(Alpe Arami, Gorduno, Bellinzona, Riviera, Ticino (Tessin), Svizzera (Schweiz; Suisse))
Outcrops of garnet lherzolite from mantle transition zone (300-450 km deep).
Olivine with ilmenite (intermediary phase between ilmenite and perovskite) exsolutions might result from the destabilization of ringwoodite or wadsleyite.
Refs.:
- Bocchio, R., Ungaretti, L., and Rossi, G. (1978) Crystal chemical study of eclogitic amphiboles from Alpe Arami, Lepontine Alps, southern Switzerland. Soc. Ital. Mineral. Petrol. Rend.: 34: 453-470.
- Science, 2 April 1999, Vol. 284.
- Paquin, J. and Altherr, R. (2002) Subduction-related lithium metasomatism during exhumation of the Alpe Arami ultrahigh-pressure garnet peridotite (Central Alps, Switzerland). Contributions to ineralogy and Petrology: 143: 623-640.
- Paquin, J., Altherr, R., and Ludwig, T. (2004) Li-Be-B systematics in the ultrahigh-pressure garnet peridotite from Alpe Arami (central Swiss Alps): implications for slab-to-mantle wedge transfer. Earth Planet. Sci. Lett.: 218: 507-519.
