Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots

نویسندگان

چکیده

Abstract The thick mantle lithosphere beneath cratons consists of strongly reduced rocks that have reacted with oxidized melts. These low-silica, incipient melts are rich in CO 2 and H O react surrounding forming an enriched zone at the base lithosphere, which is source region for many diamonds. Here, we reproduce these reactions novel experiments oxidised, hydrous carbonate-rich reduced, depleted peridotite 5 GPa pressure. Results explain several key features sample kimberlites as products a single process, namely formation diamonds, phlogopite alkali-amphibole bearing rocks, iron-rich dunites, garnets clinopyroxenes pyroxenitic compositions. Initially, redox freezing occurs where meet peridotite, depositing diamonds associated garnet clinopyroxenes. spreading reaction front leaves behind Fe-rich dunite, crystallizing amphibole when melt solidifies front.

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ژورنال

عنوان ژورنال: Communications earth & environment

سال: 2022

ISSN: ['2662-4435']

DOI: https://doi.org/10.1038/s43247-022-00630-3