Rare earth distribution and its correlation with clay mineralogy in the clay size fraction of
Cretacic and Pliocenic sediments, Central Portugal … Rare earth distribution and its
correlation with clay mineralogy in the clay size fraction of Cretacic and Pliocenic sediments,
Central Portugal Other title Répartition des terres rares et corrélation avec la minéralogie des
argiles dans la fraction argileuse de sédiments crétacés et pliocènes du Portugal central (fr) …

The REE contents in the clay-sized fractions of nineteen Cretaceous and Pliocene
continental sediments, Portugal, were found to be correlated with kaolinite. No correlation is
apparent between clay mineralogy and La/Lu or Eu/Sm ratios. The Eu anomaly is generally
smaller (or even absent) in the clay-sized fraction than in the corresponding whole sediment,
probably due to a greater ability of the clay minerals to accommodate Eu (as Eu2+) rather
than the other REE released during weathering.