Hornblende deformation features

Rooney, Thomas P.; Riecker, Robert E.; Gavasci, Anna T.

doi:10.1130/0091-7613(1975)3<364:hdf>2.0.co;2

Cited by 66 publications

(29 citation statements)

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“…Amphiboles are relatively resistant to crystal plastic deformation even at high metamorphic grades (Brodie & Rutter 1985). The dominant slip system (100)[001] in amphibole was inferred from both experimental and natural studies (Dollinger & Blacic 1975;Rooney et al 1975;Cumbest et al 1989b;Hacker & Christie 1990;Skrotzki 1990). The (hk0)[001] slip system was determined by Biermann & Van Roermund (1983) and Morrison-Smith (1976).…”

Section: Deformation Mechanisms Of Amphibolementioning

confidence: 99%

Contrasting microstructures and deformation mechanisms in metagabbro mylonites contemporaneously deformed under different temperatures ( c. 650 °C and c. 750 °C)

Baratoux

Schulmann

Ulrich

et al. 2005

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Deformation mechanisms of amphibole and plagioclase were investigated in two metagabbroic sheets (the eastern and western metagabbros from the Stars M~sto belt, eastern Bohemian Massif), using petrology, quantitative microstructural and electron backscattered diffraction methods. After the gabbroic pyroxene was replaced by amphibole, both gabbroic bodies became progressively deformed. The eastern metagabbros were deformed under temperature of c. 650 ~ and the western metagabbros under c. 750 ~ Subgrain rotation and dislocation creep, characterized by strong crystallographic and shape preferred orientations, operated in plagioclase of the eastern belt during the early stages of deformation. Subsequent randomizing of plagioclase crystallographic preferred orientation is interpreted to be due to grain boundary sliding in the mylonitic stage. Large (50-150 ixm) grain sizes during the mylonitic stages are interpreted to be due to low strain rates. Amphibole is stronger and deforms cataclastically, leading to important grain size reduction when the bulk rock strength drops substantially. In the western belt, plagioclase deformed by dislocation creep accompanied by grain boundary migration (possibly chemically induced) while heterogeneous nucleation and syndeformational grain growth in conjunction with dislocation creep were typical for amphiboles.

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Section: Deformation Mechanisms Of Amphibolementioning

confidence: 99%

Contrasting microstructures and deformation mechanisms in metagabbro mylonites contemporaneously deformed under different temperatures ( c. 650 °C and c. 750 °C)

Baratoux

Schulmann

Ulrich

et al. 2005

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“…[001] as a major slip system (Rooney et al 1975;Biermann and Van Roermund 1983;Cumbest et al 1989;Reynard et al 1989;Hacker and Christie 1990;Skrotzki 1990Skrotzki , 1992Kenkmann and Dresen 2002;Baratoux et al 2005). As the temperature decreases, other mechanisms such as twining, solution mass transfer, and dissolution-precipitation creep become more important (e.g., Dollinger and Blacic 1975;Biermann 1981;Imon et al 2002).…”

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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“…Textural evidence suggests also that slip was associated with recrystallisation, as recognised elsewhere for hornblende (e.g. Dollinger and Balcic, 1975;Rooney et al 1975;Reynard et al 1989, Skrotzki, 1990, Ji et al 1993). However, essentially identical CPO could be produced by rigid-body rotation of individual hornblende grains (e.g.…”

Section: Cpo Interpretationsmentioning

confidence: 92%

Application of SEM-EBSD to regional scale shear zone analysis: A case study of the Bhavani Shear Zone, South India

Prasannakumar

Lloyd

2010

J Geol Soc India

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The Bhavani Shear Zone (BSZ), part of the Palghat-Cauvery shear system of southern India, comprises a number of subparallel shear zones ranging in width from a few centimetres to tens of metres. These shear zones are characterised by progressive mylonitisation and shear fabrics corresponding to increasing strain, as documented by grain size reduction, flattening, elongation and dimensional preferred orientation of constituent minerals (quartz, hornblende, biotite, plagioclase and orthoclase). However, SEM-EBSD measured crystal preferred orientations (CPO) of these minerals are more complex and indicate interchange of maximum (X) and intermediate (Y) tectonic axes during different phases of deformation, with the minimum axis (Z) remaining approximately constant. The tectonic evolution of the BSZ and the disposition of the surrounding Archaean and Pan-African granulites are interpreted therefore in terms of polyphase deformation involving both dip-slip and strike-slip movement events in a multiply reactivated setting. SEM-EBSD CPO analysis provides clearer indication of potentially conflicting movement directions that are otherwise poorly constrained by shear markers and shear sense indicators.

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Hornblende deformation features

Cited by 66 publications

References 0 publications

Contrasting microstructures and deformation mechanisms in metagabbro mylonites contemporaneously deformed under different temperatures ( c. 650 °C and c. 750 °C)

Contrasting microstructures and deformation mechanisms in metagabbro mylonites contemporaneously deformed under different temperatures ( c. 650 °C and c. 750 °C)

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

Application of SEM-EBSD to regional scale shear zone analysis: A case study of the Bhavani Shear Zone, South India

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