Petrology and Geochemistry

Although scattered, major and trace element variations for the Vulsini rocks define overall trends that support an evolution dominated by fractional crystallisation starting from different types of parental melts. Holm et al. (1982) suggested that the evolution of HKS magmas was dominated by fractional crystallisation with separation of olivine and clinopyroxene in the mafic range, and of variable proportions of clinopyroxene, leucite, pla- 

The variable compositions of mafic rocks at likely reflect the occurrence of different types of parental liquids, which are characterised by distinct enrichment in potassium and incompatible elements. The positive correlation of potassium vs. incompatible elements and the lack of systematic differences in isotopic compositions between potassic and ultrapotas-sic rocks are suggestive of a magma genesis by different degrees of partial melting in a broadly common mantle source. This is supported by the similar REE and incompatible element patterns of all the mafic rocks (Fig. 4.8). Also the melilite-bearing rocks from Montefiascone share these 

---

Ishizuka, H., Kawanobe, Y. and Sakai, H. (1990) Petrology and geochemistry of volcanic rocks dredged from the Okinawa Trough and active back-arc basin. Geochem. J., 24, 75-92. 

Smith DR, Noblett J, Wobus RA, Unruh D, Douglass J, Beane R, Davis C, Goldman S, Kay G, Gustavson B, Saltoun B, Stewart J (1999) Petrology and geochemistry of late-stage intrusions of the A-type, mid-Proterozoic Pikes Peak batholith (Central Colorado, USA) implications for petrogenetic models. 

Norman, D.K., Parry, W.T., Bowman, J.R. 1991. Petrology and Geochemistry of Propylitic Alteration at Southwest Tintic, Utah. Economic Geology, 86, 13-28. 

Spalletti, L.A., Merodio, J.C., Matheos, S.D. 2008. Sedimentary petrology and geochemistry of siliciclastic rocks from the upper Jurassic Tordillo Formation (Neuque n Basin, western Argentina) Implications for provenance and tectonic setting. Journal of South American Earth Sciences, 25, 440-463. 

Sulfide petrology and geochemistry of the Key Anacon Main Zone and East Zone massive sulfide deposits, Bathurst Mining Camp, NB, Canada... 

Traber, D., Mader, U. Eggenberger, U. 2002. Petrology and geochemistry of a municipal solid waste incinerator residue treated at high temperature. Schweizerische Mineralogische und Petrographische Mitteilungen, 82, 1-14. 

Shao, L., Jones, T., Gayer, R., Dai, S., Li, S. Jiang, Y. 2003. Petrology and geochemistry of the high-sulphur coals from the Upper Permian carbonate coal measures in the Hesham Coalfield, southern China. International Journal of Coal Geology, 55, 1 -26. 

SIEVER (R.), 1959. Petrology and geochemistry of silica cementation in some Pennsylvanian sandstones. Soc. Econ. Pal. Min. Special Pub. 55-79. 

Di Battistini G, Montanini A, Zerbi M (1990) Geochemistry of volcanic rocks from southeastern Montiferro. Neues Jahrb Mineral Abh 162 35-67 Di Battistini G, Montanini A, Vemia L, Bargossi GM, Castorina F (1998) Petrology and geochemistry of ultrapotassic rocks from the Montefiascone volcanic complex (Central Italy) magmatic evolution and petrogenesis. Lithos 43 169-195... 

---