https://exhibits.lafayette.edu/omeka/files/original/3dbe93dfde884a3b5238d0fc8727093d.pdf

Media

Part of Ocean Island Basalt Setting: Azores Islands

Description

In contrast with the ternary diagram for the Austral Cook Volcanic chain, this ocean island basalt has characteristics just on the borderline between being classified as tholeiitic and calc-alkaline.