Abstract

Core-complex tectonite results from simple-shear rotational strain within regional ductile shear zones that have accommodated a Tertiary crustal stretching. The emplacement of younger and/or upper-level nontectonite rocks on older and/or deeper level tectonites is the ordinary and predictable result of normal-slip translation along shear zones that cut upward through the local geologic column. Progressive deformation produces a structural stratigraphy marked, from bottom to top, by normal country-rock protolith, mylonitic gneiss, tectonite carapace, microbrecciated tectonite, microbreccia, decollement, and upper-plate detachment rocks (as young as mid-Miocene). The reconstructions suggest that local regional crustal stretching locally exceeded 100%.

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