Andean sinistral transpression and kinematic partitioning in South Georgia

SHEARING ZONES IN THE IZERA METAMORPHIC TERRAIN, SUDETEN (SW POLAND) Summary First structural data on the kinematics of deformations of Izera Metamorphic Terrain (IMT) in West Sudeten (SW Poland) are presented in the paper. New structural study of IMT supports the concept of existence of numerous largescale penetrative shear zones. These zones are defined by mylonitic Izera gneisses that deformed Rumburk granites to a different degree. Mylonitic are also three zones of mica schists running evenly with a parallel of latitude. Only lensoidal domains of Rumburk granites are devoid of shearing processes. Lineations in IMT are extensional (Lx) and not of Ly type (i.e. parallel to axis Y of ellipsoid of final deformation) as was previously thought. The kinematic analysis of IMT indicates a complex pattern of displacements with a distinct domination of sinistral transptession. The latter is characteristic for northern and north-eastern parts of IMT. However, in the southern part of IMT dominated conditions of sinistral transpression. Most probably during the sinistral transpression (D1) domains were thrusted towards the south west and the middle crust was tectonic ally thickened. Next during the sinistral transtension in the northern slope of elevated core of dome the crust became extented. In the core of dome the emplacement of Karkonosze granitoids took place. The youngest, rare and non-penetrative dextral shear zones (D3) are related to the later extension during the Stephanian and Early Permian.

Transpression

Transtension

Mylonite

Lineation

Source

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Citations (2)

Oppositely dipping thrusts and transpressional imbricate zone in the Central Eastern Desert of Egypt

Journal of African Earth Sciences (2014)

Mohamed Abd El‐Wahed

Lineation

Transpression

Clockwise

Orogeny

10.1016/j.jafrearsci.2014.06.010

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Citations (42)

Changing Silurian–Devonian relative plate motion in the Caledonides: sinistral transpression to sinistral transtension

Journal of the Geological Society (2003)

John Dewey Rob Strachan

The late Silurian to mid- or late Devonian interval in the Caledonides was a period dominated, sequentially, by sinistral transpression, strike-slip and transtension during the development of mainly non-marine ‘red-bed’ basins following the Ludlow–PrÍdolÍ transition from marine to terrestrial sedimentation. The tectonic event that led to and generated the sinistral Devonian basins was the highly oblique sinistral closure of the Iapetus Ocean between Laurentia and Baltica and between Laurentia and Avalonia. We examine the diachronous closure of Iapetus, the contrasting tectonic modes arising from that closure, and the nature and origin of subsequent Devonian deformation north and south of the Iapetus Suture in the context of progressively changing, sinistrally dominated relative plate motion between Laurentia and Avalonia–Baltica. We suggest that, from about 435 to 395 Ma, there was about 1200 km of sinistral strike-slip relative motion between Laurentia and Baltica. Our lower and upper estimates of Silurian–Devonian relative plate motion rates of 30 mm a −1 and 67 mm a −1 based upon geological data, are similar to present rates.

Transtension

Transpression

Devonian

10.1144/0016-764902-085

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Citations (276)