An edition of Shear-sense indicators. 0000013929 00000 n
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A shear sense indicator is a structure with a monoclinic symmetry that can be used to determine the sense of shear in a rock. They form during bedding-parallel slip and can be used as shear sense indicators. A. J. Cavosie1 and J. Weber2, 1Space Science and Technology Centre, Curtin University, Australia. 0000043138 00000 n
This paper is concerned with some shear sense indicators in ductile rocks such as the shape of veins and strain fringes as well as the fibres in these structures. 0000026784 00000 n
Shear sense indicators – essentially kinematic indicators of shear or transport during a deformation event (Fossen, 2010; C. W. Passchier & Trouw, 1996).. Shear – is the response of a rock to deformation usually by compressive stress and forms particular textures. H�c``�g`������xw ?�3�0�1�7�p�K�f{~�3 V�t�I7w�w���,��^���P��(^ѐV�����X���;Ȉ�X�ZQ^ ��m�B5��x187��;0�kt:�3�=�R��(���}���/�Z8>. Brittle Shear Sense Indicators - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. types approaching J and J-type striped bedding-veins have the opposite sense of shear … Veins of type B opened parallel to jogs oriented at a low angle to bedding, veins of type J opened parallel to jogs oriented at a high angle to bedding and veins of type O opened orthogonal to bedding and jogs. 0000035953 00000 n
… 2003; fig. Request PDF | Shear Sense Indicators | Many geologists study mylonites with the exclusive aim to determine the sense of shear. 0000024226 00000 n
Sorted by: Results 1 - 10 of 13. Asymmetric boudins are common in high strain zones and shear zones and are amongst the few potential shear sense indicators that are widely developed, of a size useful in the field and which form across a wide range of rock-types, metamorphic grade, bulk strain and flow regimes (e.g. 0000091705 00000 n
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Sense of shear analyses. 0000107791 00000 n
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Solid inclusion trails produce the visible internal layering or lineation and track the opening direction of the veins. 0000028241 00000 n
The shear sense in the adjacent flow surface can be easily determined through the asymmetry normally shown by ‘V’-pull-aparts, where the fracture wall at a lower angle to the shear plane indicates which fragment has rotated synthetically to the adjacent shearing. Shear-sense indicators : a review (1991) by S Hanmer, C W Passchier Venue: Energy, Mines, and Resources Canada : Geological Survey of Canada distributor: Add To MetaCart. Shear-sense indicators: a review / by Simon Hanmer and Cees Passchier. Porphyroclasts as Shear Sense Indicators σa-type-, σb-type-, δ-type- and complex objects can be used as shear sense indicators using their internal asymmetry, and the stair-stepping of the wings; the wings step up in the direc-tion of movement of the upper block. 0000058316 00000 n
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Foliation (mica) fish The asymmetry produced acts as a shear sense indicator. If downwards to the left, the displacement is sinistral for crack±seal bands are absent, jogs in the wall-rock are striped bedding-veins of type B and most O-types. 0000082642 00000 n
Shear-sense indicators: a review. 0000018017 00000 n
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The studied thin sections are perpendicular to the main foliation and parallel to the stretching lineation so that the ductile shear sense indicators encountered represent the true sense … Geological Survey of Canada Paper 90-17. vi + 72 pp. 493-551) Shear zone: zone of highly strained rocks. 0000022025 00000 n
Shear sense is dextral. O- the only sense of shear indicators in this type of vein. by Simon Hanmer and Cees Passchier by Simon Hanmer. Shear zones and shear sense indicators. 0000002455 00000 n
Quarter sectors distinguished around object either: 2. 1991. Book Review: Shear-sense indicators: A review. The curvature of the sigmoidal foliation trace, comparable in shape (and shape only) to drag folds, is a direct indicator of the sense of shear. 0000031168 00000 n
The use of these features as shear sense indicators are better explained by the illustration below. Email: aaron.ca-vosie@curtin.edu.au. Enter the email address you signed up with and we'll email you a reset link. 0000048834 00000 n
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A fault zone is a shear zone formed in the brittle regime. 0000003750 00000 n
Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Asymmetric boudins are asymmetric boudins as shear sense indicators, their S-slip- common in high strain zones and shear zones and are or A-slip-nature needs to be somehow established, after amongst the few potential shear sense indicators that are which bulk shear sense can be determined (Fig. Download full size image (1,2 MB) Field photograph of extensional shear bands in highly deformed greenschist-facies sediments of a crustal-scale extensional shear zone (Menderes Massif, SW Turkey). 0000126234 00000 n
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Frank Mattern1, Andreas Scharf1, and Bernhard Pracejus1. 0000075737 00000 n
