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
data(sazava) accessVar("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)