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2. Introduction to the Special issue of the Canadian Journal of Earth Sciences, "Magmatic and metallogenic processes associated with large igneous provinces".
- Author
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Williamson, Marie-Claude and Saumur, Benoit M.
- Subjects
IGNEOUS provinces ,EARTH sciences ,MINES & mineral resources ,IGNEOUS rocks ,GEOCHEMISTRY ,PETROLOGY - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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3. Introduction to the Grenville Province: a geological and mineral resources perspective derived from government and academic research initiatives.
- Author
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Corriveau, Louise and Clark, Thomas
- Subjects
MINES & mineral resources ,METALS ,MINERALS ,PRECIOUS metals ,MINING camps ,EARTH sciences ,GEOLOGY ,MINERALOGY ,ORE deposits - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2005
- Full Text
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4. The Potsdam–Beekmantown Group boundary, Nepean Formation type section (Ottawa, Ontario): a cryptic sequence boundary, not a conformable transition.
- Author
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Dix, George R., Hersi, Osman Salad, and Nowlan, Godfrey S.
- Subjects
SEDIMENTATION & deposition ,GEOLOGY ,CAMBRIAN paleoecology ,EARTH sciences - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2004
- Full Text
- View/download PDF
5. Late Wisconsinan stratigraphy and chronology of southern St. George's Bay, Newfoundland: a re-appraisal: Reply.
- Author
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Bell, Trevor, Liverman, David G.E, Batterson, Martin J, and Sheppard, Kevin
- Subjects
EVENT stratigraphy ,EARTH sciences ,PERIODICALS ,GEOLOGY - Abstract
Presents a reply to the comment given by I. Brookes to the article "Late Wisconsinan stratigraphy and chronology of southern St. George's Bay, Newfoundland: a re-appraisal," by Trevor Bell, David G.E. Liverman, Martin J. Batterson and Kevin Sheppard, which appeared in the 2001 issue of the 'Canadian Journal of Earth Sciences." Disagreements in field observations and interpretations; Discussion of a complex sedimentary sequences of interbedded diamicton, gravel and mud above the basal till; Discounting the significance of a date given to a diamicton at Highlands.
- Published
- 2002
- Full Text
- View/download PDF
6. Introduction to special issue of Canadian Journal of Earth Sciences: the Alberta Basement Transect of Lithoprobe.
- Author
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Ross, Gerald M
- Subjects
PERIODICALS ,EARTH sciences ,ENVIRONMENTAL sciences ,SCIENCE - Abstract
Introduces a series of articles featured in the special issue of the "Canadian Journal of Earth Sciences." Discussion of articles on the final compendium of papers on the Alberta Basement Transect of Lithoprobe.
- Published
- 2002
- Full Text
- View/download PDF
7. Structural analysis of the Miniss River and related faults, western Superior Province: post-collisional displacement initiated at terrane boundaries.
- Author
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Bethune, K. M., Helmstaedt, H. H., and McNicoll, V. J.
- Subjects
RIVERS ,GEOLOGIC faults ,STRUCTURAL geology ,CANADIAN provinces ,GEOLOGICAL time scales ,HISTORICAL geology ,GEOLOGY ,EARTH sciences - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2006
- Full Text
- View/download PDF
8. John Tuzo Wilson: a man who moved mountains1.
- Author
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West, Gordon F., Farquhar, Ron M., Garland, George D., Halls, Henry C., Morley, Lawrence W., and Russell, R. Don
- Subjects
GEOPHYSICISTS ,SCIENTISTS ,EARTH scientists ,EARTH sciences ,PLATE tectonics - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
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9. Tuzo Wilson and the acceptance of pre-Mesozoic continental drift1.
- Author
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Hoffman, Paul F.