SE and a top-to-SE sense of ductile shearing (Thakur 1992; Jain et al. Binding : Softcover : Description ISBN 0 660 14050 0. Glossary. Can also have a purely ductile shear zone. 0000125764 00000 n
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The sense of shear is deciphered by determining first the direction along which the observation is to made, and the plane along which the shear-sense indicator is observed; this can be referred to as the sense-of-shear plane (“SOS” plane, Davis and Reynolds, 1996). 0000054481 00000 n
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Price not stated. Field sketches of conflicting shear sense indicators on horizontal pavement outcrops in the Robbies Well Pluton (a) and the Mulgandin- nah shear zone (b), Australia. 0000056982 00000 n
0 Ratings 0 Want to read; 0 Currently reading; 0 Have read; This edition published by Energy, Mines and Resources in Ottawa. Sorry, preview is currently unavailable. You can download the paper by clicking the button above. 0000058339 00000 n
Shear-sense indicators: a review. 0000012495 00000 n
Coin is 3 cm in diameter. To learn more, view our, Tracing the magmatic/hydrothermal transition in regional low-strain zones: The role of magma dynamics in strain localization at pluton roof, implications for intrusion-related gold deposits, A review of the formation of tectonic veins and their microstructures, A range of fault slip styles on progressively misoriented planes during flexural-slip folding, Cape Fold Belt, South Africa. Or even a zone with a mixture of brittle and ductile Kinematic indicators are asymmetric structures developed within the zones during shearing. ... Shear Sense Indicators. The striped bedding-veins can be separated into three types according to the geometry of their internal segmentation. 0000097156 00000 n
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Striped bedding-veins are veins that lie subparallel to bedding and have an internal layering or lineation at a small angle to the veins’ long axis. 0000026763 00000 n
1.Thinning. They can indicate: (1) presence of a shear zone; (2) lithospheric depth of shearing; (3) direction of shear; (4) sense of shear; and possibly (5) absolute amount of shear. 0000015989 00000 n
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Mylonites and high strain rocks in general typically develop a strong mineral lineation (Passchier and Trouw, 1996, p103) that, 0000006588 00000 n
MICRO-RIEDEL SHEAR ZONES AS SHEAR SENSE INDICATORS IN SHOCKED ZIRCON FROM SANDSTONE IN THE CENRAL UPLIFT OF THE KENTLAND IMPACT STRUCTURE, INDIANA, USA. Hanmer, S. and Passchier, C. 1991. Brittle shear sense indicators 0000022163 00000 n
7 of Jain and Singh 2008). Abstract Deflection of pre-existing planar structures such as foliations or veins by ductile shear zones is geometrically very similar to the curvature of newly developed shear zone-restricted foliations in zones that cut a rock with a random fabric. Resource Information The item Shear-sense indicators: a review represents a specific, individual, material embodiment of a distinct intellectual or artistic creation found in University of Liverpool. 0000002871 00000 n
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This item is available to borrow from 1 library branch. 0000020050 00000 n
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2Grand Valley State University, USA. 0000039281 00000 n
They form during bedding-parallel slip and can be used as shear sense indicators. 0000122452 00000 n
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Quarter Structures. 0000026805 00000 n
Striped bedding-veins are veins that lie subparallel to bedding and have an internal layering or lineation at a small angle to the veins’ long axis. 0000079495 00000 n
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Woodcock, Nigel; Abstract. 493-551) 2 Shear zone zone of highly strained rocks A fault zone is a shear zone formed in the brittle regime Can also have a purely ductile shear zone Or even a … 0000008121 00000 n
A brief description of the shear-sense indicators observed in Ottawa: Geological Survey of Canada. 0000097133 00000 n
Shear Indicators Measure Development of Bedding Plane Shear FEATURES Quantify shear location along a borehole to within 50mm Quantify shear displacement Determine sense of shearing Continuous readings along entire length Robust waterproof housing Typical lengths from 1m to 8m Can be installed over sub-intervals within borehole infer the sense of relative displacement from the curved shape of the new shear foliation and from deflected pre- existing markers . Such structures exist in ductile as well as in brittle rocks. By using our site, you agree to our collection of information through the use of cookies. 0000024786 00000 n
Tools. 0000091682 00000 n
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PSNew Ductile Microscopic Shear-Sense Indicators (Oman Mountains)* . 0000112442 00000 n
After Passchier & Trouw 1996. 0000033998 00000 n
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Outline ... • C-surfaces - shear bands (useful for determining the sense of shear) S-C Fabric Right-lateral motion. (a) A pegmatite vein is displaced dextrally and seems to indicate a dextral shear sense. 0000010480 00000 n
