Publication information

Geological Survey of Canada
Current Research 2017-4

New U-Pb zircon ages of plutonic rocks from the Jeannin Lake area, Quebec: an evaluation of the Kuujjuaq domain and Rachel-Laporte Zone

N.M. Rayner, I. Lafrance, D. Corrigan, and B. Charette 

© Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2017

Permanent link: https://doi.org/10.4095/306180

Recommended citation

Rayner, N.M., Lafrance, I., Corrigan, D., and Charette, B., 2017. New U-Pb zircon ages of plutonic rocks from the Jeannin Lake area, Quebec: an evaluation of the Kuujjuaq domain and Rachel-Laporte Zone; Geological Survey of Canada, Current Research 2017–4, 1 .zip file. https://doi.org/10.4095/306180

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Abstract

Three strongly foliated or recrystallized samples were identified in the field as potential Archean basement and were collected for geochronology in order to compare their crystallization ages with the ages of known basement in the Superior Craton and Core Zone. A porphyritic monzonite from the thrust-bound Boullé Complex within the Rachel-Laporte Zone yields a crystallization age of 2690 ± 4 Ma. A 2696 ± 4 Ma magnetite granite of the Saffray Suite is similar in age and composition to large potassic suites of the Superior Craton. These ages stand in contrast to a younger 2668 ± 5 Ma crystallization age for a tonalite of the Wheeler Complex from a separate structural dome within the Rachel-Laporte Zone.

The ages of the Champdoré and Lhande plutonic suites are 1839 ± 6 Ma and 1835 ± 4 Ma, respectively. As these units are metamorphosed and strongly foliated, they also provide a maximum age constraint on peak Paleoproterozoic tectonothermal overprint. The post-tectonic pegmatite of the Dancelou Suite provides a 1793 ± 4 Ma constraint on the cessation of deformation in that area.

Résumé

Trois échantillons fortement foliés ou recristallisés, identifiés sur le terrain comme appartenant possiblement au socle archéen, ont été recueillis pour analyse géochronologique en vue de comparer leurs âges de cristallisation avec les âges obtenus pour le socle rocheux dans le craton du lac Supérieur et la Zone noyau. Une monzonite porphyrique provenant du Complexe de Boullé, qui se trouve dans la Zone de Rachel-Laporte et est bordé par des failles de chevauchement, a donné un âge de cristallisation de 2690 ± 4 Ma. Un granite à magnétite de 2696 ± 4 Ma provenant de la Suite de Saffray ressemble par son âge et sa composition à des suites potassiques volumineuses du craton du lac Supérieur. Ces âges contrastent avec l’âge de cristallisation plus jeune (2668 ± 5 Ma) d’une tonalite provenant du Complexe de Wheeler, dans un dôme structural distinct au sein de la Zone de Rachel-Laporte.
Les âges des suites plutoniques de Champdoré et de Lhande sont de 1839 ± 6 Ma et de 1835 ± 4 Ma, respectivement. Comme ces entités sont métamorphosées et fortement foliées, elles fournissent également une limite d’âge supérieure pour le maximum de la surimpression tectonothermique qui a eu lieu au Paléoprotérozoïque. La pegmatite post-tectonique de la Suite de Dancelou indique un âge maximum de 1793 ± 4 Ma pour la fin de la déformation dans cette région.

Directory structure

cr_2017_04_gsc_readme.rtf (this file)
cr_2017_04_gsc.pdf (report)
Appendix A\cr_2017_04_gsc_App_A.xlsx (Appendix A in Microsoft® Excel® spreadsheet format)
Appendix A\cr_2017_04_gsc_App_A.csv (Appendix A in comma separated variable format)

Author contact information

N.M. Rayner (Nicole.Rayner@canada.ca)
D. Corrigan (David.Corrigan@canada.ca)
Geological Survey of Canada
601 Booth Street
Ottawa, Ontario  K1A 0E8

I. Lafrance (Isabelle.Lafrance@mern.gouv.qc.ca)
B. Charette (Benoît.Charette@mern.gouv.qc.ca)
Ministère de l’Énergie et des Ressources naturelles
5700, 4e Avenue Ouest, local D-307
Québec, Quebec  G1H 6R1

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