A 140 Ma K/Ar age for the Msissi norite (Morocco): new geochemical and paleomagnetic data

Details A 140 Ma K/Ar age for the Msissi norite (Morocco): new geochemical and paleomagnetic data A 140 Ma K/Ar age for the Msissi norite (Morocco): new geochemical and paleomagnetic data

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..81..265s&link_type=abstract

Earth and Planetary Science Letters, Volume 81, Issue 2-3, p. 265-272.

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The plutonic intrusion known as the Msissi norite (southern Morocco), which represents the single paleomagnetic reference pole for Africa in Devonian times, has been investigated. This Msissi intrusion is in fact an alkaline gabbro, a teschenite. K/Ar dating on separate biotites yields a 140 Ma age. Paleomagnetic results reveal a large scatter of isolated directions that precludes the computation of any Late Jurassic/Early Cretaceous paleopole. All these data lead us to reject this intrusion as a reference pole for the Devonian in Africa. The paleoposition of Africa in Devonian times remains, therefore, largely unknown.

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