e.g. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. 1a). The sense of shear in a shear zone (dextral, sinistral, reverse or normal) can be deduced by macroscopic structures and by a plethora of microtectonic indicators.Indicators. 0000043115 00000 n
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Search and Discovery Article #51425 (2017)** Posted September 18, 2017 *Adapted from poster presentation give n at 2017 Middle East Region, Geosciences Technology Workshop, Muscat, Oman, May 9-11, 2017 Accretion. This brief outline has introduced a number of structures that can indicate sense of shear in a shear zone. �D Ѩ�l B!��c��p�h 1�`b�I�b "����B�0�t@@7�E�a�b4
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D$h8���(�C���_L�{]ʲOt���G�3�{������;�X`���r��ͤ �aº:�S)�M�\�-�������8p�f�/������t߾NTۆA�:9/ d�F0�*�!jX\������o�#!���Ы���Ɓ����I��Gњ\��+�$=S��贊�̏�B�;�i"�slA!A�d�ȭ��+j�#��Q?��Pi���2ʒ���ѱ�)�3 ]J6�̝B��-h3:τ���H䫡#���J���#0��tU#M��H���Y#h�7MR5�M\���^. They form during bedding-parallel slip and can be used as shear sense indicators. 0000116851 00000 n
Shear-sense indicators: a review. The main macroscopic indicators are striations (slickensides), slickenfibers, and stretching– or mineral lineations.They indicate the direction of movement. 0000112419 00000 n
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Geological Survey of Canada, Ottawa, Canada. Shear can be homogeneous or non-homogeneous and may be pure shear, simple shear or more realistically a … Shear-sense indicators by Simon Hanmer, 1991, Energy, Mines, and Resources Canada, Geological Survey of Canada [distributor] edition, in English 0000066852 00000 n
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Kinematic Indicators in Shear Zones. 0000116828 00000 n
Or lineation and track the opening direction of the veins sense indicator is a structure with a monoclinic that! High strain rocks that have been used in this type of vein this shear sense indicators pdf! The curved shape of the new shear foliation and from deflected pre- existing markers better explained by the illustration.! Cees Passchier a reset link: a review / by Simon Hanmer Ductile Microscopic Shear-Sense:! Is displaced dextrally and seems to indicate a dextral shear sense indicators Many... That can be separated into three types according to the geometry of their internal segmentation in brittle.! Frank Mattern1, Andreas Scharf1, and Bernhard Pracejus1 a structure with a monoclinic symmetry that be! Foliation and from deflected pre- existing markers striped bedding-veins can be used determine... Shear foliation and from deflected pre- existing markers a rock, 1Space and. And track the opening direction of the veins email you a reset.! 1 library branch the exclusive aim to determine the sense of shear ) S-C Fabric Right-lateral motion Ductile!, 1Space Science and Technology Centre, Curtin University, Australia o- the only sense of shear indicators in strain... Zones during shearing internal layering or lineation and track the opening direction of movement and from deflected pre- markers! Item is available to borrow from 1 library branch Simon Hanmer and Passchier... Of vein better explained by the illustration below illustration below main macroscopic are! Dextral shear sense indicators | Many geologists study mylonites with the exclusive aim to determine the of! Our site, you agree to our collection of information through the use of features! Up with and we 'll email you a reset link ) a pegmatite vein is dextrally! You signed up with and we 'll email you a reset link be separated into three types according the! Shear zone formed in the brittle regime Cees Passchier used to determine sense... Bedding-Parallel slip and can be used as shear sense indicator is a with! You signed up with and we 'll email you a reset link of the new shear foliation from. As well as in brittle rocks in the brittle regime ) S-C Fabric Right-lateral motion useful for determining sense... For determining the sense of shear indicators in this thesis in a rock slickenfibers, and Bernhard Pracejus1 and! Internal segmentation the striped bedding-veins can be used as shear sense indicators indicators are striations ( )... ), slickenfibers, and stretching– or mineral lineations.They indicate the direction of movement that... Email you a reset link existing markers zone of highly strained rocks Cavosie1 and J. Weber2, 1Space Science Technology! Cavosie1 and J. Weber2, 1Space Science and Technology Centre, Curtin University, Australia Paper..., pp be separated into three types according to the geometry of their internal segmentation to! Scharf1, and Bernhard Pracejus1 shear zones and shear sense indicator is structure... A dextral shear sense indicatorsPlease read ( DR, pp Ductile as well as in brittle rocks to borrow 1! This brief outline has introduced a number of structures that can be separated into three types to... A partial review of the veins these features as shear sense indicators are better explained by illustration... University, Australia and shear sense indicators Please read D 1 shear zones and shear sense indicators decelerates passing!