Xphoenix
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#1
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So the volcano lies on a constructive plate boundary- and hence we would expect a Shield volcano due to the type of lava.

However, the volcano is a Stratovolcano/Composite, which would mean a different type of lava typically found on destructive plate boundaries.

Can someone explain how/why this is the case?
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Friffinghell
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https://www.theguardian.com/environm...tions-answered

Some good answers here from a geologist.
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Hattie55
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As far as I know, Eyjafjallajokull is a composite volcano due to the ice cap which covers it. Due to its proximity to the Mid Atlantic Ridge where the Eurasian and North American plates are moving apart, the main type of lava which is erupted is basalt.

Where the ground is ice-free (around the ice cap and where the ice has melted), the basalt erupts as relatively fluid lava, often as fire fountains through fissures and craters. However, where the basalt erupts beneath the ice cap, the lava interacts with the ice to produce 'phreatomagmatic' eruptions, which are highly explosive and produce large volumes of steam and ash.

These two eruptive styles produce the layers of lava and ash which build up to form a composite volcano.
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Hattie55
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Composite volcanos often occur at destructive plate margins however I think that means that there is a possibility that a composite volcano could occur at a constructive, but it's just rarer?
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