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Petrography and geochemistry of Cretaceous to quaternary siliciclastic rocks in the Tarfaya basin, SW Morocco: implications for tectonic setting, weathering, and provenance

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Abstract

The petrography, heavy mineral analysis, major element geochemical compositions and mineral chemistry of Early Cretaceous to Miocene–Pliocene rocks, and recent sediments of the Tarfaya basin, SW Morocco, have been studied to reveal their depositional tectonic setting, weathering history, and provenance. Bulk sediment compositional and mineral chemical data suggest that these rocks were derived from heterogeneous sources in the Reguibat Shield (West African Craton) including the Mauritanides and the western Anti-Atlas, which likely form the basement in this area. The Early Cretaceous sandstones are subarkosic in composition, while the Miocene–Pliocene sandstones and the recent sediments from Wadis are generally carbonate-rich feldspathic or lithic arenites, which is also reflected in their major element geochemical compositions. The studied samples are characterized by moderate SiO2 contents and variable abundances of Al2O3, K2O, Na2O, and ferromagnesian elements. Binary tectonic discrimination diagrams demonstrate that most samples can be characterized as passive continental marginal deposits. Al2O3/Na2O ratios indicate more intense chemical weathering during the Early Cretaceous and a variable intensity of weathering during the Late Cretaceous, Early Eocene, Oligocene–Early Miocene, Miocene–Pliocene and recent times. Moreover, weathered marls of the Late Cretaceous and Miocene–Pliocene horizons also exhibit relatively low but variable intensity of chemical weathering. Our results indicate that siliciclastics of the Early Cretaceous were primarily derived from the Reguibat Shield and the Mauritanides, in the SW of the basin, whereas those of the Miocene–Pliocene had varying sources that probably included western Anti-Atlas (NE part of the basin) in addition to the Reguibat Shield and the Mauritanides.

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Acknowledgments

We thank RWE Dea for funding this project. We also thank ONHYM for supporting, organizing, and accompanying the field campaign in March–April, 2009, and drilling in September–December, 2009. Dr. Peter Appel, Institute of Geosciences, Univ. Kiel, is grateful for his support in the geochemical analytical work. We are also very thankful to Prof. Wolf-Christian Dullo for constructive editorial comments and to Prof. Hilmar won Eynatten and one anonymous reviewer for in depth reviews that helped us to improve the manuscript.

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Authors and Affiliations

  1. Institute of Geosciences, Christian-Albrechts-University, 24118, Kiel, Germany

    Sajid Ali, Karl Stattegger, Dieter Garbe-Schönberg & Wolfgang Kuhnt

  2. RWE Dea AG, Hamburg, Germany

    Oliver Kluth

  3. ONHYM, Rabat, Morocco

    Haddou Jabour

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  1. Sajid Ali
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  2. Karl Stattegger
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Correspondence to Sajid Ali.

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Ali, S., Stattegger, K., Garbe-Schönberg, D. et al. Petrography and geochemistry of Cretaceous to quaternary siliciclastic rocks in the Tarfaya basin, SW Morocco: implications for tectonic setting, weathering, and provenance. Int J Earth Sci (Geol Rundsch) 103, 265–280 (2014). https://doi.org/10.1007/s00531-013-0965-6

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