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<title>UTas ePrints - Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia</title>
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<meta content="Thorkelson, D.J." name="eprints.creators_name" />
<meta content="Mortensen, J.K." name="eprints.creators_name" />
<meta content="Creaser, R.A." name="eprints.creators_name" />
<meta content="Davidson, G.J." name="eprints.creators_name" />
<meta content="Abbott, J.G." name="eprints.creators_name" />
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<meta content="Garry.Davidson@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-03-01" name="eprints.datestamp" />
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<meta content="Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia" name="eprints.title" />
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<meta content="Northwestern Laurentia, after cratonization at about 1.85 Ga, underwent a series of tectonic and magmatic events during the Proterozoic that were followed by separation of Laurentia from another landmass, probably Australia. The oldest magmatic event produced the Bonnet Plume River Intrusions (BPRI), which intruded the Wernecke Supergroup as short dikes and small stocks. The BPRI are hydrothermally altered tholeiitic diorites, gabbros, and subordinate anorthositic and syenitic rocks, with trace element signatures consistent with a rift origin. Depleted mantle model ages range from 2.29 to 2.57 Ga and eNd values range from +0.7 to -1.7. An increasing crustal component is apparent in rocks with more evolved compositions. Four U-Pb zircon ages (1705.9 +- 0.7, 1709.4 +- 1.4, 1711.1 +- 5.1, and 1713.6 +- 12.7 Ma) indicate a Paleoproterozoic age for the BPRI. These dates constrain the age of the Wernecke Supergroup to >= ca. 1710 Ma, making it the oldest supracrustal succession in western Laurentia, e.g., >240 Ma older than the Belt Supergroup of southeastern British Columbia and the northwestern United States. The Wernecke Supergroup was deposited in the first rift basin to open along the western margin of Laurentia, but was later inverted by the pre-1.6 Ga Racklan Orogeny, an event possibly influenced by transmission of compression from the Yavapai and Mazatzal orogenies in southern Laurentia. The Neoproterozoic southwestern United States - east Antarctica (SWEAT) reconstruction, which places Australia next to northwestern Laurentia, is supported by linkages between Paleoproterozoic and Mesoproterozoic geological features in northwestern Canada and Australia." name="eprints.abstract" />
<meta content="2001-10" name="eprints.date" />
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<meta content="Thorkelson, D.J. and Mortensen, J.K. and Creaser, R.A. and Davidson, G.J. and Abbott, J.G. (2001) Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia. Canadian Journal of Earth Science, 38 (10). pp. 1479-1494." name="eprints.citation" />
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<meta content="Creaser, R.A." name="DC.creator" />
<meta content="Davidson, G.J." name="DC.creator" />
<meta content="Abbott, J.G." name="DC.creator" />
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<meta content="Northwestern Laurentia, after cratonization at about 1.85 Ga, underwent a series of tectonic and magmatic events during the Proterozoic that were followed by separation of Laurentia from another landmass, probably Australia. The oldest magmatic event produced the Bonnet Plume River Intrusions (BPRI), which intruded the Wernecke Supergroup as short dikes and small stocks. The BPRI are hydrothermally altered tholeiitic diorites, gabbros, and subordinate anorthositic and syenitic rocks, with trace element signatures consistent with a rift origin. Depleted mantle model ages range from 2.29 to 2.57 Ga and eNd values range from +0.7 to -1.7. An increasing crustal component is apparent in rocks with more evolved compositions. Four U-Pb zircon ages (1705.9 +- 0.7, 1709.4 +- 1.4, 1711.1 +- 5.1, and 1713.6 +- 12.7 Ma) indicate a Paleoproterozoic age for the BPRI. These dates constrain the age of the Wernecke Supergroup to >= ca. 1710 Ma, making it the oldest supracrustal succession in western Laurentia, e.g., >240 Ma older than the Belt Supergroup of southeastern British Columbia and the northwestern United States. The Wernecke Supergroup was deposited in the first rift basin to open along the western margin of Laurentia, but was later inverted by the pre-1.6 Ga Racklan Orogeny, an event possibly influenced by transmission of compression from the Yavapai and Mazatzal orogenies in southern Laurentia. The Neoproterozoic southwestern United States - east Antarctica (SWEAT) reconstruction, which places Australia next to northwestern Laurentia, is supported by linkages between Paleoproterozoic and Mesoproterozoic geological features in northwestern Canada and Australia." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Thorkelson, D.J.</span> and <span class="person_name">Mortensen, J.K.</span> and <span class="person_name">Creaser, R.A.</span> and <span class="person_name">Davidson, G.J.</span> and <span class="person_name">Abbott, J.G.</span> (2001) <xhtml:em>Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia.</xhtml:em> Canadian Journal of Earth Science, 38 (10). pp. 1479-1494.</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_769' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_769' );" href="http://eprints.utas.edu.au/761/1/cjes_Thorkelson_etal.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_769"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/761/thumbnails/1/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/761/1/cjes_Thorkelson_etal.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />2241Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1139/cjes-38-10-1479">http://dx.doi.org/10.1139/cjes-38-10-1479</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Northwestern Laurentia, after cratonization at about 1.85 Ga, underwent a series of tectonic and magmatic events during the Proterozoic that were followed by separation of Laurentia from another landmass, probably Australia. The oldest magmatic event produced the Bonnet Plume River Intrusions (BPRI), which intruded the Wernecke Supergroup as short dikes and small stocks. The BPRI are hydrothermally altered tholeiitic diorites, gabbros, and subordinate anorthositic and syenitic rocks, with trace element signatures consistent with a rift origin. Depleted mantle model ages range from 2.29 to 2.57 Ga and eNd values range from +0.7 to -1.7. An increasing crustal component is apparent in rocks with more evolved compositions. Four U-Pb zircon ages (1705.9 +- 0.7, 1709.4 +- 1.4, 1711.1 +- 5.1, and 1713.6 +- 12.7 Ma) indicate a Paleoproterozoic age for the BPRI. These dates constrain the age of the Wernecke Supergroup to >= ca. 1710 Ma, making it the oldest supracrustal succession in western Laurentia, e.g., >240 Ma older than the Belt Supergroup of southeastern British Columbia and the northwestern United States. The Wernecke Supergroup was deposited in the first rift basin to open along the western margin of Laurentia, but was later inverted by the pre-1.6 Ga Racklan Orogeny, an event possibly influenced by transmission of compression from the Yavapai and Mazatzal orogenies in southern Laurentia. The Neoproterozoic southwestern United States - east Antarctica (SWEAT) reconstruction, which places Australia next to northwestern Laurentia, is supported by linkages between Paleoproterozoic and Mesoproterozoic geological features in northwestern Canada and Australia.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><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_vols_e?cjes</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">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">761</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">Mr Ruben Chan</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">01 Mar 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">23 Jan 2008 15:50</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=761;">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=761">item control page</a></p>
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