Il Giacimento di bentonite di S'Aliderru ed i suoi rapporti con l'evoluzione delle paleosuperfici della Nurra (Sardegna nord-occidentale)

The bentonite ore deposit of S'Aliderru is situated in Nurra, an interesting area where the continental conditions continue from early tertiary. This is the most important white bentonite mineralization in Italy and one of the best in Europe. The local lithological sequence is the following: Jurassic limestones as the basament, several oligocenic layers of volcanic ashes, and the covering constituted by gravels of the pediments formed in the interstadial age. It's ore body risen after alterations of cineritic deposits accumulated on the tertiary paleomorphology in a mio-pliocenic age. The entire area is presently subject to intense exploration for a complete study of this paleomorphology and its later evolution.