⁴⁰Ar/³⁹Ar hornblende and biotite cooling ages for metaplutonic rocks of the central Thelon tectonic zone, Nunavut / A. Camacho, R.G. Berman, and M. Sanborn-Barrie. : M183-2/8625E-PDF

"The Thelon tectonic zone (Ttz) is a ~500 km long, northeast-striking geophysical and geological feature separating the Slave and Rae cratons of the Canadian shield. The tectonic significance of the Ttz is uncertain, having been interpreted both as a Paleoproterozoic suture and as an intracontinental orogenic belt. Better understanding of the tectonic setting of the Ttz and the control of its crustal architecture on economic potential were primary goals of the Geomapping for Energy and Minerals (GEM) Thelon tectonic zone research activity. This report presents 43 new ⁴⁰Ar/³⁹Ar hornblende and biotite analyses for metaplutonic rock samples from the central Ttz and adjacent regions, Nunavut. Samples were collected during three field seasons (2012, 2014, and 2016) in order to: (i) delineate domains with differing cooling histories and (ii) improve understanding of the differences in timing of regional metamorphism and exhumation across the Ttz. These data will be used in the future to evaluate and refine tectonic models for the evolution of the Ttz"—Introduction, page 1.

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