- Subjects
GEOPHYSICISTS ,CONTINENTAL drift ,EARTH sciences ,PLATE tectonics ,CENOZOIC Era ,PALEOMAGNETISM - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
10. John Tuzo Wilson: a Canadian who revolutionized Earth Sciences1.
- Author
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Polat, Ali
- Subjects
- *
SCIENTISTS , *EARTH sciences , *PLATE tectonics , *CONTINENTAL drift - Abstract
John Tuzo Wilson (1908-1993) was one of the greatest Canadian scientists of the 20th century. His contributions to Earth Sciences, leading the formulation of the theory of plate tectonics, have revolutionized our understanding of how the planet Earth works and evolved over the past 4 billion years. This 50th anniversary special issue of the Canadian Journal of Earth Sciences is dedicated in honour of John Tuzo Wilson, who inspired tens of thousands of students all around the world to study the Earth. This special issue contains 12 papers dealing with various aspects of the 'Wilson Cycle' in the geologic record, plate tectonics, mantle plumes, and how John Tuzo Wilson accepted 'continental drift' and formulated the theory of plate tectonics. The contributions have mostly been made by geoscientists who directly or indirectly associated with John Tuzo Wilson and have contributed significantly to the plate tectonics paradigm. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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11. The Frasnian-Famennian (mid-Late Devonian) boundary in the type section of the Long Rapids Formation, James Bay Lowlands, northern Ontario, Canada.
- Author
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Levman, Bryan G and Bitter, Peter H von
- Subjects
DEVONIAN paleoecology ,DEVONIAN stratigraphic geology ,GEOLOGY ,EARTH sciences - Abstract
Utilizing a combination of conodont-based biostratigraphy and geochemistry, the Frasnian–Famennian (F/F, mid-Late Devonian) boundary was located in the Long Rapids Formation, northern Ontario. It is present in a black shale sequence, 21.46 m above the base of the Long Rapids Formation, just above a carbonate bed that has similarities to the Upper Kellwasser Limestone, recognized as a lithological marker for the F/F boundary in Germany, Belgium, and France. There is no evidence of an impact event, and sedimentation across the boundary is continuous, although there is a discontinuity layer just below the boundary and the early part of the linguiformis Zone (of the standard Late Devonian conodont zonation) is missing. Strong positive δ [sup 13] C (organic and carbonate) values were identified and are interpreted as evidence of mass mortality in anoxic waters at the F/F extinction; positive δ[sup 18] O values suggest the extinction was also accompanied by a temperature drop. Negative δ[sup 34] S values also indicate anoxia, and negative δ[sup 15] N values provide evidence of reduced surface-water productivity. No iridium anomaly was found at the boundary, although higher than usual values were found about 85 cm below the F/F boundary. Sedimentological and biological evidence in the Long Rapids Formation indicates that the F/F extinction was coincident with major sea-level fluctuations in the late Frasnian, including a transgression beginning at the end of the linguiformis Zone and continuing through the Early triangularis Zone and beyond. Marine oscillations were accompanied by anoxia, which appears to be the killing mechanism for the conodont and other end Frasnian extinctions.La limite Frasnien–Famennien (F/F, Dévonien tardif moyen) a été localisée dans la Formation de Long Rapids, au nord de l'Ontario, en utilisant une combinaison de géochimie et de biostratigraphie basée sur les conodontes. Elle se trouve dans une séquence de shale noir, environ 21,46 m au-dessus de la base de la Formation de Long Rapids, juste au-dessus d'un lit de calcaire qui ressemble en bien des points au calcaire Kellwasser supérieur, lequel est reconnu comme un horizon repère lithologique pour la limite F/F en Allemagne, en Belgique et en France. Il n'y a pas d'évidence d'un événement d'impact et la sédimentation est continue à travers la limite, bien qu'il y ait une couche de discontinuité tout juste en dessous de la limite et que la partie précoce de la Zone à linguiformis (de la zonation standard pour les conodontes au Dévonien tardif) soit absente. Des valeurs fortement positives δ[sup 13] C (matières organiques et carbonates) ont été identifiées et elles sont interprétées comme évidence d'une mortalité de masse dans des eaux anoxiques à l'extinction F/F; des valeurs δ[sup 18] O positives portent à croire que l'extinction était accompagnée d'une chute de température. Des valeurs δ[sup 34] S négatives indiquent aussi l'anoxie et des valeurs δ[sup 15] N négatives fournissent des évidences de productivité réduite à la surface de l'eau. Aucune anomalie d'iridium n'a été trouvée à la limite, bien que des valeurs plus élevées que d'habitude aient été trouvées à environ 85 cm sous la limite F/F. Des évidences sédimentologiques et biologiques dans la Formation de Long Rapids indiquent que l'extinction F/F a coïncidé avec de grandes fluctuations du niveau de la mer au Frasnien tardif, incluant une transgression qui a débuté à la fin de la Zone à linguiformis et qui s'est poursuivie à travers et au-delà de la Zone à triangularis précoce. Les oscillations marines étaient accompagnées d'anoxie ce qui semble être le mécanisme qui ait tué les conodontes et celui responsable d'autres extinctions à la fin du Frasnien. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
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12. Early Turonian (Late Cretaceous) age of the Tuskoola sandstone Pine River area, northeastern British Columbia.
