Precambrian K-Ar dates from the Western Canada Sedimentary Basin

Burwash, R. A.; Baadsgaard, H.; Peterman, Zell E.

doi:10.1029/jz067i004p01617

Cited by 68 publications

(25 citation statements)

References 11 publications

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“…This difference in field relationship may be resolved by invoking several episodes of post-Hudsonian diabase dike intrusion (Bunvash et al 1963;Gates and Hurley 1973). Burwash (1965) did not observe diabase and lamprophyre dikes in contact.…”

Section: General Geologymentioning

confidence: 91%

“…The K-Ar ages of several generations of diabase dikes, the youngest of which cut the Athabasca Formation at Cree Lake, vary from a minimum of 1230 m.y. (Burwash et al 1962) to a maximum of 1835 k 50 m.y. (Wanless et al 1967).…”

Section: General Geologymentioning

confidence: 99%

“…1 ) of syenitic lamprophyre dikes collected in the Fay Mine (Eldorado, Saskatchewan) and in the Oldman River map-area (Burwash 1965) were analyzed for Rb and Sr by X-ray fluorescence spectrometry. Isotope dilution analyses of Rb and Sr in eight samples with favorable R b S r ratios, were performed on a 6 inch, 60" sector, single filament, solid source mass spectrometer, equipped with deflection focussing, peak switching capabilities, and digital printout.…”

Section: Rb-sr Datingmentioning

confidence: 99%

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Rb-Sr Age of the Late-Kinematic Phase of the Hudsonian Orogeny in the Beaverlodge Area, Saskatchewan

Sassano¹,

Baadsgaard²,

Burwash³

1974

Can. J. Earth Sci.

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The Tazin Complex, north of Lake Athabasca, shows widespread development of mylonites associated with northeast trending faults. Hudsonian metamorphism has caused recrystallization of cataclastic rocks with post-crystalline deformation forming narrow zones of later mylonites. Syenitic lamprophyre dikes which, with very few exceptions, are undeformed, form the latest intrusive rocks in the area, filling dilatant fractures developed during crustal uplift. R b S r whole rock dating of eight samples of the dikes in the Beaverlodge area, yield an isochron of 1779 i-72 m.y. (initial ratio = 0.709 0.001, MSWD = 0.39. x("Rb) = 1.39 X 10-U/yr). The late-kinematic phase of the Hudsonian orogeny, therefore, occurred around 1780 m.y. ago, at which time the uplift of the northwestern sector of the Churchill structural province took place. It is also believed that the date is close to the time of final movement of the St. Louis Fault.Le complexe de Tazin, au nord du Lac Alhahasca. montre un dbveloppement Ctendu de mylonites associees B des failles de direction nord-est. Le mktamorphisme hudsonien a causC la recristallisation des roches cataclastiques avec la deformation post-cristalline formant rles zones etroites de mylonites tardives. Des dykes de lamprophyre syknitique qui sont, sauf de rares exceptions, non dCformCs. constituent les roches intrusives les plus tardives dans la rkgion, remplissant les fractures de dilatation dCvelopp6es pendant le soul&vement de la croQte. La datation (roche totale) au R b S r de huit tchantillons des dykes pris dans la rkgion de Beaverlodge, donne un isochrome de 1779 rt 72 millions d'annees (rapport initial = 0.709 2 0.001, MSWD = 0.39, A("Rb) = 1.39 X 10-"/an). La phase tardi-cinkmatique de I'orogine hudsonienne, par conskquent, s'est dkroul6e il y a 1780 millions cl'ann6es environ, au moment oh le soul&venient du sectour nord-ouest de la province structurale de Churchill prenait place. On pense aussi que le mouvement final de la faille de St. Louis s'est produit vers cette date. praduit par le journal]

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Section: General Geologymentioning

confidence: 91%

Section: General Geologymentioning

confidence: 99%

Section: Rb-sr Datingmentioning

confidence: 99%

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Rb-Sr Age of the Late-Kinematic Phase of the Hudsonian Orogeny in the Beaverlodge Area, Saskatchewan

Sassano¹,

Baadsgaard²,

Burwash³

1974

Can. J. Earth Sci.

