mechanisms contribute more or less equally to the overall creep rate.…”

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confidence: 99%

On dynamic recrystallization during solid state flow: Effects of stress and temperature

Bresser

Peach

Reijs

et al. 1998

Geophysical Research Letters

184

136

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Abstract.A hypothesis is advanced that dynamic recrystallization of Earth materials undergoing solid state flow may represent a balance between grain size reduction and grain growth processes occurring directly in the boundary between the dislocation and diffusion creep fields. Accordingly, the recrystallized grain size (D) and flow stress (o) at steady state will be related by the equation delineating the field boundary, which in general is temperature dependent. Creep experiments on a metallic rock analogue, Magnox, yielded D--101-12exp[29.3/RT]o -1-23 and demonstrated that D (•tm)decreases with increasing o (MPa) and increasing temperature (T) in a manner which is in agreement with the field botlndary hypothesis. If the model applies to rocks, the widely accepted idea that dynamic recrystallization can lead to major rheological weakening in the Earth may not hold. Moreover, empirical D-o relations, used in paleo-piezometry, will need to be modified to account for temperature effects.

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“…The base of the preexisting continent is predicted to have been subjected to temperatures above 800øC for a period of several million years [Furlong, 1984 Because of these underlying mantle conditions, the strengths of the silicic and the newly underplated mafic layers have been predicted to be very low for at least 5 Myr. This low strength has led to the suggestion that the middle or lower crust may act as a ductile detachment surface or deformation zone that horizontally connects the strike-slip faults in northern California [Furlong et al, 1989;Furlong, 1993;Brocher et al, 1994;Holbrook et al, 1996]. The seismic data contradict this prediction by indicating that the strike-slip faults penetrate near vertically through the entire crust.…”

Section: Constraints On Plate Boundary Evolutionmentioning

confidence: 42%

Wide‐angle seismic constraints on the evolution of the deep San Andreas plate boundary by Mendocino triple junction migration

Hole¹,

Beaudoin²,

Henstock³

1998

Tectonics

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Thermal-rheologic evolution of the upper mantle and the development of the San Andreas fault system

Cited by 49 publications

References 22 publications

Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

Grain size reduction by dynamic recrystallization: can it result in major rheological weakening?

On dynamic recrystallization during solid state flow: Effects of stress and temperature

Wide‐angle seismic constraints on the evolution of the deep San Andreas plate boundary by Mendocino triple junction migration

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