The Messinian volcaniclastic layers of the Northern Apennines:evidence for the initial phases of the Southern Tyrrhenian spreading?
- TRUA, Teresa
- MANZI, Vinicio
- ROVERI, Marco
- ARTONI, Andrea
DOIAbstract
A petrological investigation has been carried out on the Late Miocene (around 5.5 Ma) volcaniclastic layer interbedded in the uppermost Messinian deep-water sediments of the Northern Apennines foredeep basin. The studied samples derive from five sections located on a 200 km long area and reveal that the volcaniclastic layer corresponds to centimetric- to metric-thick turbiditic sequence, essentially composed of lapilli to ash-sized glass shards and scarce (<5%) mineral fragments. The homogeneous chemical composition of the glass shards (calc-alkaline rhyolite) and crystals (plagioclase, sanidine, biotite) suggests a cogenetic origin for the studied samples. In these samples non-volcanic detritus is absent and the morphology of th...
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