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The Cambrian Ross Orogeny in northern Victoria Land (Antarctica) and New Zealand: A synthesis

Open-File Report 2007-1047-SRP-063

By:
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DOI: 10.3133/ofr20071047SRP063

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Abstract

In the Cambrian, the paleo-Pacific margin of the Gondwana supercontinent included East Antarctica, Australia, Tasmania and New Zealand and was affected by themajor Ross-Delamerian Orogeny. In Antarctica, evidence suggests that this resulted from oblique subduction and that in northern Victoria Land it was accompanied by the opening and subsequent closure of a back-arc basin. Comparison of the type and timing of sedimentary, magmatic and metamorphic events in areas noted above shows strong similarities between northern Victoria Land and New Zealand. In both regions Middle Cambrian volcanites are interpreted as arc/back-arc assemblages produced by west-directed subduction; sediments interbedded with the volcanites show provenance both from the arc and from the Gondwana margin and therefore place the basin close to the continent. Back-arc closure in the Late Cambrian was likely accomplished through a second subduction system

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
The Cambrian Ross Orogeny in northern Victoria Land (Antarctica) and New Zealand: A synthesis
Series title:
Open-File Report
Series number:
2007-1047-SRP-063
DOI:
10.3133/ofr20071047SRP063
Year Published:
2007
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
5 p.
Larger Work Type:
Report
Larger Work Subtype:
USGS Numbered Series
Other Geospatial:
Antarctica;Victoria Land
Additional Online Files(Y/N):
N