Prism‐ and basal‐plane parallel subgrain boundaries in quartz: a microstructural geothermobarometer

Kruhl, Jörn H.

doi:10.1046/j.1525-1314.1996.00413.x

Cited by 462 publications

(394 citation statements)

References 6 publications

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“…7), highly lobate grain boundaries and 'chessboard extinction' of quartz grains within the shear bands are indicative of dynamic microstructures associated with temperatures around 500-700 ºC (Passchier & Trouw, 2005;Stipp et al, 2002;Kruhl, 1996;Mainprice et al, 1986). In the rocks outside the shear bands, dynamic recrystallisation structures are less common but the recorded evidence of SGR and GBM recrystallisation processes indicate temperatures in the range of 500-700 ºC (Jessell, 1987;Stipp et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

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Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

Torvela¹,

Ehlers²

2010

Bull Geol Soc Finland

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This petrographic study of rock samples from the area of a large-scale shear zone, the Sottung-Jurmo shear zone, in SW Finland, illuminates the thermal development of and strain distribution within the rocks during the last development stages of the shear zone. The results indicate relatively high temperatures during the deformation phases that created the gneisses and the mylonites, strain partitioning through time and continued transpression from S-SW until at least c. 1.79 Ga. This has implications to the latest tectonic models since the results together with previous studies suggest a compartmentalisation of regional stresses between the area SW of the shear zone and central Fennoscandia. The results also suggest that the uplift rate increased during the late stage of the transpression.

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Section: Discussionmentioning

confidence: 99%

“…The rocks within the shear bands show dynamic microstructures such as highly lobate grain boundaries and 'chessboard extinction' of quartz grains (GBM and high-T SGR processes, Figs. 7b, c, respectively; Passchier & Trouw, 2005;Stipp et al, 2002;Kruhl, 1996;Mainprice et al, 1986).…”

Section: Gneissesmentioning

confidence: 99%

Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

Torvela¹,

Ehlers²

2010

Bull Geol Soc Finland

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“…Field relations also suggest the presence of granitic melts during hightemperature, solid-state ductile strain (N.M. Dehler, unpublished data). Sillimanite and feldspar dynamic recrystallization, plus intense grain boundary migration features and " chess-board" extinction pattern in quartz (Kruhl 1996), all suggest deformation at high-temperature conditions (Passchier and Trouw 1996).…”

Section: Kinematics and Geometry Of The Earlier Structuresmentioning

confidence: 98%

Kinematics and geometry of structures in the southern limb of the Paraíba do Sul divergent structural fan, SE Brazil: a true transtensional shear

Dehler

Machado

Dehler

et al. 2006

An. Acad. Bras. Ciênc.

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Shear zones geometry in the Paraíba do Sul belt, southeastern Brazil, delineates a NE-trending fan-like structure. Shear zones dip towards SE in the northern limb, and towards NW in the southern one. This geometry has been interpreted either due to transpression or to late folding of flat-lying thrust surfaces. Stretching lineation plunges to ENE-ESE in the northern limb and towards NNE-NE in the southern one. Structural data in the southern limb of the divergent fan suggest a two stage kinematic evolution in high-temperature conditions: an earlier stage with top-to-SSW/SW sinistral thrusting and orogenic-parallel tangential motion, and a later stage with top-down to NNE/NE transtensional deformation. We propose a heterogeneous deformation model to explain the observed shear reversal, and suggest that the imposed transpressional displacement gradient may change during progressive deformation due to transient rheological inhomogeneities in bulk pure shear strain. In the earlier stage, the partially molten material could easily accommodate the imposed strain rates, giving rise fi rstly to the SW-directed shearing. As the thermal disturbance tended to vanish and the convergence increased, the NNE-directed transtensional shearing developed. We propose that the transtensional deformation characterized in this paper could be related to extrusion processes during regional transpressional strain.

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“…However, there are indications of high temperature solid-state deformation, such as occasional, blocky (checkerboard, Pawley and (Fig. 8a), suggesting T [ 650°C (Kruhl 1996) and, also, lobate grain boundaries (Fig. 8b), indicative of recrystallization at 500-700°C (Passschier and Trouw 2005).…”

Section: Synmagmatic Deformation Structuresmentioning

confidence: 99%

Sequential granite emplacement: a structural study of the late Variscan Strzelin intrusion, SW Poland

Oberc-Dziedzic

Kryza

et al. 2013

Int J Earth Sci (Geol Rundsch)

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The Strzelin Massif in SW Poland (Central European Variscides) records a protracted igneous evolution, with three main magmatic stages: (1) tonalitic I, (2) granodioritic and (3) tonalitic II/granitic. In the northern part of this Massif, the Strzelin intrusion proper comprises three successively emplaced rock types: a medium-grained biotite granite (303 ± 2 Ma), a fine-grained biotite granite (283 ± 8 Ma) and a fine-grained biotite-muscovite granite; based on field evidence, the third variety postdates both types of the biotite granites. The structural data from the three granites, including their parallel, approximately E-W striking and steeply dipping lithological contacts and ENE-WSW trending subhorizontal magmatic lineations, suggest that the emplacement of all three successive granite varieties was controlled by an active, long-lived strike-slip fault, striking ESE-WNW, with a dextral sense of movement. After the emplacement of the youngest biotitemuscovite granite, the intrusion underwent brittle extension which produced ''Q joints'' striking NNW-SSE to N-S and dipping at 55-70°WSW to W, and showing evidence of broadly N-S directed sinistral displacements. The structural observations, supported by new geochronological data, indicate that the internal structure of the composite granitoid intrusion, including the faint magmatic foliation and lineation, formed in a long-lived strike-slip setting, different from the subsequent, post-emplacement extensional tectonics that controlled the development of brittle structures.

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Prism‐ and basal‐plane parallel subgrain boundaries in quartz: a microstructural geothermobarometer

Cited by 462 publications

References 6 publications

Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

Kinematics and geometry of structures in the southern limb of the Paraíba do Sul divergent structural fan, SE Brazil: a true transtensional shear

Sequential granite emplacement: a structural study of the late Variscan Strzelin intrusion, SW Poland

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