| Sylvester {GCDkit} | R Documentation | 
Assigns data for a binary plot 
(Al2O3+CaO)/(FeOt+Na2O+K2O)
vs. 100*(MgO+FeOt+TiO2)/SiO2, 
proposed by Sylvester (1989) to distinguish the 
alkaline collision-related alkaline granites
into Figaro template (list 'sheet') and appropriate values 
into 'x.data' and 'y.data'.  
Sylvester()
In the plot (Al2O3+CaO)/(FeOt+Na2O+K2O) vs. 100*(MgO+FeOt+TiO2)/SiO2 of Sylvester (1989) can be distinguished 'Alkaline'collision-related granites, from 'Calc-alkaline & Strongly peraluminous' types (solid line). The strongly fractionated calc-alkaline varieties are separated by the dashed line.
 
 
 
Note that only samples with SiO2 > 68 wt. % are plotted.
| sheet | list with Figaro Style Sheet data | 
| x.data | (Al2O3+CaO)/(FeOt+Na2O+K2O) [wt. %] | 
| y.data | 100*(MgO+FeOt+TiO2)/SiO2 [wt. %] | 
Vojtěch Janoušek, vojtech.janousek@geology.cz
Sylvester P J (1989) Post-collisional alkaline granites. J Geol 97: 261-280. doi: 10.1086/629302
    sampleDataset("blatna")
    
    # plot the diagram
    plotDiagram("Sylvester", FALSE)