Abstract
Thermal demagnetization of 83 Cambrian volcanic samples reveals three components. The low temperature component is associated with the present geomagnetic field. The intermediate temperature component (200–500°C) has a mean direction 138.2°, 2.6° (N=11 sites, k=66, α 95=5.7° in situ) which is post folding and its palaeomagnetic pole (38.0° S, 51.6° E, δm=2.8°, δ p=6.8°) corresponds to a Permian overprint. The high temperature component (>300° C) has a mean direction 321.5°,−7.7° (N=7 sites, k=106, α 95=6.8° tectonic corrected) which pre-dates folding but differs from that obtained for the Cambrian Sidi Saïd-Maâchou volcanics of the Coastal Meseta (300°, −31°, α 95=6°). This component is inferred to have been acquired during the low grade regional Hercynian metamorphism that affected the Georgian limestones of Bou Acila.
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