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. %] |
Vojtech Janousek, vojtech.janousek@geology.cz
Sylvester P J (1989) Post-collisional alkaline granites. J Geol 97: 261-280. doi: 10.1086/629302
#plot the diagram plotDiagram("Sylvester", FALSE)