Title: Shear zones and shear sense indicators Please read D 1 Shear zones and shear sense indicatorsPlease read (DR, pp. A fault zone is a shear zone formed in the brittle regime. 0000006588 00000 n 0000024786 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. 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. Request PDF | Shear Sense Indicators | Many geologists study mylonites with the exclusive aim to determine the sense of shear. 0000091705 00000 n Foliation (mica) fish 5.9.1. 7 of Jain and Singh 2008). Kinematic Indicators in Shear Zones. %PDF-1.2 %���� The striped bedding-veins can be separated into three types according to the geometry of their internal segmentation. 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. by Simon Hanmer and Cees Passchier by Simon Hanmer. 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. 0000013614 00000 n Shear zones and shear sense indicators. Publication: Geological Magazine. types approaching J and J-type striped bedding-veins have the opposite sense of shear … 0000020027 00000 n 0000026763 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. Academia.edu no longer supports Internet Explorer. 493-551) Shear zone: zone of highly strained rocks. Sorted by: Results 1 - 10 of 13. 0000022140 00000 n 0000033975 00000 n 0000054481 00000 n 0 Ratings 0 Want to read; 0 Currently reading; 0 Have read; This edition published by Energy, Mines and Resources in Ottawa. Sense of shear analyses. Coin is 3 cm in diameter. PSNew Ductile Microscopic Shear-Sense Indicators (Oman Mountains)* . A shear sense indicator is a structure with a monoclinic symmetry that can be used to determine the sense of shear in a rock. 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. 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 Woodcock, Nigel; Abstract. 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. 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. 0000002871 00000 n 0000039304 00000 n Layers thicken & fold as particle decelerates after passing object. ���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 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geometrically very similar to the curvature of newly developed shear zone-restricted foliations in zones that cut a rock with a random fabric. Brittle shear sense indicators 0000003750 00000 n 0000007830 00000 n 0000024226 00000 n 0000022163 00000 n 0000056959 00000 n 0000043138 00000 n Shear-sense indicators: a review. 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. Shear sense is dextral. 0000075737 00000 n 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 … 0000039281 00000 n 0000125742 00000 n This brief outline has introduced a number of structures that can indicate sense of shear in a shear zone. After Passchier & Trouw 1996. 0000116851 00000 n 0000097133 00000 n Enter the email address you signed up with and we'll email you a reset link. O- the only sense of shear indicators in this type of vein. 0000048834 00000 n 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. 0000107814 00000 n 0000122452 00000 n Continuity is maintained across ideal shear zones. 0000026828 00000 n 0000066852 00000 n Glossary. 0000016012 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. 0000035520 00000 n �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\���^. They form during bedding-parallel slip and can be used as shear sense indicators. ... Shear Sense Indicators. 0000010457 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. The main macroscopic indicators are striations (slickensides), slickenfibers, and stretching– or mineral lineations.They indicate the direction of movement. A. J. Cavosie1 and J. Weber2, 1Space Science and Technology Centre, Curtin University, Australia. Please read (D&R, pp. 0000062230 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. Shear-sense indicators: a review. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Shear-sense indicators: a review. 0000035542 00000 n 0000026805 00000 n To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. 0000013929 00000 n Geological Survey of Canada Paper 90-17. vi + 72 pp. 0000075760 00000 n 0000102719 00000 n 0000071672 00000 n Brittle Shear Sense Indicators - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Such structures exist in ductile as well as in brittle rocks. 0000018040 00000 n Price not stated. Contraction/extension of structures around an object. A brief description of the shear-sense indicators observed in 0000031168 00000 n Book Review: Shear-sense indicators: A review. You can download the paper by clicking the button above. infer the sense of relative displacement from the curved shape of the new shear foliation and from deflected pre- existing markers . 0000006289 00000 n For thin section of this rock see Picture 3. 0000028218 00000 n This item is available to borrow from 1 library branch. The asymmetry produced acts as a shear sense indicator. 0000082642 00000 n 0000043115 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). 0000035930 00000 n Mylonites and high strain rocks in general typically develop a strong mineral lineation (Passchier and Trouw, 1996, p103) that, 0000097156 00000 n 0000002455 00000 n 2003; fig. 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 0000002391 00000 n 0000010480 00000 n Email: aaron.ca-vosie@curtin.edu.au. 0000002291 00000 n 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. 0000007707 00000 n 0000079495 00000 n I include here a partial review of the sense of shear indicators in high strain rocks that have been used in this thesis. 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