Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

Goltz, Andrea E.; Krawczynski, Michael J.; McCanta, Molly C.; Dyar, M. Darby

doi:10.2138/am-2022-8031

Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

Journal Article · 01 November 2022 · American Mineralogist

DOI:https://doi.org/10.2138/am-2022-8031· OSTI ID:2423426

; Krawczynski, Michael J.; ; Dyar, M. Darby

Abstract

Oxygen fugacity is an important but difficult parameter to constrain for primitive arc magmas. In this study, the partitioning behavior of Fe3+/Fe2+ between amphibole and glass synthesized in piston-cylinder and cold-seal apparatus experiments is developed as an oxybarometer, applicable to magmas ranging from basaltic to dacitic composition. The partitioning of Fe2+ is strongly dependent on melt polymerization; the relative compatibility of Fe2+ in amphibole decreases with increasing polymerization. The Fe2+/Mg distribution coefficient between amphibole and melt is a relatively constant value across all compositions and is, on average, 0.27. The amphibole oxybarometer is applied to amphibole in mafic enclaves, cumulates, and basaltic tephra erupted from Shiveluch volcano in Kamchatka with measured Fe3+/FeTotal. An average Fe3+/Fe2+ amphibole-glass distribution coefficient for basalt is used to convert the Fe3+/FeTotal of amphibole in samples from Shiveluch to magmatic oxygen fugacity relative to NNO. The fO2 of primitive melts at the volcano is approximately NNO+2 and is faithfully recorded in amphibole from an amphibole-rich cumulate and the basaltic tephra. Apparently, higher fO2 recorded by amphibole in mafic enclaves likely results from partial dehydrogenation of amphibole during residence in a shallow andesite storage region. We identify three pulses of mafic magma recharge within two weeks of, a month before, and two to three months before the eruption and find that, at each of these times, the host andesite was recharged by at least two magmas at varying stages of differentiation. Application of the amphibole oxybarometer not only gives insight into magmatic fO2 but also potentially details of shallow magmatic processes.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 2423426

Journal Information:: American Mineralogist, Journal Name: American Mineralogist Journal Issue: 11 Vol. 107; ISSN 0003-004X

Publisher:: Mineralogical Society of America

Country of Publication:: United States

Language:: English

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A possible effect of melt structure on the Mg-Fe2+ partitioning between olivine and melt Kushiro, Ikuo; Mysen, Bjorn O. Geochimica et Cosmochimica Acta, Vol. 66, Issue 12 https://doi.org/10.1016/S0016-7037(01)00835-3	journal	June 2002
A Mössbauer-based XANES calibration for hydrous basalt glasses reveals radiation-induced oxidation of Fe Cottrell, Elizabeth; Lanzirotti, Antonio; Mysen, Bjorn American Mineralogist, Vol. 103, Issue 4 https://doi.org/10.2138/am-2018-6268	journal	April 2018
Trace-Element Partitioning Between Amphibole and Silicate Melt Tiepolo, M.; Oberti, R.; Zanetti, A. Reviews in Mineralogy and Geochemistry, Vol. 67, Issue 1 https://doi.org/10.2138/rmg.2007.67.11	journal	October 2007
The Petrology of Plutonic Blocks and Inclusions from the Lesser Antilles Island Arc Arculus, R. J.; Wills, K. J. A. Journal of Petrology, Vol. 21, Issue 4 https://doi.org/10.1093/petrology/21.4.743	journal	November 1980
The influence of magmatic differentiation on the oxidation state of Fe in a basaltic arc magma Kelley, Katherine A.; Cottrell, Elizabeth Earth and Planetary Science Letters, Vol. 329-330 https://doi.org/10.1016/j.epsl.2012.02.010	journal	May 2012
Hydrous phase equilibria of a Mexican high-silica andesite:A candidate for a mantle origin? Blatter, Dawnika L.; Carmichael, Ian S. E. Geochimica et Cosmochimica Acta, Vol. 65, Issue 21 https://doi.org/10.1016/S0016-7037(01)00708-6	journal	November 2001
Compositional gaps in igneous rock suites controlled by magma system heat and water content Melekhova, Elena; Annen, Catherine; Blundy, Jon Nature Geoscience, Vol. 6, Issue 5 https://doi.org/10.1038/ngeo1781	journal	April 2013

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