silica-undersaturatedrocks from the Roccamonfinacomplex of the Roman Volcanic Region, Italy, may be partially explained...found in the Roman Volcanic Region, Italy. Several authors have suggestedthat the volcanic seriesin this region...P(H2O)=P(tot) high-K lavasplottedin termsof the Fig. 2. Roccamonfina systemQ-An-Lc. Field boundariesat P(H,O) : I...Appleton (1972) discussed 900/0, (p),leucite(l), and sanidine(s) the fractionation trend observed in the high-K...pointswherefieldsofplagioclase the Roccamonfina volcanic complex, Italy, in terms of coexistin the topo
will appreciate that this problem is extremely complex, particularly since this relationship forms the...produced in the calculation of extremely subsilicic volcanic rocks have recently been briefly discussed by...calculation. The new scheme was originally applied to volcanic rocks only, but was later modified and extended...between the mode and the chemical composition of volcanic rocks. At the request of G. B. EscHER, then president...that the solution of the problem was much more complex than had initially appeared. The results of experimental