40Ar/39Ar and apatite FT constraints on the activity of the Temsamane extensional detachment (eastern Rif, Morocco)

  1. A. Jabaloy-Sánchez 1
  2. G. Booth-Rea 1
  3. A. Azdimousa 2
  4. L. Asebriy 3
  5. Vázquez Vílchez, María Mercedes
  6. J.M. Martínez Martínez 1
  7. J. Gabites 4
  1. 1 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  2. 2 Université Mohammed I, Oujda (Morocco).
  3. 3 Université Mohammed V, Agdal-Rabat (Morocco).
  4. 4 University of British Columbia,Vancouver (Canada)
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2012

Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Issue: 13

Pages: 1650-1653

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

New 40Ar/39Ar radiometric ages on amphiboles and white micas from the footwall of the Temsamane detachment indicate that the metamorphic peak was reached at ca. 21 Ma (Aquitanian), producing greenschists facies metamorphism in the uppermost Temsamane units. The cooling of the footwall rocks below 325 ºC occurred at ca. 13 Ma (Serravallian). Apatite fission track ages indicate that the cooling below 120 ºC occurred at 11.58 ± 2.4 Ma (Early Tortonian). The 40Ar/39Ar radiometric ages on amphiboles of the metamorphic klippes over the Temsamene units (Ait-Amrâne massif) indicates that the Jurassic marbles of the Tanger-Ketama Unit reached their metamorphic peak at ca. 80 Ma (Campanian), in agreement with previously published K/Ar in micas and zircon and apatite FT ages. We interpret the increase of cooling rates of the footwall rocks between 13 Ma and 11.5 Ma (SerravallianTortonian) as due to the activity of the Temsamane detachment fault.

Data source: Dialnet