Report

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

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Science  20 Sep 2002:
Vol. 297, Issue 5589, pp. 2038-2041
DOI: 10.1126/science.1075328

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Abstract

Low-temperature thermochronometry reveals regional Late Cenozoic denudation 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 a large positive Bouguer gravity anomaly within Fiordland. Thermochronometrically deduced crustal thinning, anomalous gravity, and estimates of surface uplift are all consistent with ∼2 kilometers of dynamic support. This amount of dynamic support is in accord with geodynamic predictions, suggesting that we have dated the initiation of subduction adjacent to Fiordland.

  • * To whom correspondence should be addressed. E-mail: mhouse{at}gps.caltech.edu

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