Distribución de uranio y torio en la apófisis adamellítica de Logrosán (Cáceres, España)
DOI:
https://doi.org/10.3989/egeol.86426768Keywords:
Adamellite, uranium, thorium, Logrosán.Abstract
Logrosan apophyses (Cáceres, España) has two differents petrographic types: a porphyritic two mica adamellite and a porphyritiv two mica microadamellite. It's an alkaline with silico-sodic trend and peraluminous granitoid. A greisen alteration has been produced by the tin-veins in the host-rock.
The moderatly high content values of uranium are ranged between 6.9 and 11.9 ppm, with a mean of 9.5 ppm. Thorium has lower concentrations levels. The Th/U ratio has an average value of 0.8.
The fact that thorium ís correlated positivels with ferromagnesian elements indicates that is probably contained within the boitites.
Higher thorium and uranium values are founded in the adamellite type.
Greisen has produced an uranium leaching that would be important as uranium mineralization source outside the apophyses. Although has not been observed uranium mineralizations in the geological area study.
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