Protolito

Il protolito indica la litologia precedente al metamorfismo di una roccia metamorfica. L'etimologia del termine deriva dal greco antico πρωτο (prōto)= primo, e λίθος (líthos)= pietra, a indicare la pietra originaria da cui deriva la roccia in questione.

Le rocce metamorfiche derivano dalla trasformazione di rocce preesistenti, hanno quindi una roccia da cui derivano: ad esempio uno gneiss può derivare dalla trasformazione di un protolito granitico.

Il protolito può essere una roccia magmatica, sia intrusiva che effusiva, sedimentaria o anche già metamorfica, sia isochimica che metasomatica. Solo le rocce sedimentarie evaporitiche e alcune rare magmatiti alcaline sembrano non essere presenti tra i protoliti.^[1]

Note

^ Myron G. Best, Igneous and metamorphic petrology, 2nd edition - Blackwell, 2003 pag. 424

Voci correlate

Metamorfismo

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