Higher pressure differentiation of arc magmas under thicker crust.

Strictly speaking, since Tang I et al. i [[3]] focused on continental arc magmatism which was generated under a pre-existing continental crust, their results are more relevant to the evolution, I rather than i the origin, of continental crust. For instance, if garnet fractionation is the primary driver in increasing Mg# of continental calc-alkaline magmas, the process would also concomitantly raise the La/Yb ratio and decrease Yb due to garnet being a major carrier of heavy rare earth elements. The formation of continental crust is pivotal to understanding the evolution of the earth and its habitability. [Extracted from the article]