Abstract

Travel-time data from a seismic refraction profile within western Fiordland, southwest New Zealand, gives no indication of a 6.0 km/s upper-crustal layer typical of most continental crustal sections. The data substantiate the existence of high-velocity material typical of the lower crust, at shallow depths beneath western Fiordland. The velocity gradient below 2.5 km depth is suggestive of that expected from increasing pressure with depth acting on a uniform section of granulite facies rock similar to those cropping out at the surface. The seismic data support the conclusions based on surface geologic observations, that western Fiordland represents a section of uplifted lower crust.

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