Molybdenum isotope evidence for forearc mantle recycling at the Tongan subduction zone

Qasid Ahmad , Martin Wille , Stephan König , Carolina Rosca , Angela Hensel , Thomas Pettke & Jörg Hermann
Molybdenum isotope ratios (δ98/95Mo) of marine sediments constitute an important tracer for paleoredox reconstructions of the ancient ocean. Due to its redox-sensitivity, significant mass-dependent Mo isotope fractionation is induced in present-day low temperature environments leading to distinct Mo concentrations and isotope compositions in different marine lithologies. Subduction and recycling of such fractionated material can thus be potentially traced in arc magmas. Indeed, Mo isotope variations are observed in mafic arc lavas that are attributed to...
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