Hai-Quan Liu, Jie Li, Thierry Calmus, Alfredo Aguillón-Robles, Le Zhang, Long Zhang, Xiao-Long Huang, Yi-Gang Xu
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Radiogenic and Stable Isotope Evidence for Recycling of Ancient Oceanic Crust in High-Nb Basalts From Baja California, Mexico
The genesis of high-Nb basalts (HNB) in subduction zones remains controversial, attributed to melting products of metasomatized mantle linked to recent or ancient subduction events. Here we present radiogenic isotope and molybdenum compositions for post-subduction HNBs and adakites from Baja California, Mexico. The HNBs show more radiogenic Sr-Pb and less unradiogenic Nd-Hf isotopes compared to the adakites. Their Mo isotopic enrichment (δ98/95Mo), up to −0.12‰ relative to the depleted mantle (−0.21‰), is linked to FOZO (Focal Zone)-like Sr-Nd-Hf-Pb isotopic signatures. These features indicate compositional contribution of recycled, ancient oceanic crust (>1 Gyr), carrying heavy Mo under reduced conditions through serpentinite-related interactions and losing varying amounts of Rb, Nd, Hf, and Pb relative to bulk oceanic crust during subduction dehydration. Our new data reveal ancient contributions to HNB formation and underscore the role of subducted oceanic crust and serpentinite to the formation of FOZO mantle signatures.
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Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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