Crystal–plastic deformation and recrystallization of peridotite controlled by the seismic cycle

Matysiak, Agnes; Trepmann, Claudia A.

doi:10.1016/j.tecto.2011.11.029

Cited by 48 publications

(53 citation statements)

References 49 publications

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“…However, the chemical variance of recrystallized grains and host porphyroclasts observed here is in contrast to the remarkably homogeneous chemical composition of the localized recrystallized grains and porphyroclasts in peridotites from the Ivrea zone (e.g. Matysiak and Trepmann, 2012). Applying the experimental calibrations of the dependence of recrystallization grain size of olivine developed in the regime of dislocation creep on flow stress by van der Wal et al (1993) and Karato (1980) to the observed recrystallized grain sizes of 10 to 50 µm, one derives differential stresses in the range of 70 to 250 MPa and 76 to 300 MPa, respectively.…”

Section: Deformation Processes and Conditions Recorded By Olivine Andcontrasting

confidence: 87%

“…Intragranular zones of recrystallized grains within deformed porphyroclasts are indicators for a switch from an initial brittle and glide-controlled deformation in the lowplasticity regime followed by dislocation creep. Such a microstructural development is characteristic for stress variations at the lower tip of seismically active fault zones Trepmann et al, 2007;Druiventak et al, 2012;Matysiak and Trepmann, 2012). However, the chemical variance of recrystallized grains and host porphyroclasts observed here is in contrast to the remarkably homogeneous chemical composition of the localized recrystallized grains and porphyroclasts in peridotites from the Ivrea zone (e.g.…”

Section: Deformation Processes and Conditions Recorded By Olivine Andmentioning

confidence: 59%

“…Albaric et al, 2009;Ibs-von Seht et al, 2008). At deep continuations of seismically active fault zones peridotites can be affected by a sequence of high-stress deformation followed by recrystallization at decreasing stresses (Druiventak et al, 2011(Druiventak et al, , 2012Matysiak and Trepmann, 2012), leading to strongly heterogeneous microstructures with localized zones of fine-grained recrystallized aggregates with weak CPO within and surrounding deformed porphyroclasts. The partly recrystallized and crystal-plastically deformed olivine porphyroclasts and Fig.…”

Section: From Brittle and Crystal-plastic Deformation To Dissolution-mentioning

confidence: 99%

“…Hilairet et al, 2007;Chernak and Hirth, 2010) microfabrics can yield information on the deformation mechanisms, as well as the stress and strain-rate conditions during burial and exhumation (e.g. Skrotzki et al, 1990;van der Wal, 1993;Altenberger, 1995;Jin et al 1998;Zhang et al, 2000;Jung and Karato, 2001;Piepenbreier and Stöckhert, 2001;Stöckhert, 2002;Andreani et al, 2005;Auzende et al, 2006;Jung et al, 2006;Wassmann et al, 2011;Matysiak and Trepmann, 2012). The aim of this study is to use the successively overprinted and modified microfabrics of the partly serpentinized peridotite mylonites to differentiate between the potential record of independent grain-scale deformation processes and implications on the stress conditions.…”

Section: Introductionmentioning

confidence: 99%

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The microstructural record of porphyroclasts and matrix of partly serpentinized peridotite mylonites – from brittle and crystal-plastic deformation to dissolution–precipitation creep

