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<title>UTas ePrints - Multiple deformation episodes at Myra Falls volcanic-hosted massive sulfide camp, central Vancouver Island, British Columbia, Canada</title>
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<meta content="Jones, Sarah" name="eprints.creators_name" />
<meta content="Berry, R.F." name="eprints.creators_name" />
<meta content="Sinclair, B.J." name="eprints.creators_name" />
<meta content="sarah.jones@rsgglobal.com" name="eprints.creators_id" />
<meta content="Ron.Berry@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-09-27" name="eprints.datestamp" />
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<meta content="Multiple deformation episodes at Myra Falls volcanic-hosted massive sulfide camp, central Vancouver Island, British Columbia, Canada" name="eprints.title" />
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<meta content="British Columbia, brittle deformation, Canada,
faults, Myra Falls Deposit, overprinting,
polyphase, deformation history, Vancouver Island" name="eprints.keywords" />
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<meta content="A detailed deformation history for central Vancouver Island was determined at Myra Falls volcanic-hosted massive sulfide camp with early ductile deformation overprinted by several distinct episodes of brittle deformation. Brittle structures were subdivided into separate groups based on their morphology, geometry, kinematics, and crosscutting relations. The central location of this study provides a link between previous deformation studies in northem and southem Vancouver Island. Late Paleozoic northeast-southwest compression (D I) produced open upright folds with variably developed north-northwest-striking axial planar cleavage zones (SI) and subhorizontal stretching lineations (LI) subparallel to FI fold axes. Renewed northeast-southwest compression during the collision of Wrangellia and North America produced a second foliation (S2) in localized shear zones, slightly oblique to the dominant SI foliation. These two events are recorded throughout Vancouver Island wherever the basement is exposed. Mid-Cretaceous northeastsouthwest
compression during D3 produced early Steep conjugate strike-slip faults (D3a), overprinted by northeast-and southwest-dipping thrust faults and bedding-parallel shears (D3b). D3 structures have been previously recognized in northem Vancouver Island but not as far south as Myra Falls. North-south extension (D4) produced east, north, and east-southeast-striking normal faults . These faults consistently crosscut earlier D I-D3 structures and reactivate steep D3a faults. Normal faulting is correlated with the development of the Upper Cretaceous Nanaimo Basin, but no faults of this age have previous been reported from onshore studies. The youngest structures at Myra Falls are large northweststriking,
northeast-dipping tbrust faults and steep west-to west-northwest-striking sinistral strike-slip faults formed during the Ds event. These faults are gouge-rich, wavy anastomosing structures, with cleaved wall-rock zones up to several metres wide. The Ds faults are correlated with Eocene deformation caused by the accretion of the Pacific Rim and Crescent Terranes along the southwestern margin of Vancouver Island. Myra Falls is the northemmost location to have been reported, at which the structures formed as part of the Cowichan fold and tbrust belt." name="eprints.abstract" />
<meta content="2006-11" name="eprints.date" />
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<meta content="Canadian Journal of Earth Sciences" name="eprints.publication" />
<meta content="43" name="eprints.volume" />
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<meta content="Barrett, TJ., and Sherlock, R.L. 1996. Vokanic stratigraphy, lithogeochemistry, and seafloor setting of the H-W massive sulfide deposit, Myra Falls, Vancouver Island, British Columbia. Exploration and Mining Geology, 5: 421-458.
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GJ. 1991. Regional metallogeny. In Geology of the Cordilleran Orogen in Canada. Edited by H. Gabrielse and CJ. Yorath. Geological Survey of Canada, Ottawa, Ont., Geology of Canada, No. 4, Vol. G-2, Chap. 19, pp. 707-768. Dickinson, W.R. 1976. Sedimentary basins developed during evolution of Mesozoic-Cenozoic arc-trench system in western North America. Canadian Journal of Earth Sciences, 13: 1268-1287. England, T.DJ. 1990. Late Cretaceous to Paleogene evolution of the Georgia Basin, southwestern British Columbia. Ph.D. thesis,
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and massive sulfide deposits. Centre for Ore Deposit Research, University of Tasmania, Hobart, Australia, Special Publication 3, Abstract VoL, pp. 195-196. Umhoefer, P.J. 1987. Northward translation of the "Baja British Columbia" along the Late Cretaceous to Paleocene margin of western North America. Tectonics, 6: 377-394. Walker, 1985. Westrnin resources' massive sulphide deposits, Vancouver
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Yorath, C.1., Sutherland Brown, A., and Massey, N.WD. 1999. Lithoprobe, southern Vaocouver lsland, British Columbia: Geology. Geological Survey of Canada, Bulletin 498, 145 p." name="eprints.referencetext" />
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<meta content="A detailed deformation history for central Vancouver Island was determined at Myra Falls volcanic-hosted massive sulfide camp with early ductile deformation overprinted by several distinct episodes of brittle deformation. Brittle structures were subdivided into separate groups based on their morphology, geometry, kinematics, and crosscutting relations. The central location of this study provides a link between previous deformation studies in northem and southem Vancouver Island. Late Paleozoic northeast-southwest compression (D I) produced open upright folds with variably developed north-northwest-striking axial planar cleavage zones (SI) and subhorizontal stretching lineations (LI) subparallel to FI fold axes. Renewed northeast-southwest compression during the collision of Wrangellia and North America produced a second foliation (S2) in localized shear zones, slightly oblique to the dominant SI foliation. These two events are recorded throughout Vancouver Island wherever the basement is exposed. Mid-Cretaceous northeastsouthwest
