Post-depositional processes of elemental enrichment inside dark nodular masses of an ancient aeolian dune from A Coruña, Northwest Spain

Authors

  • M.J. TRINDADE Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa. EN10, 2686-953 Sacavém, Portugal. GeoBioTec Research Centre, Universidade de Aveiro. Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
  • M.I. PRUDÊNCIO Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa. EN10, 2686-953 Sacavém, Portugal. GeoBioTec Research Centre, Universidade de Aveiro. Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
  • J.S. SÁNCHEZ Instituto Universitario de Xeoloxía, Campus de Elviña, Universidade da Coruña.. A Coruña, España.
  • J.R. VIDAL ROMANÍ Instituto Universitario de Xeoloxía, Campus de Elviña, Universidade da Coruña.. A Coruña, España.
  • T. FERRAZ Instituto Nacional de Engenharia, Tecnologia e Inovação. Estrada do Paço do Lumiar 22, 1649-38 Lisboa, Portugal.
  • D. FERNÁNDEZ MOSQUERA Instituto Universitario de Xeoloxía, Campus de Elviña, Universidade da Coruña.. A Coruña, España.
  • M.I. DIAS Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa. EN10, 2686-953 Sacavém, Portugal. GeoBioTec Research Centre, Universidade de Aveiro. Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.

DOI:

https://doi.org/10.1344/105.000001838

Keywords:

Dune, Manganese, Oxidation, Trace elements, Weathering

Abstract

This paper focuses on a residual ancient aeolian climbing dune from Punta Penaboa (A Coruña, Northwest Spain) showing evidence of post-depositional weathering, particularly the presence of dark brown nodular masses. The partitioning of trace elements between nodular masses and host sand during post-depositional weathering of the dune is investigated in this work, with the main objective of studying the elemental enrichment patterns in the dark masses. Data of the concentrations of chemical elements were obtained by instrumental neutron activation analysis (INAA) and complemented by mineralogical and microchemical studies, using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) / energy dispersive X-ray spectrometry (EDS). The dune was dated by optically stimulated luminescence (OSL) , yielding an age of 300ka B.P.. The dark nodular masses preserved the dune sand structure, without defined concentric layers, suggesting an early stage of formation. They consist mainly of quartz grains cemented by clay materials enriched in the majority of the elements studied, especially in Mn, Co, Ba, Sb, Ce, Tb, Th, As, Zr and Hf. The post-depositional transformations of the dune were most likely influenced by migration of chemical compounds from the surrounding slope deposits and granitic rocks, as well as microbial activity that promoted metals concentration in the solutions percolating through the pore network of the dune. Seasonal changes in the redox potential were required to produce the accumulation of Mn and other trace elements in the dune pore network and to promote the fractionation between Ce4+ and trivalent rare earth elements that was observed in the geochemical patterns.

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2023-10-26

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