- Author
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Stelck, C R, Moore, W E, and Pemberton, S G
- Subjects
CRETACEOUS paleoceanography ,CRETACEOUS paleoecology ,CRETACEOUS stratigraphic geology ,RIVERS ,SANDSTONE ,EARTH sciences - Abstract
The presence of Watinoceras reesidei Warren, Watinoceras coloradoense (Henderson), Watinoceras thompsonense Cobban, and Mytiloides mytiloides (Mantell) within the Tuskoola sandstone beds of the Vimy Member of the Kaskapau (Blackstone) Formation, places these strata within the lower Turonian stage of the Upper Cretaceous, within the Watinoceras reesidei Zone. International discoveries of Watinoceras in the United States, the Arctic, west Africa, northern Africa, Europe, and Asia, in the past fifty years has allowed the authors, while updating the stratigraphy and taxonomy, to refine correlation of the Tuskoola sandstone, a sandy facies of the "Second White Specks" horizon of Western Canada.La présence de Watinoceras reesidei Warren, Watinoceras coloradoense (Henderson), Watinoceras thompsonense Cobban et Mytiloides mytiloides (Mantell) dans les lits de grès de Tuskoola du membre Vimy de la Formation de Kaskapau (Blackstone), place ces strates à l'étage Turonien inférieur du Crétacé supérieur, à l'intérieur de la zone à Watinoceras reesidei. Des découvertes internationales de Watinoceras aux États-Unis, dans l'Arctique, en Afrique occidentale, en Afrique du Nord, en Europe et en Asie au cours des cinquante dernières années ont permis aux auteurs, tout en mettant à jour la stratigraphie et la taxonomie, de préciser la corrélation du grès de Tuskoola, un faciès gréseux de l'horizon « Second White Specks » de l'Ouest du Canada.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
13. Evolution of 3.1 and 3.0 Ga volcanic belts and a new thermotectonic model for the Hopedale Block, North Atlantic craton (Canada).
- Author
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James, D T, Kamo, S, and Krogh, T
- Subjects
GALLIUM ,GEOCHEMISTRY ,EARTH sciences ,LEAD compounds - Abstract
A new model for evolution of the Archean Hopedale Block, based on mapping and supporting U–Pb geochronological and geochemical studies, is highlighted by (i) ca. 3.25 Ga emplacement of igneous precursors of Maggo Gneiss; (ii) >3.1 Ga, high-grade Hopedalian metamorphism and attendant deformation; (iii) emplacement of the Hopedale mafic dykes; (iv) 3.1 Ga deposition of Hunt River volcanic rocks; (v) ca. 3.0 Ga deposition of Florence Lake volcanic rocks; (vi) 2.88–2.96 Ga, greenschist- to amphibolite-facies Fiordian metamorphism and formation of penetrative, northeast-striking Fiordian structures; and (vii) emplacement of a suite of 2.89–2.83 Ga tonalite to granite intrusions, which partially overlap and locally postdate Fiordian metamorphism and deformation. The Hunt River and Florence Lake volcanic sequences are different in age but similar in most other respects. The former consists mainly of amphibolite-facies mafic metavolcanic rocks and lesser amounts of komatiite flows and metasedimentary and 3105 ± 3 Ma felsic volcanic rocks. The Florence Lake volcanic belt consists mainly of greenschist- to amphibolite-facies mafic metavolcanic rocks, lesser amounts of felsic metavolcanic rocks, dated at 2979 ± 1 and 2990 ± 2 Ma, komatiite flows, and rare metasedimentary rocks. The similarity of rock types, field relationships between different rock types, such as the common association of ultramafic and felsic metavolcanic rocks, and the chemistry of volcanic rocks in both belts suggest a common tectonic setting for each belt. A model involving episodic volcanism, separated by 100 Ma, in ensialic basins is consistent with the dominance of tholeiitic basalt and an