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Palaeomagnetic results from the Early Permian Copacabana Group, southern Peru: Implication for Pangaea palaeogeography

Rakotosolofo, N. A., J. A. Tait, V. Carlotto, and J. Cardena (2006), Palaeomagnetic results from the Early Permian Copacabana Group, southern Peru: Implication for Pangaea palaeogeography, Tectonophysics, 413(3-4), 287-299, doi:10.1016/j.tecto.2005.10.043.

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 degrees, I=+49 degrees (alpha(95)=4.5 degrees, k=131.5 N=9 sites) in stratigraphic coordinates and a corresponding palaeosouth pole position situated at lambda=68 degrees S, phi=321 degrees E (A(95)=5.2 degrees, 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 lambda=34.4 degrees S, phi=065.6 degrees E (A(95)=4.9 degrees, 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. (c) 2005 Elsevier B.V. All rights reserved.
BibTeX
@article{id126,
  author = {N. A. Rakotosolofo and J. A. Tait and V. Carlotto and J. Cardena},
  journal = {Tectonophysics},
  number = {3-4},
  pages = {287-299},
  title = {{Palaeomagnetic results from the Early Permian Copacabana Group, southern Peru: Implication for Pangaea palaeogeography}},
  volume = {413},
  year = {2006},
  language = {en},
  doi = {10.1016/j.tecto.2005.10.043},
}
EndNote
%0 Journal Article
%A Rakotosolofo, N. A.
%A Tait, J. A.
%A Carlotto, V.
%A Cardena, J.
%D 2006
%N 3-4
%V 413
%J Tectonophysics
%P 287-299
%T Palaeomagnetic results from the Early Permian Copacabana Group, southern Peru: Implication for Pangaea palaeogeography
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Printed 20. Sep 2020 19:14