Analysis of isotope data from the Azores Islands provides evidence for deep recycling of material that had undergone fractionation near the Earth's surface. It is though that this component is from melt- and fluid-depleted lithospheric mantle and is 2.5 billion years old, whereas other Azores basalts have been estimated to contain from ∼3 billion-year-old melt-enriched basalt.
- Simon Turner
- Sonia Tonarini
- Bruce F. Schaefer
