Uplift in the Fiordland region,New Zealand: implications for incipient subduction |
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Authors: | House M A Gurnis M Kamp P J J Sutherland R |
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Institution: | Division of Geological and Planetary Sciences, Caltech, Pasadena, CA 91125, USA. mhouse@gps.caltech.edu |
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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 approximately 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. |
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