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Patterns of Late Cenozoic exhumation deduced from apatite and zircon U-He ages from Fiordland, New Zealand

House, M. A. and Gurnis, M. and Sutherland, R. and Kamp, P. J. J. (2005) Patterns of Late Cenozoic exhumation deduced from apatite and zircon U-He ages from Fiordland, New Zealand. Geochemistry, Geophysics, Geosystems, 6 (9). 2005GC000968. ISSN 1525-2027. http://resolver.caltech.edu/CaltechAUTHORS:HOUggg05

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Abstract

New apatite and zircon (U-Th)/He ages from the Fiordland region of New Zealand's South Island expand on earlier results and provide new constraints on patterns of Late Cenozoic exhumation and cooling across this region. Zircon (U-Th)/He cooling ages, in combination with increased density of apatite ages, show that in addition to a gradual northward decrease in cooling ages that was seen during an earlier phase of this study, there is also a trend toward younger cooling ages to the east. Distinct breaks in cooling age patterns on southwestern Fiordland appear to be correlated to the location of previously mapped faults. The northward decrease in ages may reflect asynchronous cooling related to migration in the locus of exhumation driven by subduction initiation, or it may reflect synchronous regional exhumation that exposed different structural levels across Fiordland, or some combination of these effects. In either case, differential exhumation accommodated by major and minor faults that dissect Fiordland basement rocks apparently played an important role in producing the resulting age patterns.


Item Type:Article
Additional Information:Copyright 2005 by the American Geophysical Union. Received: 11 March 2005; Revised: 8 July 2005; Accepted: 21 July 2005; Published: 20 September 2005. This work was supported by NSF grant EAR-0003558 to House and Gurnis. We thank Lindsey Hedges at Caltech for assistance in apatite and zircon dating. JoAnne Giberson at Caltech was invaluable in constructing our basemaps.
Subject Keywords:exhumation; Fiordland; helium; New Zealand; subduction; thermochronology; 1130 Geochronology: Geomorphological geochronology; 1140 Geochronology: Thermochronology; 3060 Marine Geology and Geophysics: Subduction zone processes (1031, 3613, 8170, 8413)
Record Number:CaltechAUTHORS:HOUggg05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HOUggg05
Alternative URL:http://dx.doi.org/0.1029/2005GC000968
Official Citation:House, M. A., M. Gurnis, R. Sutherland, and P. J. J. Kamp (2005), Patterns of Late Cenozoic exhumation deduced from apatite and zircon U-He ages from Fiordland, New Zealand, Geochem. Geophys. Geosyst., 6, Q09013, doi:10.1029/2005GC000968.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1113
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 Dec 2005
Last Modified:26 Dec 2012 08:42

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