Petrological and Geological Data of Porphyritic Dikes from the Capo Arco Area (Eastern Elba Island, Northern Tyrrhenian Sea)
Per. Mineral. (2006), 75, 2-3, 241-254 http://go.to/permin An International Journal of O PERIODICO di MINERALOGIA MINERALOGY, CRYSTALLOGRAPHY, GEOCHEMISTRY, established in 1930 ORE DEPOSITS, PETROLOGY, VOLCANOLOGY and applied topics on Environment, Archaeometry and Cultural Heritage Petrological and geological data of porphyritic dikes from the Capo Arco area (Eastern Elba Island, northern Tyrrhenian Sea) Enrico Pandeli1,2*, Alba P. Santo1,2*, Marco Morelli1,3, Letizia Orti1,3 1 Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, I - 50121 Firenze 2 CNR - Isituto di Geoscienze e Georisorse, Via La Pira 4, I - 50121 Firenze 3 Museo di Scienze Planetarie, Via Galcianese 20/N, I - 59100 Prato Abstract. — New geological surveying at a the studies rocks, possibly a result of secondary 1:10.000 scale (CARG Project) allowed to refine the processes. Sr-Nd isotopic ratios for the two outcrops stratigraphic, structural and magmatic setting of the of the studied dikes show significant differences, with Elba Island. This paper aims at characterizing two 87Sr/86Sr = 0.711845 and 0.711769 and 143Nd/144Nd = dikes of likely Late Miocene age (Casa Carpini dikes), 0.512223 and 0.512246. The Casa Carpini dikes are previously defined as lamprophyres (i.e. kersantite), petrographically different from most of the dike rocks outcropping in eastern Elba, on the eastern and associated to the granitoid plutons and laccoliths southern slopes of the Monte Arco, close to Porto of the Elba Island. Instead, analogies can be found Azzurro. The grey to light-grey Casa Carpini dikes, with the granodiorites to quartz-monzodiorite Orano the phyllites and metasandstones of the Ligurian- porphyries, the last magmatic products of western Piedmontese Acquadolce Unit, are quartz-diorites Elba.
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