An edition of Shear-sense indicators. 0000013929 00000 n 0000033318 00000 n 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 0000071672 00000 n Sense of shear analyses. 0000107791 00000 n 0000107814 00000 n 0000007707 00000 n 0000062253 00000 n 0000024809 00000 n 0000102742 00000 n 0000006289 00000 n 0000048857 00000 n 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 0000066829 00000 n 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 %PDF-1.2 %���� 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 0000010457 00000 n 0000020027 00000 n 0000039304 00000 n 0000013614 00000 n 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 0000037821 00000 n 0000087077 00000 n 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 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). 0000054481 00000 n 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 0000004044 00000 n 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 0000035930 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. 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 0000008144 00000 n 0000026828 00000 n 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 0000002391 00000 n 0000087100 00000 n 0000082619 00000 n 0000062230 00000 n This item is available to borrow from 1 library branch. 0000020050 00000 n 0000003151 00000 n 0000016012 00000 n 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 0000035520 00000 n 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 0000024501 00000 n 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 0000037798 00000 n 0000013906 00000 n PSNew Ductile Microscopic Shear-Sense Indicators (Oman Mountains)* . 0000112442 00000 n After Passchier & Trouw 1996. 0000033998 00000 n 0000122429 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 396 0 R /F3 397 0 R /F4 406 0 R /F5 416 0 R >> endobj 394 0 obj << /im1 420 0 R /im2 426 0 R /im3 428 0 R /im4 420 0 R /im5 430 0 R /im6 432 0 R /im7 434 0 R /im8 436 0 R /im9 438 0 R /im10 440 0 R /im11 442 0 R /im12 444 0 R /im13 446 0 R /im14 448 0 R /im15 450 0 R /im16 452 0 R /im17 454 0 R /im18 456 0 R /im19 458 0 R /im20 460 0 R /im21 462 0 R /im22 464 0 R /im23 466 0 R /im24 468 0 R /im25 470 0 R /im26 472 0 R /im27 474 0 R /im28 476 0 R /im29 478 0 R /im30 480 0 R /im31 482 0 R /im32 419 0 R >> endobj 395 0 obj << /Type /FontDescriptor /FontName /BookAntiqua,BoldItalic /Flags 16482 /FontBBox [ -250 -276 1200 931 ] /MissingWidth 759 /StemV 143 /StemH 143 /ItalicAngle -11 /CapHeight 931 /XHeight 651 /Ascent 931 /Descent 276 /Leading 207 /MaxWidth 1000 /AvgWidth 448 >> endobj 396 0 obj << /Type /Font /Subtype /TrueType /Name /F2 /BaseFont /TimesNewRomanMTExtraBold,Bold /FirstChar 31 /LastChar 255 /Widths [ 500 265 281 564 668 510 777 709 297 375 375 469 667 292 365 292 281 530 530 530 530 530 530 530 530 530 530 292 292 667 667 667 458 927 699 678 668 773 668 626 761 834 438 553 782 616 991 793 824 678 824 772 626 657 730 720 1064 730 730 699 344 281 344 506 500 333 490 542 469 542 479 344 531 542 292 281 595 301 782 542 531 542 553 427 385 333 531 458 709 553 500 458 396 219 396 667 500 500 500 292 563 553 1000 500 500 333 1061 626 302 991 500 500 500 500 292 292 553 553 354 500 1000 333 1052 385 302 678 500 500 730 265 281 469 539 696 729 219 564 333 771 330 521 667 365 771 500 410 668 330 330 333 607 583 292 333 330 357 521 777 777 777 458 699 699 699 699 699 699 980 668 668 668 668 668 438 438 438 438 773 793 824 824 824 824 824 667 824 730 730 730 730 730 678 542 490 490 490 490 490 