Evidence for contrasting tectonic trajectories in adjacent domains in the Shuswap complex, southeastern Canadian Cordillera

Davide Zanoni (a), Guido Gosso (a,b), Yvette D. Kuiper (c), M. Iole Spalla (a,b) & Paul F. Williams (d)
(a) Dipartimento di Scienze della Terra "A. Desio", Università degli Studi di Milano, via Mangiagalli, 34, 20133 Milano, Italy. E-mail: davide.zanoni@unimi.it (b) CNR-IDPA, via Mangiagalli, 34, 20133 Milano, Italy. (c) Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO, 80401 U.S.A. (d) Department of Earth Sciences, University of New Brunswick, 2 Bailey Drive, Fredericton, NB, E3B 5A3 Canada.

Meso- and microstructural analysis integrated with mineral chemical and radiometric data reveal the existence of two different tectonometamorphic units within the structural stack of the Shuswap metamorphic complex, during the development of the transposition regional fabric. One comprises the northwestern edge of the Thor-Odin dome. The other the Joss Mountain domain of the Selkirk allochthon. Both units were exhumed under a high thermal regime compatible with lithospheric thinning, and preserve contrasting histories predating the Cordilleran transposition.

Monashee complex, Rodinia break up, tectonometamorphic units