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“…Previous studies of diabase dikes in the Canadian Shield have relied on K-Ar dating of whole rocks and mineral separates for age assignment (e.g., Fahrig and Wanless 1963;Burwash et al 1963;Leech 1966). Many fine-grained mafic rocks are not particularly suitable for K-Ar dating because they lose radiogenic Ar rather easily.…”

Section: Dating Of Diabase Dikesmentioning

confidence: 99%

Sr isotopic study of Helikian sediment and diabase dikes in the Athabasca Basin, northern Saskatchewan

Armstrong¹,

Ramaekers²

1985

Can. J. Earth Sci.

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The Athabasca Group overlles 1.8 Ga or older basement of the Churchill Province and predates uranium mineralization at 1.3 Ga. Cross-cutring diabase dikes have been dated by Rb-Sr mineral isochrons at 1.3 1 2 0.07 Ga at Diabase Peninsula, Cree Lake, and 1.16 t 0.04 Ga at Lazy Eklward Bay. Cree Lake. Initial "Sr/''Sr ratios for these dikes are 0.7040 2 0.0005 and 0.7036 k 0.002, respectively. Clastic sedimentary rocks d the Athabasca Group normally show limited variation in Rb/Sr and variable initial "Sr/""Sr. Sedimentary rocks in two areas near the northern margin of the Athabasca Basin scatter about isochrons of 2.6 Ga. reflecting Archean provenance af detrital material and lack of Sr isotopic homogenization since deposition. Sediment of the tuffaccous Wolverine Point Formation, near Rumpel Lake, IS much more variable in Rb/Sr and enriched in Rb relative to Sr and defines a 1.43 2 0.03 Ga isochron with a 0.7057 2 0.0005 initial ratio. This is possibly the age of deposition of the Athabasca Group.LC groupe d'Athabasca recouvre un swle Pgd de 1,8 Ga, ou plus ancien, de la province de Churchill et rtvele que la mininlisation en uranium fut mise en piace anlkrieurement B 1,3 Ga. Les dykes de diabase coupant le groupe ont tte dates B I'aide des isochrones Rb-Sr dc mintraux 21 1.3 1 & 0.07 Ga a la p6ninsule Dlabase, lac Cree, et a 1,16 2 0,04 Ga a la baie Lazy Edward, lac Cree. Les rapports initiaux *'Sr/"Sr F u r ces dykes sont 0,7040 * 0,0005 et 0,7036 * 0,0002, respectivement. Les mches ~Cdirncnfaires clast~qucs du g r o u~ d'Athabasca presentent normalement peu de variation du Rb/Sr et un H7Sr/X'~r initial variable. Lrs rnches ddirnentaires dans deux rtgions pres de la limite nord du bassin d'Athabasca Tournissent des isochrones qavitant autour de 2.6 Ga, tkmoignant de la provenance archkenne des matkriaux detritiques et de I'hCt6rogikit& imtopique du Sr depuis I'accurnulation des ddiments. Le mattriel sedimentaire composant la formation tufacke de Wolverine Point, prks du Iac Rurnpd, fournit un Rb/Sr beaucoup plus variable et est enrichie en Rb relativement au Sr et dCfio11 un isochrone 5 1,43 2 0.03 Cia avec un rapport initial de 0,7057 2 0,0005. Ce qui correspond possiblement a I'bge dc sckfimentntion du gmupe d'Athabasca.[Traduit par le journal]Can.

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“…To date, study of the Canadian Shield has been investigated mainly on the surface through geological and geophysical field mapping (e.g., Langenberg and Nielsen 1982;Goff et al 1986;Burwash et al 1994Burwash et al , 2000McDonough et al 2000). The exposed Canadian Shield in the northeastern part of Alberta allows for direct mapping of the Proterozoic metamorphic rocks where the exposed geology can be traced unambiguously into the subsurface using magnetic mapping (Ross 2000).…”

Section: Geological Overviewmentioning

confidence: 99%

Initial seismic observations from a deep borehole drilled into the Canadian Shield in northeast Alberta

Chan

Schmitt

2014

Int J Earth Sci (Geol Rundsch)

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Precambrian K-Ar dates from the Western Canada Sedimentary Basin

Cited by 68 publications

References 11 publications

Rb-Sr Age of the Late-Kinematic Phase of the Hudsonian Orogeny in the Beaverlodge Area, Saskatchewan

Rb-Sr Age of the Late-Kinematic Phase of the Hudsonian Orogeny in the Beaverlodge Area, Saskatchewan

Sr isotopic study of Helikian sediment and diabase dikes in the Athabasca Basin, northern Saskatchewan

Initial seismic observations from a deep borehole drilled into the Canadian Shield in northeast Alberta

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