490 657 469 479 479 479 479 292 292 292 292 531 542 531 531 531 531 531 668 531 531 531 531 531 500 542 500 ] /Encoding /WinAnsiEncoding /FontDescriptor 398 0 R >> endobj 397 0 obj << /Type /Font /Subtype /TrueType /Name /F5 /BaseFont /BookAntiqua,BoldItalic /FirstChar 31 /LastChar 255 /Widths [ 750 250 333 500 606 500 889 833 250 333 333 444 606 250 389 250 315 500 500 500 500 500 500 500 500 500 500 250 250 606 606 606 444 833 722 667 685 778 611 556 778 778 389 389 722 611 944 778 833 667 833 722 556 611 778 667 1000 722 611 667 333 606 333 606 500 333 556 537 444 556 444 333 500 556 333 333 556 333 833 556 556 556 537 389 444 389 556 556 833 500 556 500 333 606 333 606 750 500 750 250 500 500 1000 556 556 333 1000 556 333 944 750 750 750 750 278 278 500 500 606 500 1000 333 1000 444 333 778 750 750 611 250 333 500 500 606 500 606 556 333 747 333 500 606 389 747 500 400 549 361 361 333 576 556 250 333 361 333 500 889 889 889 444 722 722 722 722 722 722 944 685 611 611 611 611 389 389 389 389 778 778 833 833 833 833 833 606 833 778 778 778 778 611 667 556 556 556 556 556 556 556 738 444 444 444 444 444 333 333 333 333 556 556 556 556 556 556 556 549 556 556 556 556 556 556 556 556 ] /Encoding /WinAnsiEncoding /FontDescriptor 395 0 R >> endobj 398 0 obj << /Type /FontDescriptor /FontName /TimesNewRomanMTExtraBold,Bold /Flags 16418 /FontBBox [ -250 -250 1267 944 ] /MissingWidth 500 /StemV 161 /StemH 161 /ItalicAngle 0 /CapHeight 944 /XHeight 660 /Ascent 944 /Descent 250 /Leading 194 /MaxWidth 1056 /AvgWidth 444 >> endobj 399 0 obj << /Type /Font /Subtype /TrueType /Name /F1 /BaseFont /CenturySchoolbook,Italic /FirstChar 31 /LastChar 255 /Widths [ 750 278 333 400 606 556 833 852 278 333 333 500 606 278 333 278 606 556 556 556 556 556 556 556 556 556 556 278 278 606 606 606 444 747 704 722 722 778 722 667 778 833 407 611 741 667 944 815 778 667 778 741 667 685 815 704 926 704 685 667 333 606 333 606 500 333 574 556 444 611 444 333 537 611 333 315 556 333 889 611 500 574 556 444 444 352 611 519 778 500 500 463 333 606 333 606 750 750 750 204 556 389 1000 500 500 333 1000 667 333 981 750 750 750 750 204 204 389 389 606 500 1000 333 950 444 333 778 750 750 685 287 333 556 556 606 556 606 500 333 747 422 426 606 333 747 500 400 549 333 333 333 576 650 278 333 333 372 426 833 833 833 444 704 704 704 704 704 704 870 722 722 722 722 722 407 407 407 407 778 815 778 778 778 778 778 606 778 815 815 815 815 685 667 556 574 574 574 574 574 574 722 444 444 444 444 444 333 333 333 333 500 611 500 500 500 500 500 549 500 611 611 611 611 500 574 500 ] /Encoding /WinAnsiEncoding /FontDescriptor 401 0 R >> endobj 400 0 obj << /Type /Font /Subtype /TrueType /Name /F2 /BaseFont /TimesNewRoman /Encoding /WinAnsiEncoding >> endobj 401 0 obj << /Type /FontDescriptor /FontName /CenturySchoolbook,Italic /Flags 98 /FontBBox [ -250 -212 1200 970 ] /MissingWidth 758 /StemV 83 /StemH 83 /ItalicAngle -11 /CapHeight 970 /XHeight 679 /Ascent 970 /Descent 212 /Leading 212 /MaxWidth 1000 /AvgWidth 455 >> endobj 402 0 obj 2235 endobj 403 0 obj << /Filter /LZWDecode /Length 402 0 R >> stream 0000028218 00000 n 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 0000033340 00000 n 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 �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. 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 0000102719 00000 n 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 0000056959 00000 n 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!