Quartz c-axis evidence for deformation characteristics in the Sanandaj–Sirjan metamorphic belt, Iran

Samani, Babak

doi:10.1016/j.jafrearsci.2013.01.006

Cited by 16 publications

(2 citation statements)

References 43 publications

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“…Note that these R xz values were calculated from the shape of plastically deformed elongate, slightly recrystallized quartz grains lying in the plane of the main foliation while analyses of shape data were performed using algebraic and geometric R f /Φ methods (e.g. Xypolias, Chatzaras & Koukouvelas, 2007; Xypolias, 2009; Samani, 2013). R f /Φ diagrams were constructed using the software of Chew (2003).…”

Section: Kinematic Vorticity Analysismentioning

confidence: 99%

Kinematic analysis of rock flow and deformation temperature of the Sirjan thrust sheet, Zagros Orogen, Iran

et al. 2016

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Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order to investigate kinematics of rock flow and deformation temperature in the Sirjan thrust sheet exposed in a structural window within the Sanandaj–Sirjan High Pressure – Low Temperature (HP–LT) metamorphic belt that forms part of the hinterland of the Zagros orogenic belt of Iran. A dominant top-to-the-SW sense of shear in the study area is indicated by several shear sense indicators such as asymmetric boudins, rotated porphyroclasts, mica fish and S/C fabrics. Quantitative analyses reveal approximately plane strain deformation conditions with Rxz values ranging from 2.5 to 4.3 and increasing towards the Sirjan thrust. Opening angles of quartz c-axis fabrics and recrystallization regimes suggest deformation temperatures vary from 430 to 625 ± 50°C in the hanging wall rocks. Oblique grain shape and quartz c-axis fabrics were used to estimate the degree of non-coaxiality during deformation. The obtained vorticity profile indicates a down-section increase in kinematic vorticity number (Wm) from 0.6 to 0.89. This range of vorticity numbers confirms contributions of both simple (41–68 %) and pure shear (32–59 %) deformation components. The structural characteristics of the study area ultimately were controlled by oblique motion of the Afro-Arabian plate relative to the Iranian plate.

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Section: Kinematic Vorticity Analysismentioning

confidence: 99%

Kinematic analysis of rock flow and deformation temperature of the Sirjan thrust sheet, Zagros Orogen, Iran

et al. 2016

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“…Some mineral grains such as K-feldspar, quartz, garnet and amphibole in a relatively weaker matrix have received much attention for their kinematic significance. They allow determination of sense of shear or kinematic vorticity number, distinguishing different deformation events, as well as finite strain and deformation temperature (Passchier and Trouw 2005;Iacopini et al 2008;Hamimi et al 2014;Mukherjee 2011Mukherjee , 2013Mukherjee , 2014Mukherjee , 2015Samani 2013;Faghih and Soleimani 2015).…”

Section: Introductionmentioning

confidence: 99%

Kinematics of the Sirjan mylonite nappe, Zagros Orogenic Belt: insights from strain and vorticity analyses

Sarkarinejad¹,

Keshavarz²,

Faghih³

2015

J. Geosci.

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The Sirjan mylonite nappe is part of the HP-LT Sanandaj-Sirjan Metamorphic Belt (Zagros Orogenic Belt, Iran). This nappe was emplaced in a transpressional regime during oblique convergence between the Afro-Arabian Continent and Central Iranian Microcontinent. In order to investigate the type of flow, fabrics from deformed quartz and K-feldspar porphyroclasts were analyzed. Quantitative finite strain (R XZ = 1.9-3.8) and mean kinematic vorticity number (W m = 0.60-0.85) analyses revealed that both the strain ratio and the simple shear component of deformation increase towards SE along a 2 km long NW-SE-oriented transect. Analysis of quartz and K-feldspar textures suggests shearing at c. 400-650 °C. We also conclude that deformation in the Sirjan mylonite nappe began with nearly pure shear flow but became a more simple-shear flow in character as strain accelerated. : kinematics, mylonite, vorticity, strain path, deformation, Zagros Orogenic Belt Received: 29 June, 2015; accepted: 23 October, 2015; handling editor: J. Žák by various mechanisms such as gravitational gliding (requires sliding of the thrust sheet over a generally down-dipping basal slope) or gravitational spreading (horizontal spreading and vertical shortening of a pile of nappes under their own weight) (Jeffreys Keywords

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From finite to incremental strain

Vitale

Mazzoli

2015

Ductile Shear Zones

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Quartz c-axis evidence for deformation characteristics in the Sanandaj–Sirjan metamorphic belt, Iran

Cited by 16 publications

References 43 publications

Kinematic analysis of rock flow and deformation temperature of the Sirjan thrust sheet, Zagros Orogen, Iran

Kinematic analysis of rock flow and deformation temperature of the Sirjan thrust sheet, Zagros Orogen, Iran

Kinematics of the Sirjan mylonite nappe, Zagros Orogenic Belt: insights from strain and vorticity analyses

From finite to incremental strain

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