4. Ultra-potassic magmas in the Italian and Indonesian volcanic arcs. Currently a 'sleeping topic' but some data collection is still ongoing on samples from Muriah volcano, Java, and on Italian rocks.

Italian Picture

Publications:
VP-1. Barton, M., Varekamp, J.C. and van Bergen, M.J., 1982: Complex zoning of clinopyroxenes in the lavas of Vulsini, Latium, Italy: Evidence for magma mixing. J. Volc. Geoth. Res., 14, 361-388.
VP-2. Varekamp, J.C., 1983: The significance of mafic nodules in the ultra-potassic rocks from Italy, a discussion. J. Volc. Geoth. Res., 16, 161-165.
VP-4. Varekamp, J.C., and Kalamarides, R., 1989: Hybridization processes in leucite tephrites from Vulsini (Italy), and the evolution of the Italian potassic suite. J. Geophys. Res., 94, B4, 4603-4618.
VP-7. VanBergen, M.J., Vroon, P.Z., Varekamp, J.C., and Poorter R.P.E., 1992: The origin of the potassic rock suite of Batu Tara (East Sunda Arc, Indonesia). Lithos 28, 261-282.