Laroche {GCDkit}R Documentation

R1-R2 diagram (De la Roche et al. 1980)

Description

Assigns data for the R1-R2 diagram into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'.

Usage

LarocheVolc()

LarochePlut()

Details

R1-R2 plot, as proposed by De La Roche et al. (1980) for volcanic, as well as plutonic rocks.

Larochevolc.png

volcanic rocks plutonic rocks
trachyphonolite nepheline syenite
phonolite nepheline syenite
phono-tephrite essexite
tephrite essexite
alkali rhyolite alkali granite
qtz.trachyte qtz.syenite
trachyte syenite
rhyolite granite
qtz.latite qtz.monzonite
rhyodacite granodiorite
dacite tonalite
andesite diorite
lati-andesite monzodiorite
latite monzonite
mugearite syenodiorite
nephelinite ijolite
andesi-basalt gabbro-diorite
lati-basalt monzogabbro
hawaiite syenogabbro
tholeiite gabbronorite
basalt gabbro
alkali basalt alkaligabbro
basanite theralite
ankaratrite melteigite
picritic rock ultramafic rock

Larocheplut.png

Value

sheet

list with Figaro Style Sheet data

x.data

R1 = 4 * Si - 11 * (Na + K) - 2 * (Fe[total as bivalent] + Ti), all in millications; as calculated by the function 'LaRocheCalc()'

y.data

R2 = 6 * Ca + 2 * Mg + Al, all in millications; as calculated by the function 'LaRocheCalc()'

Author(s)

Vojtech Erban, vojtech.erban@geology.cz
& Vojtech Janousek, vojtech.janousek@geology.cz

References

De La Roche H, Leterrier J, Grandclaude P, & Marchal M (1980) A classification of volcanic and plutonic rocks using R1R2- diagram and major element analyses - its relationships with current nomenclature. Chem Geol 29: 183-210 doi: 10.1016/0009-2541(80)90020-0

See Also

classify figaro LaRocheCalc millications plotDiagram

Examples

#Within GCDkit, the plot is called using following auxiliary functions:
#To classify data stored in WR (Groups by diagram)
classify("LarocheVolc") 
#or 
classify("LarochePlut")

#To plot data stored in WR or its subset (menu Classification)
plotDiagram("LarocheVolc", FALSE) 
#or
plotDiagram("LarochePlut", FALSE)

[Package GCDkit version 4.0 Index]