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

• Published in: Chemical Geology
• Main Authors: Falloon, Trevor, Danyushevsky, Leonid V., Ariskin, A, Green, David, Ford, Clifford
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Elsevier
• Subjects: Keywords: chemical composition; crystallization; geothermometry; ion exchange; magma chamber; magmatic differentiation; mid-ocean ridge basalt; olivine; P-T conditions; phase equilibrium; temperature effect; Hawaii [United States]; North America; United States Geothermometers; Hawaii; Mantle plumes; MORB; Temperature; Craven; Iceland
• Online Access: http://hdl.handle.net/1885/39462; https://doi.org/10.1016/j.chemgeo.2007.01.015; https://openresearch-repository.anu.edu.au/bitstream/1885/39462/5/CG241_207.pdf.jpg; https://openresearch-repository.anu.edu.au/bitstream/1885/39462/7/01_Falloon_The_application_of_olivine_2007.pdf.jpg

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 ...