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Salmon et al. 1986

Salmon, E., Montigny, R., Edel, J.B., Pique, A., Thuizat, R. and Westphal, M. (1986). The MSISSI norite revisited: K/AR dating, petrography and paleomagnetism. Geophysical Research Letters 13: doi: 10.1029/GL013i008p00741. issn: 0094-8276.

The ''Msissi norite'' in Morocco (30.93¿ N, 4.71¿ W) from where one of the paleomagnetic reference pole for Africa in Devonian times has been derived, has been revisited and dated. Petrological examination shows that rock is an alkaline gabbro (teschenite). K-Ar analyses on fresh biotite yield a 136--139 Ma age, which infirms the supposed Devonian age. The paleomagnetic study displays several distinct magnetic components.

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Geophysical Research Letters
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