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The application of olivine geothermometry to infer crystallization temperatures of parental liquids: Implications for the temperature of MORB magmas

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Falloon, TJ, Danyushevsky, LV, Ariskin, AA, Green, DH and Ford, CE 2007 , 'The application of olivine geothermometry to infer crystallization temperatures of parental liquids: Implications for the temperature of MORB magmas' , Chemical Geology, vol. 241 , pp. 207-233 , doi: 10.1016/j.chemgeo.2007.01.015.

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Abstract

We have performed a detailed evaluation of three olivine geothermometers for anhydrous systems representing three different
approaches to modelling olivine-melt equilibrium. The Ford et al. [Ford, C. E., Russell, D. G., Craven, J.A., Fisk, M. R., 1983.
Olivine-liquid equilibria: Temperature, pressure and composition dependence of the crystal/liquid cation partition coefficients for
Mg, Fe2+, Ca and Mn. J. Petrol., 24, 256–265.] geothermometer describes olivine liquidus temperature as a function of melt
composition and pressure, and the composition of the liquidus olivine as a function of melt composition, pressure and temperature.
The Herzberg and O'Hara [Herzberg, C., O'Hara, M.J., 2002. Plume-associated ultramafic magmas of Phanerozoic Age. Journal of
Petrology, 43, 1857–1883.] geothermometer describes olivine liquidus temperature similarly to Ford et al. [Ford, C. E., Russell,
D. G., Craven, J.A., Fisk, M. R., 1983. Olivine-liquid equilibria: Temperature, pressure and composition dependence of the crystal/
liquid cation partition coefficients for Mg, Fe2+, Ca and Mn. J. Petrol., 24, 256–265.], and olivine composition as function of melt
composition only. The Putirka [Putirka, K.D., 2005. Mantle potential temperatures at Hawaii, Iceland, and the mid-ocean ridge
system, as inferred from olivine phenocrysts: evidence for thermally driven mantle plumes, Geochem. Geophys. Geosyst., 6,
Q05L08, doi:10.1029/2005GC000915.] geothermometer describes both olivine liquidus temperature and composition as function
of melt composition only. A comparison of these three geothermometers with experimental data at 0.1 MPa and 1.5 GPa reveals
that the Ford et al. [Ford, C. E., Russell, D. G., Craven, J.A., Fisk, M. R., 1983. Olivine-liquid equilibria: Temperature, pressure
and composition dependence of the crystal/liquid cation partition coefficients for Mg, Fe2+, Ca and Mn. J. Petrol., 24, 256–265.]
geothermometer is the most successful in reproducing experimental temperatures and olivine-melt KD's. We therefore recommend
that the Ford et al. [Ford, C. E., Russell, D. G., Craven, J.A., Fisk, M. R., 1983. Olivine-liquid equilibria: Temperature, pressure
and composition dependence of the crystal/liquid cation partition coefficients for Mg, Fe2+, Ca and Mn. J. Petrol., 24, 256–265.]
olivine geothermometer be used in parental liquid calculations that involve the incremental addition of olivine to obtain equilibrium
with a target olivine phenocryst composition at low pressure. The thermometer of Putirka [Putirka, K.D., 2005. Mantle potential
temperatures at Hawaii, Iceland, and the mid-ocean ridge system, as inferred from olivine phenocrysts: evidence for thermally driven mantle plumes, Geochem. Geophys. Geosyst., 6, Q05L08, doi:10.1029/2005GC000915.] was found to systematically calculate anomalously high temperatures for high MgO experimental compositions at both 0.1 MPa and 1.5 GPa. The application of the Ford et al. [Ford, C. E., Russell, D. G., Craven, J.A., Fisk, M. R., 1983. Olivine-liquid equilibria: Temperature, pressure and composition dependence of the crystal/liquid cation partition coefficients for Mg, Fe2+, Ca and Mn. J. Petrol., 24, 256–265.]geothermometer to calculate the temperatures of crystallization for parental MORB liquids in mid-crustal magma chambers reveals
that there is an ∼115 °C temperature range. The hottest MORB parental liquids have crystallisation temperatures of ∼1345 °C
(MgO contents ∼16 wt.%) for a mid-crustal pressure of 0.2 Gpa.

Item Type: Article
Authors/Creators:Falloon, TJ and Danyushevsky, LV and Ariskin, AA and Green, DH and Ford, CE
Keywords: Olivine; Geothermometers; Temperature; MORB; Hawaii; Mantle plumes
Journal or Publication Title: Chemical Geology
DOI / ID Number: 10.1016/j.chemgeo.2007.01.015
Additional Information:

Leonid Danyushevsky, David Green

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