Articles | Volume 35, issue 4
https://doi.org/10.5194/ejm-35-665-2023
https://doi.org/10.5194/ejm-35-665-2023
Research article
 | 
21 Aug 2023
Research article |  | 21 Aug 2023

First measurements of the Fe oxidation state of spinel inclusions in olivine single crystals from Vulture (Italy) with the in situ synchrotron micro-Mössbauer technique

Giulia Marras, Gabriele Carnevale, Antonio Caracausi, Silvio Giuseppe Rotolo, and Vincenzo Stagno

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Cited articles

Arai, S.: Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation, Chem. Geol., 113, 191–204, 1994. 
Avé Lallemant, H. G. and Carter, N. L.: Syntectonic recrystallization of olivine and modes of flow in the upper mantle, Geol. Soc. Am. Bull., 81, 2203e2220, https://doi.org/10.1130/0016-7606(1970)81[2203:SROOAM]2.0.CO;2, 1970. 
Ballhaus, C., Berry, R. F., and Green, D. H.: High pressure experimental calibration of the olivine-orthopyroxene-spinel oxygen geobarometer: implications for the oxidation state of the upper mantle, Contrib. Mineral. Petr., 107, 27–40, 1991. 
Bell, D. R., Rossman, G. R., Maldener, J., Endisch, D., and Rauch, F.: Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum, J. Geophys. Res.-Sol. Ea., 108, 2105, https://doi.org/10.1029/2001JB000679, 2003. 
Berry, A. J., O'Neill, H. S. C., Jayasuriya, K. D., Campbell, S. J., and Foran, G. J.: XANES calibrations for the oxidation state of iron in a silicate glass, Am. Mineral., 88, 967–977, 2003. 
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Short summary
We present the first determinations of the Fe oxidation state of tiny spinel inclusions (<40 µm) in olivine from a wehrlitic lapillus collected at Mt. Vulture (Italy) via in situ synchrotron Mössbauer spectroscopy. These data, along with the chemistry of olivine and (rare) orthopyroxene, allowed us to calculate the logfO2 of the wehrlitic sample. This study opens the possibility to retrieve the redox state of mantle xenoliths using the Fe3+ / ∑Fe and chemistry of spinel inclusions in olivine.