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American Mineralogist; April 2007; v. 92; no. 4; p. 670-674; DOI: 10.2138/am.2007.2484
© 2007 Mineralogical Society of America
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The effect of H2O on olivine crystallization in MORB: Experimental calibration at 200 MPa

Renat R. Almeev1,*, François Holtz1, Jürgen Koepke1, Fleurice Parat2 and Roman E. Botcharnikov1

1 Institut für Mineralogy, Universität Hannover, Callinstrasse 3, Hannover, 30167, Germany
2 Mineralogisches Institut, Im Neuenheimer Feld 236, Heidelberg, 69120, Germany

Correspondence: * E-mail: r.almeev{at}mineralogie.uni-hannover.de

Crystallization experiments were conducted at 200 MPa and water-undersaturated conditions to quantify the effect of small amounts of H2O on the crystallization temperature of olivine in basaltic melts (e.g., Mid-Oceanic Ridge Basalts, MORB).The H2O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer-Titration, ranged between 0.25 and 4.2 wt% H2O. The dry liquidus temperature was estimated from experiments at 0.1 MPa (H2O-free) and from the known pressure dependence of olivine crystallization temperature. The liquidus temperature depression can be predicted by the empirical equation (TDRY – TWET) = 39.69·CH2O 0.73(wt%). The comparison of the experimental results with available crystallization models and empirical methods shows that most of the predicted liquidus temperature depressions differ significantly from that observed in this study.

Key Words: Crystallization • H2O • MORB • olivine • liquidus • FTIR • KFT




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