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Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites. (Articolo in rivista)
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- Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites. (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
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Cesare B., Meli S., Nodari L., Russo U. (2005)
Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites.
in Contributions to mineralogy and petrology
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- Cesare B., Meli S., Nodari L., Russo U. (literal)
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- Titolo
- Fe3+ reduction during biotite melting in graphitic metapelites: another origin of CO2 in granulites. (literal)
- 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 (01% 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. (literal)
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