Uplift in the Fiordland Region, New Zealand: Implications for Incipient subduction

摘要

Low-temperature thermochronometry reveals regional Late Cenozoic denuda- tion in Fiordland, New Zealand, consistent with geodynamic models showing uplift of the overriding plate during incipient subduction. The data show a northward progression of exhumation in response to northward migration of the initiation of subduction. The locus of most recent uplift coincides with large positive Bouguer gravity anomaly within Fiordland. Thermochronometri- cally deduced crustal thinning, anomalous gravity, and estimates of surface uplift are all consistent with -2 kilometers of dynamic support.