Intrusion of basaltic and trachytic dykes in volcanic rocks from Middle Miocene (Porto Santo island, Portugal).

Intrusão de diques basálticos e traquíticos em rochas vulcânicas do Miocénico Médio (ilha de Porto Santo, Portugal).

Photo: Prof.  Mário Cachão.

Francisco Sousa

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Sayantan Saha said... May 19, 2017 at 7:26 AM

I really hope you know that basalt is an extrusive rock that cannot form dykes by definition. Calling them dolerite dykes on the other hand would do them justice.