Patrones de tierras raras y estudio isotópico preliminar del caolín asociado a un paleosuelo laterítico del suroeste peninsular

  1. J.C. Fernández-Caliani 1
  2. M. Cantano 1
  1. 1 Universidad de Huelva
    info

    Universidad de Huelva

    Huelva, España

    ROR https://ror.org/03a1kt624

Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2016

Issue Title: IX CONGRESO GEOLÓGICO DE ESPAÑA

Issue: 16

Pages: 391-394

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

This study reports the concentrations and fractionation patterns of rare-earth elements (REE) in a lateritic paleosol developed on arkosic sands (Bonares Sands Formation) since the Late Pliocene in South-West Spain, and it explores the stable isotope signature of the kaolin in order to constrain the paleoweathering event. The kaolinized material appears to be markedly impoverished in REE, showing relatively flat patterns with little fractionation (LaN/LuN<2) and irrelevant europium anomalies (Eu/Eu*=0.8-1.3). The isotope composition of the kaolinite (δ18O=17.3‰ and δD=-65‰) is consistent with a supergene origin. Kaolin was formed in equilibrium with meteoric waters under (sub)tropical weathering conditions.

Data source: Dialnet