Multicomponent diffusion in basaltic melts

Details Multicomponent diffusion in basaltic melts Multicomponent diffusion in basaltic melts

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59..313k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 2, pp.313-324

Computer Science

6

Scientific paper

Experimental results are presented for eighteen experiments exploring multicomponent chemical-diffusion in basaltic liquids. Experiments were performed in Columbia River Basalt (CRB) composition doped with about 5 wt% SiO 2 , TiO 2 , Al 2 O 3 , FeO, MgO, and CaO, under reducing conditions at 1 atm., at 1473 K, 1573 K, and 1723 K. Results indicate that diffusion behavior in CRB compositions is consistent with a simple Fick's law formulation. This Fickian behavior in CRB compositions contrasts with more complicated diffusion behavior observed in MgO---Al 2 O 3 ---SiO 2 and CaO---MgO---Al 2 O 3 ---SiO 2 melts. Results of CRB experiments are combined to calibrate a diffusion matrix ( D ) in CRB liquids at 1473 K, 1573 K, and 1723 K. Our D estimates indicate negative coupling between CaO and both FeO and Al 2 O 3 components, though diagonal elements still dominate. These general features persist across the temperature range considered. Self- and tracer-diffusion data from the literature are used with the predictive model of Richter (1993) to estimate a D matrix at 1573 K. The resulting matrix does not compare well with our measured 1573 K diffusion matrix. It cannot be established if this discrepancy indicates a failure of the Richter (1993) model, or merely reflects deficiencies in the available tracer- and self-diffusion data, or limitations in the melt activity model. Effective Binary Diffusion Coefficients (EBDC) were also estimated for TiO 2 , Al 2 O 3 , FeO, MgO, and CaO at 1473 K, 1573 K, and 1723 K. These EBDC estimates are used to constrain a polythermal Arrhenian model for the prediction of EBDC values at super-liquidus temperatures. Results of experiments on alkali diffusion in CRB compositions are included to add Na 2 O and K 2 O to the polythermal EBDC model.

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