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An experimental investigation of hydroxyl solubility in jadeite and Na-rich clinopyroxenes

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Abstract

The solubility and incorporation mechanisms of water in synthetic, water-saturated jadeite and Na-rich clinopyroxenes have been experimentally investigated. Infrared spectra for water-saturated jadeite synthesised from 2.0 to 10 GPa show two prominent sharp peaks at 3,373 and 3,613 cm−1 together with several weaker features in the OH-stretching region, indicating that there are at least 5 distinct modes of hydrogen incorporation in the structure. Water solubility in pure jadeite reaches a maximum of about 450 ppm by weight at 2 GPa and slowly decreases with increasing pressure to about 100 ppm at 10 GPa. Solubility can be described by the function cOH=A f H2O 0.5 exp (–PΔV Solid/RT), where cOH is water solubility in ppm H2O by weight, A is 7.144 ppm/bar0.5, f H2O is water fugacity, and ΔV Solid=8.019 cm3/mol is the volume change of the clinopyroxene upon incorporation of OH. Jadeite provides a good model for understanding hydrogen incorporation mechanisms in more complex omphacite compositions. Assignment of absorption bands in IR spectra verifies the importance of cation vacancies on the M2 site in providing mechanisms for hydrogen incorporation. However, results also suggest that substitution of lower valency cations onto the M1 site may also be important. Solid solution of jadeite with diopside and in particular, with Ca-Eskola component leads to a drastic increase of water solubility, and the bulk composition has a more important effect on the capacity of omphacite to store water than pressure and temperature. Omphacite is expected to be the major carrier of water in a subducted eclogite after the breakdown of hydrous minerals.

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Acknowledgements

The authors would like to thank Dan Frost for help with multi-anvil experiments, Hubert Schulze for sample preparation, Georg Herrmansdörfer and Heinz Fischer for manufacturing components for piston-cylinder and multi-anvil apparatus and Detlef Kauße for assistance with EMPA. This manuscript benefited greatly from detailed reviews by R. Oberti and R. Stalder. This work was supported by the EU Hydrospec network (Improving Human Potential Programme).

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Authors and Affiliations

  1. Bayerisches Geoinstitut, Universität Bayreuth, 95440 , Bayreuth, Germany

    Geoffrey David Bromiley

  2. Institut für Geowissenschaften, Universitaet Tübingen, 72074 , Tübingen, Germany

    Hans Keppler

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  1. Geoffrey David Bromiley
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  2. Hans Keppler
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Correspondence to Geoffrey David Bromiley.

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Editorial responsibility: W. Schreyer

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Bromiley, G.D., Keppler, H. An experimental investigation of hydroxyl solubility in jadeite and Na-rich clinopyroxenes. Contrib Mineral Petrol 147, 189–200 (2004). https://doi.org/10.1007/s00410-003-0551-1

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