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Clinopyroxene–liquid thermometers and barometers specific to alkaline differentiated magmas

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Abstract

We present new thermometers and barometers based on clinopyroxene–liquid equilibria specific to alkaline differentiated magmas. The new models were calibrated through the regression analyses of experimental datasets obtained by merging phase equilibria experiments from the literature with new experiments performed by using trachytic and phonolitic starting compositions. The regression strategy was twofold: (1) we have tested previous thermometric and barometric equations and recalibrated these models using the new datasets; (2) we have calibrated a new thermometer and a new barometer including only regression parameters that closely describe the compositional variability of the datasets. The new models yield more precise estimates than previous thermometers and barometers when used to predict temperatures and pressures of alkaline differentiated magmas. We have tested the reliability of the new equations by using clinopyroxene–liquid pairs from trachytes and phonolites erupted during major explosive eruptions at the Phlegrean Fields and Mt. Vesuvius (central Italy). The test yielded crystallization conditions comparable to those determined by means of melt and fluid inclusion analyses and phase equilibria studies; this validates the use of the proposed models for precise estimates of crystallization temperatures and pressures in differentiated alkaline magmas. Because these magmas feed some of the most voluminous, explosive, and threatening volcanic eruptions in the world, a better understanding of the environmental conditions of their reservoirs is mandatory and this is now possible with the new models provided here.

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Acknowledgments

We are grateful to Keith D. Putirka, an anonymous reviewer, and the editor Timothy L. Grove for their useful comments. Tracy Paul is acknowledged for providing experimental materials and technical support during the experimental work. Bob Myhill is acknowledged for thoughtful input to this manuscript. A. Cavallo is acknowledged for assistance during electron microprobe analysis. This work was funded by Sapienza—Università di Roma, Istituto Nazionale di Geofisica e Vulcanologia, and Depths of the Earth Company. SM was supported by ERC Starting Grant 259256 GLASS project.

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Authors and Affiliations

  1. Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany

    M. Masotta

  2. Dipartimento di Scienze della Terra, Sapienza Università di Roma, Rome, Italy

    M. Masotta & M. Gaeta

  3. Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy

    S. Mollo, C. Freda & M. Gaeta

  4. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA

    G. Moore

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  1. M. Masotta
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  2. S. Mollo
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Correspondence to M. Masotta.

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Communicated by T. L. Grove.

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Masotta, M., Mollo, S., Freda, C. et al. Clinopyroxene–liquid thermometers and barometers specific to alkaline differentiated magmas. Contrib Mineral Petrol 166, 1545–1561 (2013). https://doi.org/10.1007/s00410-013-0927-9

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