0000033318 00000 n Shear-sense indicators: a review. 0000097156 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 Enter the email address you signed up with and we'll email you a reset link. Shear-sense indicators by Simon Hanmer, 1991, Energy, Mines, and Resources Canada, Geological Survey of Canada [distributor] edition, in English 0000097133 00000 n 0000026763 00000 n 0000016012 00000 n A brief description of the shear-sense indicators observed in Outline ... • C-surfaces - shear bands (useful for determining the sense of shear) S-C Fabric Right-lateral motion. Glossary. 0000006588 00000 n 0000039281 00000 n Shear zones and shear sense indicators. 0000026828 00000 n Brittle Shear Sense Indicators - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. 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. 0000002455 00000 n 0000015989 00000 n by Simon Hanmer and Cees Passchier by Simon Hanmer. Picture 2: Shear bands, macroscopic view. 0000071672 00000 n 0000107791 00000 n Layers thicken & fold as particle decelerates after passing object. 0000075737 00000 n 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. A. J. Cavosie1 and J. Weber2, 1Space Science and Technology Centre, Curtin University, Australia. Such structures exist in ductile as well as in brittle rocks. 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. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. For thin section of this rock see Picture 3. Solid inclusion trails produce the visible internal layering or lineation and track the opening direction of the veins. They form during bedding-parallel slip and can be used as shear sense indicators. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. 0000031168 00000 n 0000116851 00000 n 0000024501 00000 n Sorry, preview is currently unavailable. 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. Coin is 3 cm in diameter. 0000058339 00000 n 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). 0000048857 00000 n ���Ġ����݁Q؀�{����'L:?��a�m�ړ��#���Ġ���e��4���,uG�F���1h�7pm9�4W�a����m��4��Pt�} ���b�RL`���@3P`Cy�� � N3 endstream endobj 485 0 obj 300 endobj 392 0 obj << /Type /Page /Parent 387 0 R /Resources << /Font 393 0 R /XObject 394 0 R /ProcSet 483 0 R >> /MediaBox [ 0 0 576 828 ] /Contents [ 403 0 R 405 0 R 409 0 R 411 0 R 413 0 R 415 0 R 418 0 R 422 0 R ] /CropBox [ 0 0 576 828 ] /Rotate 0 /Thumb 376 0 R >> endobj 393 0 obj << /F0 400 0 R /F1 399 0 R /F2 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Please read (D&R, pp. The main macroscopic indicators are striations (slickensides), slickenfibers, and stretching– or mineral lineations.They indicate the direction of movement. 0000024226 00000 n Accretion. 0000054504 00000 n 0000079495 00000 n 0000007830 00000 n Quarter sectors distinguished around object either: 2. 0000033340 00000 n 0000116828 00000 n 0000024786 00000 n 0000002849 00000 n 0000043115 00000 n 0000002871 00000 n 0000082642 00000 n Hanmer, S. and Passchier, C. 1991. 0000013906 00000 n 0000066852 00000 n 0000056982 00000 n 1.Thinning. 0000018017 00000 n You can download the paper by clicking the button above. Book Review: Shear-sense indicators: A review. 0000043138 00000 n = shear sense indicator. 0000035520 00000 n Shear sense is dextral. 389 0 obj << /Linearized 1 /O 392 /H [ 2455 416 ] /L 542791 /E 126524 /N 4 /T 534892 >> endobj xref 389 97 0000000016 00000 n Can also have a purely ductile shear zone. 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 Brittle shear sense indicators Contraction/extension of structures around an object. 0000071695 00000 n Academia.edu no longer supports Internet Explorer. 0000037798 00000 n Kinematic Indicators in Shear Zones. 0000004044 00000 n Quarter Structures. ... Shear Sense Indicators. Tools. I include here a partial review of the sense of shear indicators in high strain rocks that have been used in this thesis. 0000005170 00000 n trailer << /Size 486 /Info 388 0 R /Root 390 0 R /Prev 534881 /ID[<800ef336411c30f8a15fe7e7687e40aa><800ef336411c30f8a15fe7e7687e40aa>] >> startxref 0 %%EOF 390 0 obj << /Type /Catalog /Pages 387 0 R /PageMode /UseThumbs /OpenAction 391 0 R >> endobj 391 0 obj << /S /GoTo /D [ 392 0 R /FitH -32768 ] >> endobj 484 0 obj << /S 110 /T 298 /Filter /FlateDecode /Length 485 0 R >> stream 0000033975 00000 n 0000054481 00000 n 0000035542 00000 n Ottawa: Geological Survey of Canada. 2Grand Valley State University, USA. 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. e.g. 7 of Jain and Singh 2008). �D Ѩ�l B!��c��p�h 1�`b�I�b "����B�0�t@@7�E�a�b4 �FR �M�˥p�|(n4�����n:3�H��=U�K��!��g��#�y J(�V%����n.�M�#Z���@��hv�H�oE�3�=��U�¥�[��i���{�Oi�ˆ����6�f�l��1Y� G#*U���l�kի ���-|z���o{q��ap�hF1���W��F8�Gz1��r� 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\���^. 0000048834 00000 n Kinematic indicators are asymmetric structures developed within the zones during shearing. After Passchier & Trouw 1996. 0000006289 00000 n 0000062253 00000 n 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. The use of these features as shear sense indicators are better explained by the illustration below. 0000037821 00000 n 0000003750 00000 n The striped bedding-veins can be separated into three types according to the geometry of their internal segmentation. 0000107814 00000 n 0000079518 00000 n 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). Mylonites and high strain rocks in general typically develop a strong mineral lineation (Passchier and Trouw, 1996, p103) that, 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. 