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Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites

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Abstract

The Fe3+/Fetot of all Fe-bearing minerals has been analysed by Mössbauer spectroscopy in a suite of biotite-rich to biotite-free graphitic metapelite xenoliths, proxies of an amphibolite-granulite transition through progressive biotite melting. Biotite contains 9 to 16% Fe3+/Fetot, whereas garnet, cordierite and ilmenite are virtually Fe3+ -free (0–1% Fe3+/Fetot) in all samples, regardless of biotite presence. Under relatively reducing conditions (graphite-bearing assemblages), biotite is the only carrier of Fe3+ during high-temperature metamorphism; therefore, its disappearance by melting represents an important event of iron reduction during granulite formation, because haplogranitic melts usually incorporate small amounts of ferric iron. Iron reduction is accompanied by the oxidation of carbon and the production of CO2, according to the redox reaction:

$$ 2{\text{Fe}}_2 {\text{O}}_3^{({\text{Bt}})} + {\text{C}}^{({\text{Gr}})} \Rightarrow 4{\text{FeO}}^{({\text{Crd}},{\text{Grt}},{\text{Ilm}},{\text{Opx}})} + {\text{CO}}_2^{({\text{fluid}},{\text{melt}},{\text{Crd}})} . $$

Depending on the nature of the peritectic Fe-Mg mineral produced (garnet, cordierite, orthopyroxene), the CO2 can either be present as a free fluid component, or be completely stored within melt and cordierite. The oxidation of graphite by iron reduction can account for the in situ generation of CO2, implying a consequential rather than causal role of CO2 in some granulites and migmatites. This genetic model is relevant to graphitic rocks more generally and may explain why CO2 is present in some granulites although it is not required for their formation.

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Acknowledgements

Funding was provided by the University of Padova (Fondi Progetti Ricerca 2002) and Consiglio Nazionale delle Ricerche (Westmed Euromargins European Science Foundation Eurocore). We thank S. Harley and J. Touret for their thoughtful reviews, J. Connolly, E. Essene, L. Hollister, S. Intento, P. Nimis, and M. Satish-Kumar for comments on an earlier version of the manuscript, R. Carampin and F. Zorzi for assistance with microprobe analysis and X-ray diffractometry, respectively.

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Correspondence to Bernardo Cesare.

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Cesare, B., Meli, S., Nodari, L. et al. Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites. Contrib Mineral Petrol 149, 129–140 (2005). https://doi.org/10.1007/s00410-004-0646-3

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