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Basalts tend normally to form at mid-ocean ridges or at inter plate hotspots. However a specific type of Basalt known as Boninite which has a high silica and magnesium content and which is formed in the fore-arc and back-arc basins of subduction zones. This however is NOT a primary basalt.

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13y ago
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Q: Can you get primary basalt at subduction zone?
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