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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/127/08/0118

    • Keywords

       

      Provenance; heavy minerals; beach sediments; fossil placer; geochemistry; Annaba/Algeria

    • Abstract

       

      The paper presents the first study of heavy-mineral sand beaches from the Mediterranean coast of Annaba/Algeria. The studied beaches run along the basement outcrops of the Edough massif, which are mainly composed by micaschists, tourmaline-rich quartzo-feldspathic veins, gneisses, skarns and marbles. Sand samples were taken from three localities (Ain Achir, Plage-Militaire and El Nasr). The heavy-mineral fraction comprises between 74 and 91 vol%. The garnets of the beaches are almandine rich and tourmalines vary with respect to their location from schorl to dravite. Tourmaline at Ain Achir and the Plage-Militaire is schorlits, while at El Nasr beach dravite is ubiquitous. The World Shale Average normalised REE of the sands and the basement outcrops reveal: (i) Ain Achir beach: REE pattern of sand and the coastal rocks from the studied beaches reflects a multiple sources; (ii) Plage-Militaire: the sand and the coastal outcrops show similar LREE and a strong enrichment in HREE, suggesting the presence HREE-rich phases found as inclusions in staurolite; (iii) El Nasr: two types of sand patterns are found: one with flat REE pattern similar to the proximal rocks and other one enriched in HREE suggesting a mixed source.

    • Author Affiliations

       

      Asma Chemam1 Soraya Hadjzobir2 Menana Daif1 Uwe Altenberger3 Christina Gunter3

      1. Laboratory of LGRN, Badji-Mokhtar/Annaba University, P.O. Box 12, 23000 Annaba, Algeria.
      2. Laboratory of Soils and Sustainable Development, Badji-Mokhtar/Annaba University, P.O. Box 12, 23000 Annaba, Algeria.
      3. Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D14476 Potsdam-Golm, Germany.
    • Dates

       
  • Journal of Earth System Science | News

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