abundance of pre-volcanic basement.Un nouveau modèle pour l'évolution du bloc Hopedale (Archéen), basé sur la cartographie et supportant les études sur la géochronologie et la géochimie U–Pb, est mis en évidence par (i) la mise en place vers 3,25 Ga des précurseurs ignés du gneiss Maggo, (ii) le métamorphisme élevé de Hopedale, vers 3,1 Ga, et la déformation qui l'accompagne (iii) la mise en place des dykes mafiques Hopedale, (iv) la déposition à 3,1 Ga des roches volcaniques de Hunt River, (v) la déposition vers 3,0 Ga des roches volcaniques de Florence Lake, (vi) le métamorphisme fiordien, du faciès de schistes verts au faciès des amphibolites, et la formation de structures fiordiennes pénétrantes et de direction nord-est, de 2,88 à 2,96 Ga et (vii) la mise en place d'une suite d'intrusions de tonalite à granite, 2,89 à 2,83 Ga; ces intrusions recouvrent en partie le métamorphisme et la déformation fioridiens et, par endroits, elles leur sont plus tardives. Les séquences volcaniques de Hunt River et de Florence Lake sont d'âges différents mais elles sont similaires selon la plupart des autres aspects. La séquence de Hunt River consiste surtout en roches volcaniques mafiques au faciès des amphibolites avec moins de coulées komatiitiques, des roches métasédimentaires et des roches volcaniques âgées de 3105 ± 3 Ma. La ceinture volcanique de Florence Lake comprend surtout des roches métavolcaniques mafiques du faciès des schistes verts au faciès des amphibolites et des quantités moindres de roches métavolcaniques felsiques âgées de 2979 ± 1 et 2990 ± 2 Ma, des coulées komatiitiques et de rares roches métasédimentaires. La similitude des types de roches, les relations de terrain entre les divers types de roches, telles que l'association fréquente des roches métavolcaniques ultramafiques et felsiques, ainsi que la chimie des roches volcaniques dans les deux ceintures suggèrent un contexte tectonique commun. Un modèle impliquant des épisodes de volcanisme, séparés par 100 Ma, dans des bassins ensialiques concorde avec la dominance de basalte tholéiitique et une abondance de socle prévolcanique.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
14. The southeastern Churchill Province: synthesis of a Paleoproterozoic transpressional orogen.
- Author
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Wardle, Richard J, James, Donald T, Scott, David J, and Hall, Jeremy
- Subjects
GEOLOGY ,NATURAL history ,EARTH sciences ,NORD-du-Quebec (Quebec) - Abstract
The Paleoproterozoic southeastern Churchill Province (SECP) is located in the northeastern Canadian Shield of Labrador and Quebec. The SECP formed through the oblique collisions of the Archean Nain and Superior cratons with a third intervening Archean block, the core zone. The belt has a tripartite structure, comprising the Torngat Orogen (TO) formed by Nain craton – core zone collision in the east, the core zone in the centre, and the New Quebec Orogen (NQO) formed by Superior craton – core zone collision in the west. The SECP thus records transpressional development on the flanks of the Superior and Nain cratons as they indented northwards to form the larger Trans-Hudson – Nagssugtoqidian orogenic belt to the north. Principal stages of tectonic development were (1) 2.2–2.1 Ga crustal rifting of Nain and Superior cratons; (2) ca. 1.9 Ga subduction under eastern Nain craton; (3) ca. 1.87–1.85 Ga collision of Nain craton and core zone to form the TO; (4) 1.845–1.820 Ga sinistral transpression in the TO, and subduction under the western core zone; and (5) 1.82–1.77 Ga collision of Superior craton and core zone to form the NQO, in association with dextral transpression. Crustal-scale cross sections of the SECP have been