Carbon fluxes from subducted carbonates revealed by uranium excess at Mount Vesuvius, Italy
Carbon fluxes from subducted carbonates revealed by uranium excess at Mount Vesuvius, Italy
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意大利维苏威火山铀过剩揭示了俯冲碳酸盐的碳通量
DOI:
10.1130/g39766.1
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发表时间:
2018
期刊:
影响因子:
5.8
通讯作者:
Avanzinelli R
中科院分区:
文献类型:
--
作者:
Avanzinelli R
The fate of carbonate-rich sediments recycled at destructive plate margins is a key issue for constraining the budget of deep CO2supplied to the atmosphere by volcanism. Experimental studies have demonstrated that metasomatic melts can be generated by partial melting of subducted carbonate-pelitic sediments, but signatures of the involvement of such components in erupted magmas are more elusive. We have made new U-Th disequilibria, Sr-Nd-Pb isotope, and high-precision δ238U analyses on lavas from Mount Vesuvius (Italy) and show that their measured238U excesses require a mantle source affected by the addition of U-rich carbonated melts, generated by partial melting of subducted calcareous sediments in the presence of residual epidote. Accordingly, we argue that the occurrence of238U excesses in “sediment-dominated” arc magmas represents diagnostic evidence of addition of carbonate sediments via subduction, hence providing constraints on deep carbon cycling within Earth. Our quantitative enrichment model, combined with published experimental results, allows us to estimate a resulting flux of 0.15–0.8 Mt/yr CO2from the subducted carbonates to the mantle source of Mount Vesuvius.
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