<p>Early Proterozoic oceanic crust exposed in a shear zone in the northern Colorado Front Range provides insight into the tectonic evolution of the Colorado province.</p>

<p>The object of this study is to construct a lithologic and geochemical model of the crust in the central Colorado Plateau, based on the combined input of field, xenolith, seismic, and heat flow data. The Four Corners area straddles a proposed Proterozoic crustal ...