The initiation and growth of transpressional shear zones through continental arc lithosphere, southwest New Zealand

Keith Klepeis, Joshua Schwartz, Elena Miranda, Peter Lindquist, Richard Jongens, Rose Turnbull & Harold Stowell
Structural analyses combined with new U-Pb zircon and titanite geochronology show how two Early Cretaceous transpressional shear zones initiated and grew through a nearly complete section of continental arc crust during oblique convergence. Both shear zones reactivated Carboniferous faults that penetrated the upper mantle below Zealandia’s Median Batholith but show opposite growth patterns and dissimilar relationships with respect to arc magmatism. The Grebe-Indecision Creek shear zone was magma-starved and first reactivated at ~136 Ma as...
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