Chlorite-talc mineralisations in central Sardinia, Italy.

The discovery of important albitite deposits near the already known talc-chlorite deposits of central Sardinia reopened discussion about the genesis of these deposits. It was commonly agreed that Mg had been supplied by limestones, even though these rocks are not abundant in the area. Taking into account the volume of albitised rocks, their mean Mg content and the distribution of the newly formed silicates, it appears that the Mg displaced by Na-metasomatism could produce the assessed quantity of magnesium silicates.
The discovery of important albitite deposits near the already known talc-chlorite deposits of central Sardinia reopened discussion about the genesis of these deposits. It was commonly agreed that Mg had been supplied by limestones, even though these rocks are not abundant in the area. Taking into account the volume of albitised rocks, their mean Mg content and the distribution of the newly formed silicates, it appears that the Mg displaced by Na-metasomatism could produce the assessed quantity of magnesium silicates.