The 40Ar/39Ar age dating of the Madeira Archipelago and hotspot track (eastern North Atlantic)
- 23 February 2000
- journal article
- research article
- Published by American Geophysical Union (AGU) in Geochemistry, Geophysics, Geosystems
- Vol. 1 (2)
- https://doi.org/10.1029/1999gc000018
Abstract
The 40Ar/39Ar ages for 35 volcanic rocks and 14C ages for two charcoal samples from the Madeira Archipelago and Ampère Seamount (eastern North Atlantic) are presented. The volcanic evolution of Madeira can be divided into a voluminous shield stage (>4.6–0.7 Ma) and a subsequent low‐volume posterosional stage (70 Myr old hotspot which formed Porto Santo Island (11.1–14.3 Ma), Seine, Ampère (31 Ma), Corral Patch and Ormond (65–67 Ma [Féraud et al., 1982, 1986]) Seamounts, and the Serra de Monchique (70–72 Ma [McIntyre and Berger, 1982]) complex in southern Portugal. Age and spatial relationships result in a calculated absolute African plate motion above the hotspot of 1.2 cm/yr around a rotation pole located at 43°36′N/ 24°33′W.Keywords
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