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Cambrian intra-oceanic arc accretion to the austral Gondwana margin: constraints on the location of proto-New Zealand

Record type: Article

Data from New Zealand and northern Victoria Land, Antarctica, indicate that the Cambrian Takaka Terrane intra-oceanic arc/backarc assemblage and the Bowers Terrane intra-oceanic arc/back-arc assemblage were accreted to the Gondwana margin by the Late Cambrian. Compelling similarities between the arc rocks and the immediate post-arc sediments firmly place the two regions in the same tectonic framework and imply close paleogeographic proximity. Currently, the Ross Orogen is thought to be the result of sinistral oblique convergence with west-directed subduction, and accretion of the arc assemblages is attributed to closure of backarc basins. Syntectonic fluvial conglomerates in both regions attest to the development of fluvial systems draining both the accreted arc and the contemporaneous continental margin arc. Trilobite faunas indicate that fluvial sedimentation commenced earlier in New Zealand than in northern Victoria Land. In the context of the widely accepted sinistral oblique convergence model, these data suggest an original position for New Zealand to the south of northern Victoria Land, probably in the region of the southern Ross Sea.

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Citation

Bradshaw, J.D., Gutjahr, M., Weaver, S.D. and Bassett, K.N. (2009) Cambrian intra-oceanic arc accretion to the austral Gondwana margin: constraints on the location of proto-New Zealand Australian Journal of Earth Sciences, 56, (4), pp. 587-594. (doi:10.1080/08120090902806339).

More information

Published date: 2009
Additional Information: Times Cited: 5

Identifiers

Local EPrints ID: 191623
URI: http://eprints.soton.ac.uk/id/eprint/191623
ISSN: 0812-0099
PURE UUID: 0b6cfe75-4e81-42f9-88cb-c31f2ebdd387

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Date deposited: 23 Jun 2011 08:56
Last modified: 18 Jul 2017 11:35

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Contributors

Author: J.D. Bradshaw
Author: M. Gutjahr
Author: S.D. Weaver
Author: K.N. Bassett

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