Molybdenum isotopes in plume-influenced MORBs reveal recycling of ancient anoxic sediments
Under modern oxidising Earth surface conditions, dehydrated subducted slabs show Mo
isotope compositions as low as δMo=− 1.5%, compared to the depleted mantle δMo=−
0.2%. Such light Mo isotope compositions reflect the redox-dependent aqueous mobility of
isotopically heavy Mo associated with slab dehydration. Here we analysed basaltic glasses
from the South-Mid Atlantic Ridge, whose parental melts are influenced by the enriched
Discovery and Shona mantle plumes. We report increasingly higher δMo of up to− 0.1 …
isotope compositions as low as δMo=− 1.5%, compared to the depleted mantle δMo=−
0.2%. Such light Mo isotope compositions reflect the redox-dependent aqueous mobility of
isotopically heavy Mo associated with slab dehydration. Here we analysed basaltic glasses
from the South-Mid Atlantic Ridge, whose parental melts are influenced by the enriched
Discovery and Shona mantle plumes. We report increasingly higher δMo of up to− 0.1 …
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