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Although it has long been argued that evolution of the Jurassic Ferrar tholeiites involves crustal assimilation processes (fractional crystallisation or AFC; e.g. Hoefs etal. 1980; Mensing etal.1984), in the past two decades a general consensus has emerged that certain trace element features observed in the most primitive lavas cannot be product of crustal-level processes (e.g. Kyle 1980; Hergt etal...
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