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

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 …

Año de publicación:

2006

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