developed from reflection and refraction seismic data. The western part of the NQO is dominantly west-vergent and associated with an imbricate thick-skinned thrust stack that ramps from the base of the crust. The core zone is characterized by a 35–40 km thick crust and pervasive east-dipping fabrics related to westerly thrusting. The TO is a narrow, doubly vergent belt, associated with a 48 km thick crust that forms a crustal root with a Moho relief of 12 km. The root is interpreted to result from attempted subduction of the core zone under the Nain craton, possibly as a result of mid-crustal wedging by the Nain craton. The TO was the site of intense convergence that resulted in excision of juvenile crust, possibly including tectonic removal of the axial magmatic arc. As a result, the middle to lower levels of the SECP consist largely of refractory Archean lithosphere. This may account for the lack of widespread post-collisional plutonism in the SECP and the preservation of the TO root.Le sud-est de la Province de Churchill (SECP, Southeastern Churchill Province; Paléoprotérozoïque) est situé dans le nord-est du Bouclier canadien, au Labrador et au Québec. Le SECP a été formé par des collisions obliques entre les cratons archéens de Nain et du Supérieur et un troisième bloc archéen intermédiaire, la zone noyau. La ceinture a une structure tripartite, comprenant l'orogène Torngat (TO), formé par la collision entre la zone noyau et le craton de Nain, à l'est, la zone noyau au centre et l'orogène du Nouveau-Québec (NQO), formé par la collision entre la zone noyau et le craton du Supérieur, à l'ouest. Le SECP enregistre donc le développement de transpressions sur les flancs des cratons de Nain et du Supérieur alors que ces derniers se déplaçaient vers le nord pour former la grande ceinture orogénique trans-hudsonienne – nagssugtoqidienne au nord. Les principaux stages de développement tectonique ont été : (1) la dérive crustale des cratons de Nain et du Supérieur, 2,2–2,1 Ga; (2) la subduction sous le craton de Nain oriental, vers 1,9 Ga; (3) la collision entre le craton de Nain et la zone noyau pour former l'orogène Torngat, vers 1,87–1,85 Ga; (4) la transpression senestre dans TO, 1,845–1,82 Ga; la subduction sous la zone noyau occidentale; (5) la collision entre le craton du Supérieur et la zone noyau pour former l'orogène du Nouveau-Québec, associée à de la transpression dextre, 1,82–1,77 Ga. Des coupes à l'échelle crustale du SECP ont été produites à partir de données de sismique réflexion et réfraction. La partie ouest de l'orogène du Nouveau-Québec est déversée surtout vers l'ouest et associée à une épaisse structure imbriquée de chevauchement qui remonte à partir de la base de la croûte. La zone noyau est caractérisée par une croûte dont l'épaisseur est de 35–40 km et des textures pénétrantes à pendage vers l'est qui sont reliées à du chevauchement vers l'ouest. L'orogène Torngat est une ceinture étroite à double vergence, associée à une croûte épaisse de 48 km qui forme une racine crustale avec un relief du Moho de 12 km. On interprète la racine comme une tentative de subduction de la zone noyau sous le craton de Nain, possiblement à la suite d'un coincement mi-crustal par le craton de Nain. L'orogène Torngat a été le site d'une intense convergence qui a eu comme résultat d'exciser la croûte juvénile, possiblement avec le retrait tectonique de l'arc magmatique axial. Il en a résulté que les niveaux mi-inférieurs du SECP consistent surtout de lithosphère archéenne réfractaire. Cela pourrait expliquer le manque de plutonisme post-collisionnel étendu dans le SECP et la préservation de la racine de l'orogène Torngat.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
