This post is a compilation of the exercises from Chapter 3: Classical Plots from the book Geochemical Modelling of Igneous Processes - Principles and Recipes in R language by Vojtěch Janoušek, Jean Hervé Martin, Vojtěch Erban and Colin Farrow.

We download the precompiled data of adakite from GEOROC database. For a simple impression of adakite, the wikipedia page gives some clue: Adakites are volcanic rocks of intermediate to felsic composition that have geochemical characteristics of magma thought to have formed by partial melting of altered basalt that is subducted below volcanic arcs.