Interaction between Strike-Slip and Thrust-Shear: Deformation of the Bullbreen Group, Central-Western Spitsbergen

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Abstract
Field mapping and strain measurement data are used to infer a deformation history for synorogenic, subgreenschist facies sedimentary rocks of the Ordovician Bullbreen Group in central-western Spitsbergen. Evidence for true extension parallel to fold axes, and comparison of incremental strains preserved by fiber-filled extension veins with numerical deformation models, suggest that strike-slip shear was a significant component in what was generally a thrust-shear deformation regime. Initial dextral strike-slip shear parallel to the fault-controlled Bullbreen sedimentary basin subsequently decreased in importance relative to thrusting perpendicular to the basin margin. Although the presumed Caledonian-aged dextral strike-slip motion described here may have been a local phenomenon, it is difficult to reconcile with existing models of N-S orientated, large-scale, sinistral strike-slip in western Spitsbergen.

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