The lava is ancient - from the Reykjavík Grapevine:
Lava From Geldingadalur Is The Most Primitive Iceland Has Seen In 7000 Years
Magnús Tumi Guðmundsson, professor of geophysics, has spoken about the results of the research done on the lava flowing from Geldingadalur and states that is it very exciting, Vísir reports.
The results of the studies conducted show that the lava that is emerging from the volcano is likely the most primitive lava the surface of Iceland has seen for over 7,000 years.
Something different going on - the magma is coming from much deeper in the Earth.
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