Abstract
The 40Ar−39Ar dating of the amphibole from the Beja gabbro (Southern Portugal) yields a plateau age at 336.4 ± 0.8 Ma (2σ level). The corresponding calculated isotopic closure temperature is around 800°C. The comparison of this temperature with the magnetic blocking temperature (∼570°C) allows an estimation of a probable thermoremanent acquisition age for the characteristic magnetization component of the Beja gabbro between 335Ma and 315Ma, assuming cooling rates between 10°C/Ma and 100°C/Ma. These results, combined with palaeomagnetic results from the Beja gabbro and Late Paleozoic rocks from Southern Portugal [Perroud et al., 1985], suggest that the southermost part of Spain and Portugal was separated from Northern Iberia in Early Carboniferous times and was accreted to Europe during the Late Carboniferous.
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