cris.boxmetadata.label.title
Palaeomagnetic results from the Early Permian Copacabana Group, southern Peru: Implication for Pangaea palaeogeography
cris.boxmetadata.label.dateissued
10 browse.startsWith.months.february 2006
cris.boxmetadata.label.accesslevel
metadata only access
cris.boxmetadata.label.resourcetype
journal article
cris.boxmetadata.label.abstract
Samples collected from folded carbonate rocks of the Early Permian Copacabana Group exposed in the Peruvian Subandean Zone have been subjected to detailed palaeomagnetic analysis. Thermal demagnetisation of most samples yield stable high unblocking temperature directions dominantly carried by titanomagnetite minerals. This remanence, identified in 32 samples (43 specimens), is exclusively of reverse polarity consistent with the Permian-Carboniferous Reversal Superchron (PCRS). The overall directions pass the fold test at the 99% confidence level and are considered as being a pre-folding remanence acquired in Early Permian times. The Copacabana Group yields an overall mean direction of D=166°, I=+49° (α95=4.5°, k=131.5, N=9 sites) in stratigraphic coordinates and a corresponding palaeosouth pole position situated at λ=68°S, φ=321°E (A95=5.2°, K=100). Combining this pole with the coeval high quality data from South America, Africa and Australia results in a mean pole for Gondwana situated at λ=34.4°S, Φ=065.6°E (A95=4.9°, K=73.6, N=13 studies) in African coordinates. This pole position supports a Pangaea B palaeogeography in Early Permian times. In contrast, the combined pole for Gondwana diverges from the coeval Laurasian mean pole when assuming the Pangaea A-type configuration. Poor quality of the Gondwana dataset and inclination shallowing in sediments seem to play no role in the misfit between the Permian-Triassic poles from Gondwana and Laurasia in Pangaea A reconstruction. © 2005 Elsevier B.V. All rights reserved.
cris.boxmetadata.label.citationstartpage
287
cris.boxmetadata.label.citationendpage
299
cris.boxmetadata.label.volume
413
cris.boxmetadata.label.issue
browse.startsWith.months.april 3
cris.boxmetadata.label.language
English
cris.boxmetadata.label.ocdeknowledgeArea
Geociencias, Multidisciplinar
cris.boxmetadata.label.doi
cris.boxmetadata.label.scopusidentifier
2-s2.0-31344441939
cris.boxmetadata.label.source
Tectonophysics
cris.boxmetadata.label.partofresource
Tectonophysics
cris.boxmetadata.label.containerissn
00401951
cris.boxmetadata.label.sourcefunding
Volkswagen Foundation
cris.boxmetadata.label.sponsor
Funding of this project provided by the Volkswagen-stiftung is gratefully acknowledged. Dr. Giovanni Muttoni, Dr. Silvana Geuna and Dr. Haroldo Vizán are thanked for their helpful reviews of an earlier version of this paper.
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