New experiments and empirical model of CO₂ solubility over a large range of silica-undersaturated composition.

CO₂ solubility decreases with increasing amount of network forming cations.

Strong non-linear solubility behaviour of transitional melts retaining large amount of CO₂ up until shallow depth.

CO₂ solubility behaviour explains morphological features of kimberlite pipes, notably the depth extent of the root zone.