Cox {GCDkit}R Documentation

TAS diagram (Cox et al. 1979)

Description

Assigns data for Cox's diagram into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'.

Usage

CoxVolc(alkline=TRUE)

CoxPlut(alkline=TRUE)

Arguments

alkline

Logical: Should the boundary between alkaline and subalkaline rocks (Irvine & Baragar 1971) be drawn?

Details

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: Coxvolc.png

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

Coxplut.png

Value

sheet

list with Figaro Style Sheet data

x.data

SiO2 weight percent

y.data

Na2O+K2O weight percent

Warning

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).

Author(s)

Vojtěch Erban, erban@sopky.cz
& Vojtěch Janoušek, vojtech.janousek@geology.cz

References

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

See Also

classify figaro plotDiagram TAS

Examples

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)

[Package GCDkit version 6.1 Index]