Bial

Trepmann

2013

Solid Earth

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Abstract. We present microfabrics in high-pressure, metamorphic, partly serpentinized peridotite mylonites from the Voltri Massif, in which porphyroclasts and matrix record independent deformation events. The microfabrics are analysed using polarization microscopy and electron microscopy (SEM/EBSD, EMP). The mylonites contain diopside and olivine porphyroclasts originating from the mantle protolith embedded in a fine-grained matrix consisting mainly of antigorite and minor olivine and pyroxene. The porphyroclasts record brittle and crystal-plastic deformation of the peridotite at upper-mantle conditions and differential stresses of a few hundred MPa. After the peridotites became serpentinized, deformation occurred mainly by dissolutionprecipitation creep resulting in a pronounced foliation of the antigorite matrix, crenulation cleavages and newly precipitated olivine and pyroxene from the pore fluid at sites of dilation, i.e. in strain shadows next to porphyroclasts and folded fine-grained antigorite layers. Antigorite reveals a pronounced associated shape preferred orientation (SPO) and crystallographic preferred orientation (CPO) with the basal (001) cleavage plane oriented in the foliation plane. In monomineralic antigorite aggregates at sites of stress concentration around porphyroclasts, a characteristically reduced grain size and deflecting CPO as well as sutured grain boundaries indicate also some contribution of crystal-plastic deformation and grain-boundary migration of antigorite. In contrast, the absence of any intragranular deformation features in newly precipitated olivine in strain shadows reveals that stresses were not sufficiently high to allow for significant dislocation creep of olivine at conditions at which antigorite is stable. The porphyroclast microstructures are not associated with the microstructures of the mylonitic matrix, but are inherited from an independent earlier deformation. The porphyroclasts record a high-stress deformation of the peridotite with dislocation creep of olivine in the upper mantle probably related to rifting processes, whereas the serpentinite matrix records dominantly dissolution-precipitation creep and low stresses during subduction and exhumation.

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Section: Deformation Processes and Conditions Recorded By Olivine Andcontrasting

confidence: 87%

Section: Deformation Processes and Conditions Recorded By Olivine Andmentioning

confidence: 59%

Section: From Brittle and Crystal-plastic Deformation To Dissolution-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The microstructural record of porphyroclasts and matrix of partly serpentinized peridotite mylonites – from brittle and crystal-plastic deformation to dissolution–precipitation creep

Bial

Trepmann

2013

Solid Earth

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“…However, this discussion would remain open as the seismic layer may extend to greater depths than the brittle-ductile boundary (Scholz, 1998;Handy and Brun, 2004;Zang et al, 2007;Fernández-Ibáñez and Soto 2008;Chen et al, 2012). The cause of seismicity at ductile crustal levels is not well understood, and it has been explained by: high pore-fluid pressures that widens the brittle layer (Boncio, 2008;Brantut et al, 2011;Hirono and Tanikawa, 2011), increased strain rate in the co-seismic and early post-seismic phases (aftershocks) that would extend the brittle-ductile transition in depth (Boncio 2008;Chen et al, 2012), or alternative constitutive relationships such as brittle fracture mechanism (Zang et al, 2007), dislocation glide (Matysiak and Trepmann, 2012;White 2012), or mixed brittle-viscous region between the brittle upper crust and viscous lower crust where faults are able to penetrate (Scholz, 1998;Dempsey et al, 2012). On the other hand, there is a margin of error in the estimation of earthquake depths.…”

