New 40Ar-39Ar geochronological data at two areas of interest in the Anaga massif (Tenerife)Punta Poyata and Igueste de San Andrés. Some implications

1. J.A. Rodríguez-Losada ¹
2. M. Ferrer ²
3. L. González de Vallejo ³
4. J. Martínez-Frías ⁴
5. L.E. Hernández-Gutiérrez ¹

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More publications in: Geotemas (Madrid)

Abstract

This work provides new Ar40-Ar39 geochronological data in submarine ankaramite rocks located in two distant points of Anaga (NE Tenerife): the submarine hydrothermally altered ankaramites of Punta Poyata area (NNW Anaga) and the ankaramitic pillow lavas at Barranco de Igueste (SE Anaga). The studied samples were collected from outcrops of the lowest stratigraphic levels throughout the volcanics that buildup the Anagamassif. At Punta Poyata, two collected samples yielded an age of 12,2 ± 1,9 Ma and 13,0 ± 1,0 Ma. At Barranco de Igueste, sample results are of 12,7 ± 1,6 Ma and 9,7 ± 1,0 Ma. These data supportthe assumptionthat the Anagamassifbegan its subaerialgrowthearlier than that previously was supposed, most likely in the Mid-Miocene Instead of late Miocene as currently believed.

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