Harker diagrams for trace elements: (a) Zr, (b) Th, (c) La, (d) Yb and (e) Y. The metatexites show a slight decrease in the content of these trace elements as SiO₂ increases. Diatexites show the same pattern, except that some mesocratic and leucocratic diatexites show a higher abundance of these trace elements between 68 and 74 wt % SiO₂. Some leucogranites also show enrichment of these trace elements over the same SiO₂ range.