Abstract
Abstract We report here the widespread occurrence of mantle peridotites in both suboceanic and subcontinental lithosphere that show trace element characteristics similar to those of island arc volcanics. These anhydrous peridotites, which reside at high levels in the mantle, cannot generate nor be in equilibrium with mid-ocean ridge or ocean island basalts, and have complex geochemical histories involving partial melting, melt extraction and metasomatism.
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