Cenozoic Volcanism in the Tyrrhenian Sea Region by Angelo Peccerillo

By Angelo Peccerillo

This is an up to date variation of the e-book via a similar writer: "Plio-Quaternary volcanism in Italy - Petrology, geochemistry, geodynamics," released in 2005 through Springer. This variation has a similar constitution because the past booklet, with a normal creation; numerous chapters devoted to varied volcanic provinces in Italy; and a last bankruptcy at the relationships among magmatism and geodynamics. It contains details that has turn into to be had within the final ten years, and new chapters were extra providing exact discussions of the Oligo-Miocene orogenic volcanism on Sardinia and of a few small outcrops of fragmented volcanic rocks taking place in different areas of the Apennines. This re-creation now covers the complete Tyrrhenian Sea magmatism of the final forty Ma. finally, it comprises appendices: Appendix 1 is an replace of the 2005 version appendix. Appendix 2 discusses the fundamental rules of igneous petrology, hint components and isotope geochemistry, delivering geoscientists surprising with petrology-geochemistry insights into how significant hint parts and isotopic facts on volcanic rocks permit a greater knowing of magmatism and geodynamics.

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5 REE patterns of selected silicic a and mafic b rocks from Tuscany. Normalising values are from Sun and McDonough (1989) (*An85-45) and biotite are found in some lavas. Plagioclase phenocrysts are strongly zoned (about An80 to An30 from core to rim), with the highest anorthite contents being found in the rocks that contain latite enclaves. Alkali feldspar (Or56–78) shows minute inclusions of biotite and plagioclase. Biotite occurs as phenocryst and groundmass phase in the rhyolites and in the latite enclaves.

Such a particular type of source in Tuscany probably formed during the Late Cretaceous to Eocene subduction of the European plate beneath the African margin. Partial melting of subduction mélange took place much later, during the Miocene to present opening of the northern Tyrrhenian Sea behind the west dipping and eastward retreating Adriatic subducting slab. Age polarity of Tuscany magmatism reflects the timing of backarc extension that migrated from west to the east. Keywords Á Á Á Á Tuscany magmatism Crustal anatexis Granitoids Calcalkaline magmas Lamproites Adakite Mantle contamination Subduction mélange Northern Apennines Geodynamics Á Á © Springer International Publishing AG 2017 A.

They span the alkali feldspar granite to diorite field, according to Q’ANOR classification scheme of Streckeisen and Le Maitre (1979); granodiorites and monzogranites are largely dominating rock types, whereas mafic samples exclusively occur as microgranular enclaves within plutonic rocks (Fig. 2b). Several acid intrusive and extrusive rocks show a peraluminous character (Alumina Saturation Index, ASI1 > 1) Mafic rocks are mostly represented by dikes, lavas, and enclaves. They are generally saturated to oversaturated in silica, and show variable enrichments in potassium and K2O/Na2O ratios, from calcalkaline to ultrapotassic (Fig.

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