compression during D3 produced early Steep conjugate strike-slip faults (D3a), overprinted by northeast-and southwest-dipping thrust faults and bedding-parallel shears (D3b). D3 structures have been previously recognized in northem Vancouver Island but not as far south as Myra Falls. North-south extension (D4) produced east, north, and east-southeast-striking normal faults . These faults consistently crosscut earlier D I-D3 structures and reactivate steep D3a faults. Normal faulting is correlated with the development of the Upper Cretaceous Nanaimo Basin, but no faults of this age have previous been reported from onshore studies. The youngest structures at Myra Falls are large northweststriking,
northeast-dipping tbrust faults and steep west-to west-northwest-striking sinistral strike-slip faults formed during the Ds event. These faults are gouge-rich, wavy anastomosing structures, with cleaved wall-rock zones up to several metres wide. The Ds faults are correlated with Eocene deformation caused by the accretion of the Pacific Rim and Crescent Terranes along the southwestern margin of Vancouver Island. Myra Falls is the northemmost location to have been reported, at which the structures formed as part of the Cowichan fold and tbrust belt." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Multiple deformation episodes at Myra Falls volcanic-hosted massive sulfide camp, central Vancouver Island, British Columbia, Canada</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Jones, Sarah</span> and <span class="person_name">Berry, R.F.</span> and <span class="person_name">Sinclair, B.J.</span> (2006) <xhtml:em>Multiple deformation episodes at Myra Falls volcanic-hosted massive sulfide camp, central Vancouver Island, British Columbia, Canada.</xhtml:em> Canadian Journal of Earth Sciences, 43 (11). pp. 1711-1732. ISSN 0008-4077</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_2468' );" href="http://eprints.utas.edu.au/1993/1/Jones%2CBerry%2CSinclair_2006.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_2468' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_2468"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/1993/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/1993/1/Jones%2CBerry%2CSinclair_2006.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />4Mb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cjes_e06-050_43_ns_nf_cjes11-06">http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cjes_e06-050_43_ns_nf_cjes11-06</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">A detailed deformation history for central Vancouver Island was determined at Myra Falls volcanic-hosted massive sulfide camp with early ductile deformation overprinted by several distinct episodes of brittle deformation. Brittle structures were subdivided into separate groups based on their morphology, geometry, kinematics, and crosscutting relations. The central location of this study provides a link between previous deformation studies in northem and southem Vancouver Island. Late Paleozoic northeast-southwest compression (D I) produced open upright folds with variably developed north-northwest-striking axial planar cleavage zones (SI) and subhorizontal stretching lineations (LI) subparallel to FI fold axes. Renewed northeast-southwest compression during the collision of Wrangellia and North America produced a second foliation (S2) in localized shear zones, slightly oblique to the dominant SI foliation. These two events are recorded throughout Vancouver Island wherever the basement is exposed. Mid-Cretaceous northeastsouthwest
compression during D3 produced early Steep conjugate strike-slip faults (D3a), overprinted by northeast-and southwest-dipping thrust faults and bedding-parallel shears (D3b). D3 structures have been previously recognized in northem Vancouver Island but not as far south as Myra Falls. North-south extension (D4) produced east, north, and east-southeast-striking normal faults . These faults consistently crosscut earlier D I-D3 structures and reactivate steep D3a faults. Normal faulting is correlated with the development of the Upper Cretaceous Nanaimo Basin, but no faults of this age have previous been reported from onshore studies. The youngest structures at Myra Falls are large northweststriking,
northeast-dipping tbrust faults and steep west-to west-northwest-striking sinistral strike-slip faults formed during the Ds event. These faults are gouge-rich, wavy anastomosing structures, with cleaved wall-rock zones up to several metres wide. The Ds faults are correlated with Eocene deformation caused by the accretion of the Pacific Rim and Crescent Terranes along the southwestern margin of Vancouver Island. Myra Falls is the northemmost location to have been reported, at which the structures formed as part of the Cowichan fold and tbrust belt.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">Deposited in accordance with the copyright policy of the publisher. The definitive version is available at NRC Canada Research Press http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cjes_e06-050_43_ns_nf_cjes11-06</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">British Columbia, brittle deformation, Canada,
faults, Myra Falls Deposit, overprinting,
polyphase, deformation history, Vancouver Island</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences > 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1993</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">27 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1993;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1993">item control page</a></p>
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