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Thermodynamic assessment of the magmatic history of Blue Rock shield volcano, Jackson Co., Oregon: application of a new DNi (olivine-melt) geothermometer and other models

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Abstract

Blue Rock is a basaltic shield volcano in the southern Oregon Cascades, north of Mt. McLoughlin, showing bulk phenocryst abundances ranging from 5 to 28 vol%, and a variety of groundmass textures. Compositional analyses of olivine and plagioclase phenocrysts and glomerocrysts allowed for the sequential application of a new \( {D}_{\mathrm{Ni}}^{\mathrm{olivine}-\mathrm{melt}} \) thermometer, a plagioclase-melt hygrometer, and a viscosity model to define olivine-in conditions for a suite of lavas erupted from this edifice. Calculated olivine-in temperatures were compared to results from the anhydrous MELTS model, and the D (Mg) model of Beattie (1993). Model results were consistent with experimental data for hydrous arc basalts with respect to temperature (1053–1146 °C), dissolved-H2O contents (0.9–2.4 wt% H2O), and viscosity (1.9–2.2 log10 Pa s), confirming the utility of these models in assessing the thermodynamic properties of mafic, hydrous arc lavas over a broad range in crystallinity, requiring only the completion of bulk geochemical and microprobe analyses. These studies also reinforced the significant and predictable role of water, affecting the compositions of crystals grown during magmatic ascent, and allowed the definition of a reasonable multi-stage eruptive sequence consistent with the degassing of magmas on ascent in the formation of this small-scale basaltic edifice.

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Acknowledgements

Field work, bulk geochemical analyses, and thin-section manufacture were funded by a Grant-in-Aid of Research, Artistry and Scholarship Program through the University of Minnesota (#22608), and by the Howard Hughes Medical Institute, Precollege and Undergraduate Science Education Program 2012 Grants to Primarily Undergraduate Institutions (#52007564). Microprobe analyses were funded by the National Science Foundation (EAR-1551344)

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  1. Division of Science & Mathematics, Geology Discipline, University of Minnesota - Morris, 600 E. 4th St, Morris, MN, 56267, USA

    Stephen M. Crabtree, Abigail Huber & Karl Beck

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  1. Stephen M. Crabtree
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  2. Abigail Huber
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  3. Karl Beck
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Correspondence to Stephen M. Crabtree.

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Editorial responsibility: J.E. Gardner and V.S. Kamenetsky

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Crabtree, S.M., Huber, A. & Beck, K. Thermodynamic assessment of the magmatic history of Blue Rock shield volcano, Jackson Co., Oregon: application of a new DNi (olivine-melt) geothermometer and other models. Bull Volcanol 79, 35 (2017). https://doi.org/10.1007/s00445-017-1115-y

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