Results show that the Hengill volcano is primarily a production anomaly of olivine tholeiites but still there are small amounts of evolved rocks much higher then found in any part of the Reykjanes peninsula.
Niðurstöður sýna að Hengilseldstöðin framleiðir aðallega ólivín-þóleiít en einnig þróaðra berg sem finnst ekki á Reykjanesskaga.