Ballard_et_al_Zircon    Zircon Rare earth Element Data from Ballard et
                        al. 2001 and 2002.
CleanColnames           Clean variable names that have prefixes or
                        suffixes
Element_Data            Element data for calculations
Element_norm            Calculate normalized values for a list of
                        elements
REE_Elements            Rare earth element list
REE_plus_Y_Elements     Rare earth element list
add_ID                  Add_ID
add_IonicRadii          Add Chondrite or Mantle values for
                        normalization.
add_NormValues          Add Chondrite or Mantle values for
                        normalization.
add_element_data        Add ionic radius and chondrite and mantle
                        values, Z and Mass
calc_all                Calculate and Impute REE missing data and
                        anomalies.
correct_heavy           Corrects for the model deviations of Er, Yb, Lu
                        and Y
correct_middle          Corrects for the model deviations of Yb, Lu and
                        Y
element_denorm          Denormalize chrodrite Normalize to ppm
impute_REE              Impute Rare earth elements
modelChondrite_Onuma    Model REE contents using the Chondrite-Onuma
                        method of Carrasco-Godoy and Campbell (2023)
modelChondrite_lattice
                        Model REE contents using the Chondrite-Lattice
                        method of Carrasco-Godoy and Campbell (2023)
modelZhong              Model REE contents using the method of Zhong et
                        al. (2019)
model_REE               Model REE + Y contents using different methods.