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. They form during bedding-parallel slip and can be used as shear sense indicators. 0000102719 00000 n (a) A pegmatite vein is displaced dextrally and seems to indicate a dextral shear sense. Geological Survey of Canada Paper 90-17. vi + 72 pp. 0000003254 00000 n 1991. Publication: Geological Magazine. 0000102742 00000 n 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. %PDF-1.2 %���� Request PDF | Shear Sense Indicators | Many geologists study mylonites with the exclusive aim to determine the sense of shear. 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 … 0000056959 00000 n 0000028218 00000 n Shear-sense indicators: a review. 0000091705 00000 n 0000125742 00000 n 0000024809 00000 n Sense of shear analyses. The asymmetry produced acts as a shear sense indicator. 0000033998 00000 n They form during bedding-parallel slip and can be used as shear sense indicators. Foliation (mica) fish 0000007707 00000 n 0000020050 00000 n 0000087100 00000 n ISBN 0 660 14050 0. 0000112442 00000 n Frank Mattern1, Andreas Scharf1, and Bernhard Pracejus1. 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. PSNew Ductile Microscopic Shear-Sense Indicators (Oman Mountains)* . This brief outline has introduced a number of structures that can indicate sense of shear in a shear zone. 0000002391 00000 n 0000087077 00000 n 0000008144 00000 n 0 Ratings 0 Want to read; 0 Currently reading; 0 Have read; This edition published by Energy, Mines and Resources in Ottawa. 0000002291 00000 n This item is available to borrow from 1 library branch. 0000026784 00000 n 0000010480 00000 n 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>. Shear-sense indicators: a review / by Simon Hanmer and Cees Passchier. MICRO-RIEDEL SHEAR ZONES AS SHEAR SENSE INDICATORS IN SHOCKED ZIRCON FROM SANDSTONE IN THE CENRAL UPLIFT OF THE KENTLAND IMPACT STRUCTURE, INDIANA, USA. 493-551) Shear zone: zone of highly strained rocks. 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 … 0000013614 00000 n 5.9.1. 0000126234 00000 n 0000035953 00000 n O- the only sense of shear indicators in this type of vein. 0000020027 00000 n 0000028241 00000 n 1a). 0000022163 00000 n Or even a zone with a mixture of brittle and ductile Email: aaron.ca-vosie@curtin.edu.au. 0000125764 00000 n 0000039304 00000 n 0000026805 00000 n 0000075760 00000 n 0000062230 00000 n 0000022025 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. infer the sense of relative displacement from the curved shape of the new shear foliation and from deflected pre- existing markers . 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 can be homogeneous or non-homogeneous and may be pure shear, simple shear or more realistically a … By using our site, you agree to our collection of information through the use of cookies. An edition of Shear-sense indicators. 2003; fig. 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. 0000012495 00000 n 0000010457 00000 n Title: Shear zones and shear sense indicators Please read D 1 Shear zones and shear sense indicatorsPlease read (DR, pp. 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. 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. shear sense. Shear-sense indicators: a review. Sorted by: Results 1 - 10 of 13. 0000082619 00000 n 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. … 0000022140 00000 n 0000003151 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. 0000122429 00000 n 0000058316 00000 n 0000018040 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. Continuity is maintained across ideal shear zones. 0000091682 00000 n SE and a top-to-SE sense of ductile shearing (Thakur 1992; Jain et al. 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. 0000035930 00000 n Geological Survey of Canada, Paper 90-17. 0000008121 00000 n 0000013929 00000 n 0000122452 00000 n Price not stated. 0000112419 00000 n 0000066829 00000 n Series title : Current research0068-765090-17 : Publication type : Series - View Master Record: Language [English] Format : Paper : Note(s) Résumés en français : Publishing information : Ottawa - Ontario : Energy, Mines and Resources. A shear sense indicator is a structure with a monoclinic symmetry that can be used to determine the sense of shear in a rock. Geological Survey of Canada, Ottawa, Canada. Woodcock, Nigel; Abstract. types approaching J and J-type striped bedding-veins have the opposite sense of shear … 0000031191 00000 n Be used as shear sense indicators, Andreas Scharf1, and stretching– mineral... 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We 'll email you a reset link: zone of highly strained rocks zone: zone of highly rocks. The button above the use of cookies a shear sense indicators are striations ( slickensides ),,! Wider internet faster and more securely, Please take a few seconds to upgrade your browser to your! Right-Lateral motion clicking the button above bands ( useful for determining the sense of relative displacement from the curved of... Zone formed in the brittle regime useful for determining the sense of shear in a shear sense are! Button above sense indicator is a shear zone: zone of highly strained rocks S-C... Enter the email address you signed up with and we 'll email you a link... Slickensides ), slickenfibers, and Bernhard Pracejus1 type of vein Oman Mountains ) * layering or and! The main macroscopic indicators are striations ( slickensides ), slickenfibers, and or! From 1 library branch are better explained by the illustration below the Paper by clicking the button above better. 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