15. Nature of the basement to Quesnel Terrane near Christina Lake, southeastern British Columbia.
- Author
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Acton, S L, Simony, P S, and Heaman, L M
- Subjects
PALEOZOIC stratigraphic geology ,GEOLOGY ,EARTH sciences - Abstract
The character of the Paleozoic basement of Quesnel Terrane and the position of the terrane accretion surface that separates Quesnel and Kootenay terranes from rocks of the ancient North American margin are subjects of debate. To address these problems, detailed mapping and U–Pb geochronologic studies were carried out in the Christina Lake area to define the relationship of the Mollie Creek assemblage, Josh Creek diorite, and Fife diorite to similar lithologies in the Greenwood – Grand Forks and Rossland regions, and to place limits on the ages of regional deformation and local position of the terrane accretion surface. Deformed metasedimentary rocks of the Mollie Creek assemblage may correlate with sedimentary rocks of the Pennsylvanian to Early Triassic Mount Roberts Formation in the Rossland area. The Mollie Creek assemblage is intruded by the foliated Late Triassic Josh Creek diorite. The Josh Creek diorite and Mollie Creek assemblage have been deformed together as a result of phase two deformation, following the intrusion of the Josh Creek diorite in the Late Triassic and prior to the intrusion of the Fife diorite and deposition of the overlying Rossland Group in the Early Jurassic. Based on relative age, structural position, and lithological similarities to other units within Quesnel Terrane, the Mollie Creek assemblage, Josh Creek diorite, and Fife diorite are a part of Quesnel Terrane and lie above the terrane accretion surface in the Christina Lake area. Therefore, Quesnel Terrane does not unconformably overlie basement rocks of known North American affinity in this region.Le caractère du socle paléozoïque du terrane de Quesnel et la position de la surface d'accrétion du terrane qui sépare les terranes de Quesnel et de Kootenay des roches de l'ancienne marge nord-américaine sont sujets à discussion. Afin d'aborder ces problèmes, de la cartographie de détail et des études géochronologiques U–Pb ont été entreprises dans la région du lac Christina afin de définir la relation entre l'assemblage de Mollie Creek, la diorite de Josh Creek, la diorite de Fife et des lithologies similaires dans les régions de Greenwood–Grand Forks et de Rossland et de circonscrire les âges de la déformation régionale ainsi que la position locale de la surface d'accrétion du terrane. Des roches métasédimentaires déformées de l'assemblage de Mollie Creek correspondent peut-être à des roches sédimentaires de la Formation de Mount Roberts (Pennsylvanien à Trias précoce) dans la région de Rossland. La diorite foliée de Josh Creek (Trias tardif) pénètre dans l'assemblage de Mollie Creek. La diorite de Josh Creek et l'assemblage de Mollie Creek ont été déformés ensemble à la suite d'une déformation de phase deux, après l'intrusion de la diorite de Josh Creek au Trias tardif et avant l'intrusion de la diorite de Fife et la déposition du Groupe de Rossland sus-jacent, au Jurassique précoce. Selon les âges relatifs, la position structurale et les similitudes lithologiques aux autres unités à l'intérieur du terrane de Quesnel, l'assemblage de Mollie Creek, la diorite de Josh Creek et la diorite de Fife font partie du terrane de Quesnel et reposent au-dessus de la surface d'accrétion du terrane dans la région du lac Christina. Le terrane de Quesnel ne repose donc pas en discordance sur les roches du socle d'affinité nord-américaine connue dans cette région.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
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16. New U–Pb age constraints on latest Cretaceous magmatism and associated mineralization in the Fawnie Range, Nechako Plateau, central British Columbia.
- Author
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Friedman, R M, Diakow, L J, Lane, R A, and Mortensen, J K
- Subjects
MAGMATISM ,GEOLOGY ,NATURAL history ,EARTH sciences - Abstract
