1. Corso di Petrografia Corso di Laurea in Geologia Escursione ai vulcani Vulsini

14. Pietre Lanciate, near the Bolsena Village, is an example of a basaltic lava flow with well developed columnar jointing. These structures are generated by volume contraction of the lava body during cooling. Figure 3

15. Formation of the Bolsena Caldera Figure 5

16. Formation of an ignimbritic plateau A – Pyroclastic cloud flowing along a valley B – Deposition of pyroclastic material and formation of a welded tuff C – Relief inversion by erosion of soft bedrocks (e.g. clay) Figure 9

17. Pyroclastic flow tuff (ignimbrite) Fallout tuffs Figure 10

18. Phreatomagmatic eruptions occur when magmas and water came into contact Figure 12

19. Rock Geochemistry

20. LaSrHf Zr Sm Oceanic basalts Ta Nb CeNd Pb P Ti Tb Y F Ba Rb Th K U Rock/Bulk Earth Limestone Vulsini magmas Figure 14

21. line Vulsini Subducting Adriatic continental plate Subducting Ionian Plate Subduction of Adriatic and Ionian plates beneath the Italian pensinsula is responsible for magmatism in central and southern Italy Figure 16

22. Figure 17