Partition coefficients in basalts and basaltic andesites

The several sets of REE data shown are generally in good agreement with each other. There is however a strong oimpositional effect on the Kd for the REE in 

Colson er al. (1988) in a detailed study of trace element partitioning between olivine and silicic melt, and orthopyroxene and silicic melt, have shown that many partition coefficients are strongly dependent upon temperature and melt composition. They show that these partition coefficients vary according to ionic size and they have modelled temperature and composition dependence as a function of these variables. On the basis of their equations it is possible to predict partidon coefficients between olivine and melt, and orthopyroxene and melt, for a wide range of tri- arid di-valent cations under a7yiriety of magmatic conditions. 

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