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Samoa offers clues to early Earth
24-oct-2014 - SamoaObserver.

Samoan volcanoes have yielded evidence of the planet’s early formation still trapped inside the Earth.

Known as hotspots, volcanic island chains such as Samoa can have ancient primordial signatures from the early solar system that have somehow survived billions of years.

Matthew Jackson, an associate professor in the department of Earth science at University of California, Santa Barbara, and colleagues utilized high-precision lead and helium isotope measurements to unravel the chemical composition and geometry of the deep mantle plume feeding Samoa’s volcanoes. Their findings appear in Nature.