| Cox {GCDkit} | R Documentation |
Assigns data for Cox's diagram into Figaro template (list 'sheet') and
appropriate values into 'x.data' and 'y.data'.
CoxVolc(alkline=TRUE) CoxPlut(alkline=TRUE)
alkline |
Logical: Should the boundary between alkaline and subalkaline rocks (Irvine & Baragar 1971) be drawn? |
TAS diagram, as proposed by Cox et al. (1979) for volcanic rocks and adapted by Wilson (1989) for plutonic rocks.
For volcanic rocks, the following diagram is plotted:
And the version for plutonic rocks contains the following fields:
| volcanic rocks | plutonic rocks |
| basalt | gabbro |
| basaltic andesite | undefined |
| andesite | diorite |
| dacite | quartz diorite (granodiorite) |
| rhyolite | alkali granite/granite |
| hawaiite | gabbro |
| trachyandesite | undefined |
| basanite/tephrite | undefined |
| mugearite | syeno-diorite |
| benmoreite | syenite |
| trachyte | syenite |
| nephelinite | ijolite |
| phonology nephelinite | undefined |
| phonolitic tephrite | undefined |
| phonolite | nepheline syenite |
sheet |
list with Figaro Style Sheet data |
x.data |
SiO2 weight percent |
y.data |
Na2O+K2O weight percent |
Note that, unlike in the standard TAS plot, the diagram is based on standard analyses (i.e. it is not recalculated on the volatile-free basis).
Vojtěch Erban, erban@sopky.cz
& Vojtěch Janoušek, vojtech.janousek@geology.cz
Cox KG, Bell JD & Pankhurst (1979) The Interpretation of Igneous Rocks. Allen & Unwin, London
Irvine TM & Baragar WR (1971) A guide to the chemical classification of common volcanic rocks. Canad J Earth Sci 8: 523-548 doi: 10.1139/e71-055
Wilson M (1989) Igneous Petrogenesis. Chapman & Hall, London
classify figaro plotDiagram TAS
sampleDataset("sazava")
# TAS diagram is called using following auxiliary functions:
# Classifies data stored in WR (Groups by diagram)
classify("CoxVolc")
#or
classify("CoxPlut")
#Plots data stored in WR or its subset (menu Classification)
plotDiagram("CoxVolc", FALSE)
#or
plotDiagram("CoxPlut", FALSE)