| Titre | Progress report on U-Pb geochronology results for the Peter Lake Domain Project |
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| Auteur | Rayner, N M ;
Maxeiner, R O; Corrigan, D |
| Source | Summary of Investigations 2005, Volume 2, Saskatchewan Geological Survey; Saskatchewan Industry and Resources Miscellaneous Report 2005-4.2, 2005 p. 1-12  Accès ouvert |
| Liens | Online - En ligne
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| Image |  |
| Année | 2005 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 2005418 |
| Document | publication en série |
| Lang. | anglais |
| Media | numérique; en ligne; CD-ROM |
| Référence reliée | Cette publication est accompagnée par U-Pb
isotopic data in support of results presented in 'Progress report on U-Pb geochronology results for the Peter Lake Domain Project' (in Summary of Investigations 2005, Volume 2; Saskatchewan Geological Survey, Saskatchewan Industry and Resources,
Miscellaneous Report 2005-4.2; by Rayner et al., 2005) |
| Formats | pdf (Adobe® Reader®) |
| Programme | La mise en valeur des ressources du Nord |
| Résumé | (disponible en anglais seulement)
We report preliminary zircon U-Pb geochronological results from a suite of plutonic rocks from the Peter Lake Domain along northern Reindeer Lake. The
crystallization age of a foliated granite is interpreted to be ca. 2.58 Ga, but it also contained inherited material older than 2.62 Ga. A sample of sulphide-bearing gabbro is shown to have crystallized at 2562 ±3 Ma, linking it with the Archean Swan
River Complex of mafic rocks. A foliated gabbro in the Zengle Lake area yielded one concordant zircon fraction with an age of 2435 ±9 Ma. Further analyses are pending to determine the significance of this age. A massive leucogabbro, collected west of
the Patterson Island channel, is identified as part of the Patterson Island pluton, as it yielded a preliminary crystallization age of 1.91 Ga. More analyses are being conducted to further refine this age estimate. A megacrystic quartz monzonite
sample, also from Zengle Lake, is interpreted to have crystallized at ca. 1.85 Ga. Some zircon inheritance, with minimum ages of 1.9 to 2.1 Ga, has been observed in this sample. A sample of megacrystic monzogranite on Fontaine Island gave an age of
1865 +4/-2 Ma. A rhythmically layered anorthosite gabbro was collected southwest of the Feaviour Peninsula and yielded an upper intercept age of 1854 +5/-4 Ma. A quartz diorite collected near Crane Island is tentatively ascribed to the Wathaman
Batholith age intrusions, as a single, concordant zircon fraction gave an age of 1.85 Ga. Further fractions are pending. A syenogranite from northwest of Patterson Island, yielded the youngest plutonic age so far reported in the Peter Lake Domain at
1829 ±5 Ma. |
| GEOSCAN ID | 221338 |
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