New U–Pb ages and K–Ar dates, primarily for rocks proximal to mineral occurrences in the Fawnie Range of central British Columbia, document latest Cretaceous (ca. 74–66 Ma) continental-arc igneous activity and date associated base and precious metal mineralization. U–Pb ages of ca. 73–69 Ma for the Capoose pluton and hypabyssal to extrusive garnet rhyolites at the Capoose prospect demonstrate a latest Cretaceous age for mineralization and a likely plutonic source for mineralizing fluids. A U–Pb age of ca. 67 Ma for a late mineralized felsic dyke and two K–Ar dates (ca. 70 and 68 Ma) for hornfelsed Jurassic volcanic rocks at the Blackwater–Davidson prospect constrain a latest Cretaceous age for mineralization. A U–Pb age of ca. 74 Ma for a fine grained diorite sill that cuts a significant epithermal gold vein at the Tsacha prospect places a minimum age on mineralization at this probable Jura-Cretaceous deposit and documents latest Cretaceous magmatism. Latest Cretaceous K–Ar dates are reported for an andesite flow adjacent to the Eocene Holy Cross deposit (ca. 66 Ma), about 35 km north of the Fawnie Range, and a Kasalka Group rhyolite (ca. 68 Ma) exposed near the western margin of the Nechako Plateau. Latest Cretaceous magmatism and mineralization in the Fawnie Range represent the waning stages of Bulkley suite magmatism and porphyry-style mineralization, which was concentrated along the western margin of the Nechako Plateau at circa 88–70 Ma. The distribution of latest Cretaceous arc igneous rocks along the North American Cordilleran is reviewed and tectonic implications discussed.De nouveaux âges U–Pb et de nouvelles datations K–Ar, surtout pour des roches à proximité d'occurrences minérales dans la chaîne Fawnie du centre de la Colombie-Britannique documentent la plus récente activité ignée d'arc continental au Crétacé (ca. 74–66 Ma) et datent la minéralisation associée de métaux précieux et de métaux de base. Des âges U–Pb d'environ 73–69 Ma pour le pluton de Capoose et les rhyolites grenatifères hypabyssales à extrusives dans la zone d'intérêt Capoose démontrent un âge Crétacé terminal pour la minéralisation et une source plutonique probable pour les fluides minéralisateurs. Un âge U–Pb d'environ 67 Ma pour un dyke felsique à minéralisation tardive et deux datations K–Ar (ca. 70 et 68 Ma) pour des roches volcaniques au faciès des cornéennes, datant du Jurassique, à la zone d'intérêt Blackwater–Davidson limitent l'âge de la minéralisation au Crétacé terminal. Un âge U–Pb d'environ 74 Ma pour un filon-couche de diorite à grains fins qui recoupe une importante veine d'or épithermale à la zone d'intérêt Tsacha donne un âge minimum pour la minéralisation de ce dépôt, probablement au Jurassique–Crétacé, et documente le magmatisme au Crétacé terminal. Des datations K–Ar de Crétacé terminal sont rapportées pour un écoulement d'andésite adjacent au gisement de Holy Cross, datant de l'Éocène (ca. 66 MA), situé à environ 35 km au nord de la chaîne Fawnie et pour une rhyolite du Groupe de Kasalka (ca. 68 Ma) affleurant près de la bordure ouest du plateau Nechako. Du magmatisme et de la minéralisation dans la chaîne Fawnie, au Crétacé terminal, représentent les dernières phases du magmatisme de la suite Bulkley et de la minéralisation de type porphyrique, qui a été concentrée le long de la bordure ouest du plateau Nechako il y a environ 88–70 Ma. On passe en revue la distribution des roches ignées d'arc au Crétacé terminal le long de la Cordillère nord-américaine et on discute des implications tectoniques.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
17. Crustal structure of the metasedimentary Kisseynew domain and bounding volcanic–plutonic domains, Trans-Hudson orogen, Canada.
- Author
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Clowes, Ron M. and Roy, Baishali
- Subjects
EARTH sciences ,SCIENCE projects ,VOLCANIC soils - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2021
- Full Text
- View/download PDF
18. Correcting airborne gravity data for overburden thickness: a case study from the Nechako interior plateau, British Columbia1.
- Author
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Caron, Raymond M., Samson, Claire, Bates, Martin, and Chouteau, Michel
- Subjects
SHIELDS (Geology) ,RANDOM noise theory ,ELECTROMAGNETISM ,TOPOGRAPHY ,EARTH sciences - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
19. The electrical resistivity of Canada's lithosphere and correlation with other parameters: contributions from Lithoprobe and other programmes1.
- Author
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Jones, Alan G., Ledo, Juanjo, Ferguson, Ian J., Craven, James A., Unsworth, Martyn J., Chouteau, Michel, Spratt, Jessica E., and Enkin, Randolph
- Subjects
ELECTRICAL resistivity ,LITHOSPHERE ,MAGNETOTELLURICS ,EARTH sciences - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
20. The Paint Pots, Kootenay National Park, Canada - a natural acid spring analogue for Mars1,2.
- Author
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Grasby, Stephen E., Richards, Barry C., Sharp, Christine E., Brady, Allyson L., Jones, Gareth M., Dunfield, Peter F., and Williamson, Marie-Claude
- Subjects
GEOLOGY ,EARTH sciences ,MASS budget (Geophysics) ,NUMERICAL calculations ,CHEMICAL weathering - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
- View/download PDF
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