File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Constraints on the timing of crustal imbrication in the central Trans-Hudson Orogen from single zircon 207Pb/206Pb ages of granitoid rocks from the Pelican thrust zone, Saskatchewan

TitleConstraints on the timing of crustal imbrication in the central Trans-Hudson Orogen from single zircon 207Pb/206Pb ages of granitoid rocks from the Pelican thrust zone, Saskatchewan
Authors
Issue Date1996
PublisherN R C Research Press. The Journal's web site is located at http://www.nrc.ca/cgi-bin/cisti/journals/rp/rp2_desc_e?cjes
Citation
Canadian Journal Of Earth Sciences, 1996, v. 33 n. 12, p. 1638-1647 How to Cite?
AbstractThe Pelican thrust is a major ductile high-strain zone in the Reindeer Zone, Trans-Hudson Orogen, northern Saskatchewan. It is interpreted as the main sole thrust separating stacked juvenile Paleoproterozoic allochthons and underlying Archean microcontinental crust in this central part of the orogen. Exposed nonmylonitic rocks in the footwall of the thrust consist of the Sahli monzocharnockite and the smaller, more highly retrograded MacMillan Point granite. Protomylonitic to ultramylonitic gneisses in the thrust zone derive from a variety of prethrust protoliths. A footwall "internal suite" mainly comprises quartzofeldspathic orthogneisses ("Q" gneisses) and high-grade migmatitic paragneisses. Hanging-wall "external suite" mylonitic gneisses include feldspar-porphyroclastic hornblendic grey gneisses probably derived from arc plutons, and laminated amphibolites derived from volcanic rocks. The overlying allochthon mainly comprises protoliths equivalent to those of the porphyroclastic orthogneisses and laminated amphibolites, together with interfolded and overlying Paleoproterozoic paragneisses of the Kisseynew domain. The Sahli monzocharnockite yields 207Pb/206Pb zircon and whole-rock Rb-Sr ages of ca. 2500 Ma, and the "Q" gneisses give 207Pb/206Pb zircon ages of up to ca. 2900 Ma, implying that most of the internal suite (footwall) mylonite protoliths are Archean. In contrast, external suite (hanging wall) porphyroclastic orthogneisses yield ca. 1880-1840 Ma 207Pb/206Pb zircon ages. Main, peak-metamorphic displacement on the Pelican thrust is interpreted to have occurred mainly between 1840 and 1820 Ma, as indicated by 207Pb/206Pb zircon ages from small, highly deformed synthrusting granite-pegmatite neosomal bodies in the thrust zone. Undeformed postcollisional granites and pegmatites were emplaced ∼1789 Ma. Total duration from arc development to completion of arc-continent collision was ∼100 Ma. The Pelican thrust zone may be similar in significance and style to younger, major, ocean closure related thrusts such as the Frontal Pennine thrust of the western Alps and the Main Mantle, Main Boundary, and Main Central thrusts of the Himalayas. As for the Pelican thrust, these displace oceanic rocks over older basement.
Persistent Identifierhttp://hdl.handle.net/10722/42376
ISSN
2015 Impact Factor: 1.19
2015 SCImago Journal Rankings: 0.811
References

 

DC FieldValueLanguage
dc.contributor.authorSun, Men_HK
dc.contributor.authorKyser, Ken_HK
dc.contributor.authorStauffer, Men_HK
dc.contributor.authorKerrich, Ren_HK
dc.contributor.authorLewry, Jen_HK
dc.date.accessioned2007-01-29T08:48:16Z-
dc.date.available2007-01-29T08:48:16Z-
dc.date.issued1996en_HK
dc.identifier.citationCanadian Journal Of Earth Sciences, 1996, v. 33 n. 12, p. 1638-1647en_HK
dc.identifier.issn0008-4077en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42376-
dc.description.abstractThe Pelican thrust is a major ductile high-strain zone in the Reindeer Zone, Trans-Hudson Orogen, northern Saskatchewan. It is interpreted as the main sole thrust separating stacked juvenile Paleoproterozoic allochthons and underlying Archean microcontinental crust in this central part of the orogen. Exposed nonmylonitic rocks in the footwall of the thrust consist of the Sahli monzocharnockite and the smaller, more highly retrograded MacMillan Point granite. Protomylonitic to ultramylonitic gneisses in the thrust zone derive from a variety of prethrust protoliths. A footwall "internal suite" mainly comprises quartzofeldspathic orthogneisses ("Q" gneisses) and high-grade migmatitic paragneisses. Hanging-wall "external suite" mylonitic gneisses include feldspar-porphyroclastic hornblendic grey gneisses probably derived from arc plutons, and laminated amphibolites derived from volcanic rocks. The overlying allochthon mainly comprises protoliths equivalent to those of the porphyroclastic orthogneisses and laminated amphibolites, together with interfolded and overlying Paleoproterozoic paragneisses of the Kisseynew domain. The Sahli monzocharnockite yields 207Pb/206Pb zircon and whole-rock Rb-Sr ages of ca. 2500 Ma, and the "Q" gneisses give 207Pb/206Pb zircon ages of up to ca. 2900 Ma, implying that most of the internal suite (footwall) mylonite protoliths are Archean. In contrast, external suite (hanging wall) porphyroclastic orthogneisses yield ca. 1880-1840 Ma 207Pb/206Pb zircon ages. Main, peak-metamorphic displacement on the Pelican thrust is interpreted to have occurred mainly between 1840 and 1820 Ma, as indicated by 207Pb/206Pb zircon ages from small, highly deformed synthrusting granite-pegmatite neosomal bodies in the thrust zone. Undeformed postcollisional granites and pegmatites were emplaced ∼1789 Ma. Total duration from arc development to completion of arc-continent collision was ∼100 Ma. The Pelican thrust zone may be similar in significance and style to younger, major, ocean closure related thrusts such as the Frontal Pennine thrust of the western Alps and the Main Mantle, Main Boundary, and Main Central thrusts of the Himalayas. As for the Pelican thrust, these displace oceanic rocks over older basement.en_HK
dc.format.extent1030440 bytes-
dc.format.extent25600 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherN R C Research Press. The Journal's web site is located at http://www.nrc.ca/cgi-bin/cisti/journals/rp/rp2_desc_e?cjesen_HK
dc.relation.ispartofCanadian Journal of Earth Sciencesen_HK
dc.rightsCanadian Journal of Earth Sciences. Copyright © N R C Research Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleConstraints on the timing of crustal imbrication in the central Trans-Hudson Orogen from single zircon 207Pb/206Pb ages of granitoid rocks from the Pelican thrust zone, Saskatchewanen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0008-4077&volume=33&spage=1638&epage=1647&date=1996&atitle=Constraints+on+the+timing+of+crustal+imbrication+in+the+central+Trans-Hudson+orogen+from+single+zircon+207Pb/206Pb+ages+of+granitoid+rocks+from+the+Pelican+thrust+zone,+Saskatchewanen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.scopuseid_2-s2.0-0030427987en_HK
dc.identifier.hkuros23240-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030427987&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue12en_HK
dc.identifier.spage1638en_HK
dc.identifier.epage1647en_HK
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridKyser, K=6603346992en_HK
dc.identifier.scopusauthoridStauffer, M=7005319447en_HK
dc.identifier.scopusauthoridKerrich, R=7005649319en_HK
dc.identifier.scopusauthoridLewry, J=6701733774en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats