Saltus et al. (2001) present a two-dimensional model for rooted versus ophiolitic mafic and ultramafic rocks throughout the Cordillera based on a local geophysical anomaly in part of the southwest Brooks Range. Their model estimates a mafic and ultramafic rock body thickness of ∼8 km. Although this is well within the range of ophiolite nappes, they infer that a thick body cannot be allochthonous and must have intruded into continental margin units during passive margin development. We argue that there is no basis for this interpretation, and that it is incompatible with what is known about the field, petrochemical and...

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