Abstract: This contribution focuses on the analysis, characterization, and mineralization control of northeast-southwest oriented, magnetic heterogeneities of the allochthonous to parautochthonous Intermontane terranes of the North American Cordillera of western Yukon and eastern Alaska. Our interpretation of publically available magnetic datasets proposes sixteen zones of linear discontinuities oriented semi-perpendicular to the northwest-southeast Cordilleran deformation front and mid-Cretaceous Dawson Range magmatic arc. These magnetite-destructive corridors are interpreted as steeply dipping, brittle fault zones and fracture arrays of extensional, oblique-extensional, and strike-slip kinematics responsible for localized structural damage. Their spatial correlation with known mid to Late Cretaceous magmatic-hydrothermal mineralization suggests a first-order structural control in eastern Alaska, while a secondary role is interpreted for Yukon’s Dawson Range.

Authors: Sanchez, M.G., Allan, M.M., Hart, C.J.R. and Mortensen, J.K.

Citation: Sanchez, M.G., Allan, M.M., Hart, C.J.R. and Mortensen, J.K., 2013. Orogen-perpendicular magnetic segmentation of the western Yukon and eastern Alaska cordilleran hinterland: Implications for structural control of mineralization. In: Yukon Exploration and Geology 2012, K.E. MacFarlane, M.G. Nordling and P.J. Sack (eds.), Yukon Geological Survey, p. 133-146.

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