Section: Seismicitymentioning

confidence: 99%

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Martín-Velázquez

Muñoz

Gómez-Ortíz

et al. 2016

Journal of Iberian Geology

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Previous studies about the strength of the lithosphere in the center of Iberia fail to resolve the depth of earthquakes because of the rheological uncertainties. Therefore, new contributions are considered (the crustal structure from a density model) and several parameters (tectonic regime, mantle rheology, strain rate) are checked in this paper to properly examine the role of lithospheric strength in the intraplate seismicity and the Cenozoic evolution. The strength distribution with depth, the integrated strength, the effective elastic thickness and the seismogenic thickness have been calculated by a finite element modelling of the lithosphere across the Central System mountain range and the bordering Duero and Madrid sedimentary basins. Only a dry mantle under strike-slip/extension and a strain rate of 10 -15 s , causes a strong lithosphere. The integrated strength and the elastic thickness are lower in the mountain chain than in the basins. This heterogeneity has been maintained since the Cenozoic and determine the mountain uplift and the biharmonic folding of the Iberian lithosphere during the Alpine deformations. The seismogenic thickness bounds the seismic activity in the upper-middle crust, and the decreasing crustal strength from the Duero Basin towards the Madrid Basin is related to a parallel increase in Plio-Quaternary deformations and seismicity. However, elasto-plastic modelling shows that current African-Eurasian convergence is resolved elastically or ductilely, which accounts for the low seismicity recorded in this region.Keywords: lithospheric strength, effective elastic thickness, seismogenic thickness, Iberia, finite element modelling ResumenLos estudios previos sobre resistencia de la litosfera en el centro de Iberia no logran resolver la profundidad de los terremotos debido a las incertidumbres reológicas. Por eso, en este trabajo se han considerado nuevas contribuciones (estructura cortical obtenida de un modelo de densidad) y se han comprobado varios parámetros (régimen tectónico, reología del manto, tasa de deformación) para examinar adecuadamente el papel de la resistencia de la litosfera en la sismicidad intraplaca y en la evolución Cenozoica. Mediante una modelización de elementos finitos, se ha calculado la distribución de la resistencia con la profundidad, la resistencia integrada, el espesor elástico efectivo y el espesor sismogénico en una sección litosférica que atraviesa la cadena montañosa del Sistema Central y las cuencas sedimentarias del Duero y Madrid. Sólo un manto seco en desgarre/extensión y una tasa de deformación de 10 -15 s -1, o bajo extensión y 10 -16 s -1 , origina una litosfera resistente. La resistencia integrada y el espesor elástico son más bajos en el sistema montañoso que en las cuencas. Estas anisotropías se han mantenido desde el Cenozoico y determinan el levantamiento de la cadena y el plegamiento biarmónico de la litosfera Ibérica durante las deformaciones alpinas. El espesor sismogénico limita la actividad sísmica en la corteza superior-media, y l...

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The deformation record of olivine in mylonitic peridotites from the Finero Complex, Ivrea Zone: Separate deformation cycles during exhumation

Matysiak

Trepmann

2015

Tectonics

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Mylonitic peridotites from the Finero complex are investigated to detect characteristic olivine microfabrics that can resolve separate deformation cycles at different metamorphic conditions. The heterogeneous olivine microstructures are characterized by deformed porphyroclasts surrounded by varying amounts of recrystallized grains. A well-developed but only locally preserved foam structure is present in recrystallized grain aggregates. This indicates an early stage of dynamic recrystallization and subsequent recovery and recrystallization at quasi-static stress conditions, where the strain energy was reduced such that a reduction in surface energy controlled grain boundary migration. Ultramylonites record a renewed stage of localized deformation and recrystallization by a second generation of recrystallized grains that do not show a foam structure. This second generation of recrystallized grains as well as sutured grain and kink band boundaries of porphyroclasts indicate that these microstructures developed during a stage of localized deformation after development of the foam structure. The heterogeneity of the microfabrics is interpreted to represent several (at least two) cycles of localized deformation separated by a marked hiatus with quasi-static recrystallization and recovery and eventually grain growth. The second deformation cycle did not only result in reactivation of preexisting shear zones but instead also locally affected the host rock that was not deformed in the first stage. Such stress cycles can result from sudden increases in differential stress imposed by seismic events, i.e., high stress-loading rates, during exhumation of the Finero complex.

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Crystal–plastic deformation and recrystallization of peridotite controlled by the seismic cycle

Cited by 48 publications

References 49 publications

The microstructural record of porphyroclasts and matrix of partly serpentinized peridotite mylonites – from brittle and crystal-plastic deformation to dissolution–precipitation creep

The microstructural record of porphyroclasts and matrix of partly serpentinized peridotite mylonites – from brittle and crystal-plastic deformation to dissolution–precipitation creep

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

The deformation record of olivine in mylonitic peridotites from the Finero Complex, Ivrea Zone: Separate deformation cycles during exhumation

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