U-Pb ages for magmatism and deformation in the New Quebec Orogen

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doi: 10.1139/e17-058
Authors:Machado, N.; Clark, T.; David, J.; Goulet, N.
Author Affiliations:Primary:
Université du Québec à Montréal, GEOTOP, Montreal, QC, Canada
Other:
Ministère des Ressources Naturelles du Québec, Canada
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 34(5), p.716-723. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1997
Note:In English with French summary. Includes an appendix; Minist. Ressour. Nat. Que., Contrib. No. 93-5110-25. 32 refs.; illus., incl. 2 tables, geol. sketch map
Summary:A glomero-porphyritic gabbro from the Hellancourt formation was dated at 1874 ± 3 m.y. and a rhyodacite from the upper Murdoch formation yielded an identical age of 1870 ± 4 m.y. These results allow correlation of the two units and show that they are 10-14 m.y. younger than the estimated age for the Sokoman formation. Magmatism related to the younger magmatic event occurred at 1884-1870 m.y. Albitized pelites from the Murdoch formation contain euhedral detrital zircons 2707-2690 m.y. old, indicating that the source rocks were Archaean. An undeformed monzonitic intrusion occurring close to Nachicapau Lake is 1813 ± 4 m.y. old and gives the lower limit for the age of deformation in the central sector of the orogen. [R.A.H.]
Subjects:Absolute age; Dates; Fold and thrust belts; Gabbros; Igneous rocks; Orogeny; Paleoproterozoic; Plutonic rocks; Precambrian; Proterozoic; Rhyodacites; Tectonics; U/Pb; Upper Precambrian; Volcanic rocks; Canada; Eastern Canada; Labrador Trough; Quebec; Ungava; Hellancourt Formation; Igneous activity; Murdoch Formation; New Quebec Orogeny; Northern Quebec
Coordinates:N554500 N554500 W0670000 W0670000
N563000 N570000 W0690000 W0700000
N583000 N583000 W0700000 W0700000
Abstract Numbers:97M/3483
Record ID:1997040918
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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