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TitleEvolution of the early Paleozoic Cordilleran margin of Laurentia: tectonic and eustatic events interpreted from sequence stratigraphy and conodont community patterns
AuthorZhang, S; Pyle, L J; Barnes, C R
SourceThe Grenville Province: a geological and mineral resources perspective derived from government and academic research initiatives/La Province de Grenville : l'aspect des ressources géologiques et minérales découlant des initiatives de recherche gouvernementales et académiques; by Cook, F A (ed.); Erdmer, P (ed.); Canadian Journal of Earth Sciences vol. 42, no. 6, 2005 p. 999-1031, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 2005712
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
ProvinceAlberta; British Columbia; Yukon; Northwest Territories
NTS82; 83; 84; 85; 92H; 92I; 92J; 92O; 92P; 93A; 93B; 93F; 93G; 93H; 93I; 93J; 93K; 93M; 93N; 93O; 93P; 94; 95; 104A; 104H; 104I; 104J; 104N; 104O; 104P; 105; 115H; 115I; 115J; 115O; 115P
AreaCanadian Cordillera
Lat/Long WENS-140.0000 -112.0000 65.0000 50.0000
Subjectspaleontology; stratigraphy; tectonics; conodonts; faunal studies; faunal distribution; continental margins; tectonic history; tectonic evolution; sea level changes; biostratigraphy; taxonomy; statistical analyses; cluster analyses; sedimentary rocks; igneous rocks; volcanic rocks; intrusive rocks; paleoecology; systematic stratigraphy; transgressions; regressions; subsidence; Tremadocian; Arenigian; Caradocian; Ashgillian; Llandoverian; Canadian Cordillera; Laurentia; Cordilleran-Laurentian Margin; White River Trough; Kechika Trough; Robson Trough; Bow Platform; Cassiar Platform; Macdonald Platform; Kakwa Platform; Blackwater Platform; Misty Creek Embayment; Meilleur River Embayment; Ospika Embayment; Northern Rocky Mountain-Tintina Fault; Nasina Basin; Selwyn Basin; Root Basin; Williston Basin; Peace River Arch; Fort Nelson High; Muskwa High; Iapetognathus; Rossodus; Drepanoistodus; Scolopodus; Acodus; Oepikodus; Jumudontus; Tripodus; Paroistodus; platform facies; basin facies; databases; extension; shelfbreak; basin foundering; tectonic highs; Darriwilian; Phanerozoic; Paleozoic; Silurian; Ordovician; Cambrian
Illustrationssketch maps; stratigraphic charts; statistical outputs; biostratigraphic charts; geochronological charts; tables
ProgramLithoprobe Slave-Northern Cordillera Lithospheric Evolution Transect (SNORCLE)
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramIndian and Northern Affairs Canada, Northern Scientific Training Program
ProgramCanadian Institute for Advanced Research, Earth System Evolution
AbstractSeveral field seasons in the Canadian Cordillera have allowed the measurement, description and sampling of over 20 000 m of lower Paleozoic strata from 26 stratigraphic sections across four platform-to-basin transects, with the recovery of over 100 000 conodonts from more than 1200 4-5 kg samples. This work was part of the Lithoprobe Slave-Northern Cordillera Lithospheric Evolution (SNORCLE) project but is also being extended through a Pan-Lithoprobe project to understand the tectonic and eustatic response of much of the Laurentian plate through the early Paleozoic. Based on the abundant field data, the complex stratigraphic framework is interpreted in terms of sequence stratigraphy and a derived relative sea-level curve. Using detailed conodont taxonomic and biostratigraphic results, cluster analysis of conodont distributional data identified an evolving series of conodont communities through space and time. These communities were partitioned across the platform-to-basin gradient and provide an additional sensitive indicator of relative sea-level change. These two independent approaches generated comparable eustatic curves for this Cordilleran Laurentian margin during much of the early Paleozoic and identified some global eustatic events noted by earlier workers. This part of Laurentia was not a simple passive margin during the early Paleozoic, but rather was affected by four main tectonic events complicated by six principal eustatic changes. Some success was achieved in filtering the global and regional tectonic-eustatic effects and in proposing causes for some of the events.