Dislocation generation, slip systems, and dynamic recrystallization in experimentally deformed plagioclase single crystals

Stünitz, Holger; Gerald, John Fitz; Tullis, Jan

doi:10.1016/s0040-1951(03)00241-5

Cited by 140 publications

(96 citation statements)

References 42 publications

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“…Cells with high misorientation may act as seeds for the formation of new grains. Similar recrystallization microfabrics are described for olivine deformed in kick and cook experiments on peridotites (Druiventak et al 2012) and for feldspar by Stünitz et al, 2003. Whether old grains deformed in the kick experiment are replaced by new grains, or their internal structure resulting from inhomogeneous deformation evolves into SWUE by dynamic recovery, depends on strain accumulated during Fig. 9.…”

Section: Recrystallizationmentioning

confidence: 69%

“…Given this orientation, which is the same as for cracks crosscutting the entire sample, they are likewise interpreted to result from unloading (e.g. Fitz Gerald et al, 1991;Stünitz et al, 2003). In contrast, these microcrack arrays are associated with domains that reveal a slight misorientation < 2 • with respect to the intact host, visible by slightly differing extinction in the polarization microscope, and confirmed by EBSD (Fig.…”

Section: Microfabricsmentioning

confidence: 79%

“…Cracks perpendicular to the cylinder axis resulting from unloading (e.g. Fitz Gerald et al, 1991;Stünitz et al, 2003) transect the entire sample and cause underestimation of total sample strain determined from the change in length of cylinder axis during the experiment. For the creep stage, approximate strain rates are estimated by dividing strain (ε tot −ε 1 ) by duration.…”

Section: Mechanical Datamentioning

confidence: 99%

“…The tensile microcracks being oriented normal to the cylinder axis, i.e. normal to the maximum principal stress during the kick experiment, indicate that brittle failure occurred during unloading (Fitz Gerald et al, 1991;Stünitz et al, 2003). Nucleation of cracks is expected to be facilitated in regions that previously underwent strain hardening by pile-up of dislocations.…”

Section: Low-temperature Plasticitymentioning

confidence: 99%

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Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust – an experimental study

Trepmann

Stöckhert

2013

Solid Earth

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Abstract. Deformation experiments are carried out on natural vein quartz in a modified Griggs-type solid medium apparatus to explore the preservation potential of microfabrics created by crystal-plastic deformation at high stress, overprinted during subsequent creep at lower stress. A corresponding stress history is expected for the upper plastosphere, where fault slip during an earthquake causes quasiinstantaneous loading to high stress, followed by stress relaxation. The question is whether evidence of crystal-plastic deformation at high stress, hence an indicator of past seismic activity, can still be identified in the microstructure after overprint by creep at lower stresses. First, quartz samples are deformed at a temperature of 400 • C and constant strain rate of 10 −4 s −1 ("kick"), and then held at 900 to 1000 • C at residual stress ("creep"). In quartz exclusively subject to high-stress deformation, lamellar domains of slightly differing crystallographic orientation (misorientation angle < 2 • ) and a few tens of micrometres wide occur. In the transmission electron microscope (TEM), these areas show a high density of tangled dislocations and cellular structures. After "kick and creep" experiments, pronounced short-wavelength undulatory extinction (SWUE) is observed in the polarization microscope. The wavelength of SWUE is up to 10 µm, with oscillatory misorientation of up to a few degrees. TEM inspection reveals domains with high density of dislocations and differing diffraction contrast bound by poorly ordered dislocation walls. Only zones with exceptional damage generated during high-stress deformation are replaced by small new grains with a diameter of about 10 to 20 µm, forming strings of recrystallized grains. For large original grains showing SWUE, the Schmid factor for basal a glide is found to be high. SWUE is taken to reflect high-stress crystal-plastic deformation, the modified microstructure being sufficiently stable to be recognized after subsequent creep as an indicator of past seismic activity.

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Section: Recrystallizationmentioning

confidence: 69%

Section: Microfabricsmentioning

confidence: 79%

Section: Mechanical Datamentioning

confidence: 99%

Section: Low-temperature Plasticitymentioning

confidence: 99%

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Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust – an experimental study

Trepmann

Stöckhert

2013

Solid Earth

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“…High-temperature experiments, studies of preferred orientations in naturally deformed high-grade rocks, and simulations all suggest that plagioclase dominantly deforms by dislocation glide on (010) [001] accompanied by (010)[100] slip (Lafrance et al 1998;Ji et al 2000Ji et al , 2004Stü nitz et al 2003;Gó mez Barreiro et al 2007a;Harigane et al 2008). Slip on (001)[100] has been also identified in naturally deformed rocks at medium-to high-grade conditions (Kruhl 1987;Siegesmund et al 1994;Terry and Heidelbach 2006;Harigane et al 2008).…”

Section: Origin and Meaning Of Textures And Microstruc-mentioning

confidence: 99%

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Barreiro

Catalán²,

Prior³

et al. 2010

The Journal of Geology

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Semibrittle deformation and partial melting of perthitic K‐feldspar: An experimental study

et al. 2014

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To investigate the relationships between deformation, cracking, and partial melting in the lower continental crust, axial compression and hydrostatic experiments were performed on K-feldspar single crystals at temperatures of 700°and 900°C and confining pressures between 0.75 and 1.5 GPa. Sample deformation was carried out at a constant strain rate of~10 À6 s À1 . The samples deformed at 700°C show typical brittle behavior with formation of conjugate fractures and peak stresses that increase with confining pressure. Samples deformed at 900°C show formation of shear fractures, peak stresses below the Goetze criterion, and inverse confining pressure dependence of peak stress, indicating that along the fractures deformation was not dominantly friction controlled. Microstructural and chemical analyses reveal the presence of melt (<6 vol %) of inhomogeneous composition along the shear zones and chemical compositional changes of gouge fragments. In a hydrostatic experiment performed at 900°C, no melt and no compositional changes were observed. These observations indicate that deformation of K-feldspars at high pressures and temperatures is controlled by the simultaneous formation of brittle fractures and melt. The formation of melt is strongly accelerated and kinetically favored by cracking, as demonstrated by the absence of melting in the hydrostatic experiments. However, the melt along fractures does not dramatically weaken the samples, as the melt domains remain isolated during deformation. The fine-grained gouge fragments formed along the fracture systems undergo chemical homogenization. The dominant deformation mechanism in the gouge is likely to be melt-enhanced diffusion creep, which may also assist the chemical homogenization process.

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Dislocation generation, slip systems, and dynamic recrystallization in experimentally deformed plagioclase single crystals

Cited by 140 publications

References 42 publications

Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust – an experimental study

Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust – an experimental study

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Semibrittle deformation and partial melting of perthitic K‐feldspar: An experimental study

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