Geochronology and detrital zircons sources from the Sierra Albarrana Domain (SW Iberian Massif)

Authors

  • Byron Solis Alulima Dpto. de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid
  • Jacobo Abati Gómez Dpto. de Mineralogía y Petrología e Instituto de Geociencias (UCM, CSIC), Facultad de Ciencias Geológicas, Universidad Complutense de Madrid
  • Alicia López Carmona Dpto. de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid
  • Gabriel Gutiérrez Alonso Dpto. de Geología, Universidad de Salamanca
  • Javier Fernández Suárez Dpto. de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid

DOI:

https://doi.org/10.55407/geogaceta95417

Keywords:

U-Pb geochronology, Maximum Despositational Age (MDA), Cadomian Orogen, Cambro-Ordovician Magmatism, Sierra Albarrana Domain

Abstract

This study compiles the U-Pb and 40Ar/39Ar geochronology of the metasedimentary, migmatitic and granitic rocks of the Sierra Albarrana Domain, based on data recently published by the authors together with other bibliographic sources. Maximum depositional ages (MDA) and magmatic and metamorphic events ages are discussed. MDAs suggest that this domain was deposited during the middle Cambrian (ca. 511) and U-Pb ages of zoned magmatic and metamorphic zircon grains indicate that the main tectono-magmatic event is late Cambrian (granite emplacement; 481 ± 2 Ma) to early Ordovician (migmatization; 478 ± 2 Ma). The 40Ar-39Ar ages evidence a Cambro-Ordovician metamorphic event (ca. 482 Ma) and another related to the Variscan Orogeny (ca. 337-392 Ma). The most important detrital source corresponds to a Cambrian magmatic event (535-515 Ma), probably developed during the initial episodes of the early Paleozoic rifting affecting the N margin of Gondwana. The remaining Mesoproterozoic, Paleoproterozoic and Archean zircon grains would have been contributed by Paleoproterozoic basement and/or older continental crust recycled in the western sections of the Gondwana margin. We suggest that this domain is probably part of the autochthonous section of the Central Iberian Zone (CIZ) and derived from the Saharan Metacraton and/or Tuareg Shield.

References

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Published

2023-06-05

How to Cite

Solis Alulima, B., Abati Gómez, J., López Carmona, A., Gutiérrez Alonso, G., & Fernández Suárez, J. (2023). Geochronology and detrital zircons sources from the Sierra Albarrana Domain (SW Iberian Massif). GEOGACETA, 73, 71–74. https://doi.org/10.55407/geogaceta95417

Issue

Vol. 73 (2023): January-June

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Artículos

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