LaRocheCalc {GCDkit}R Documentation

Calculation: De la Roche

Description

Recalculates whole-rock data into R1-R2 values of De La Roche et al. (1980).

Usage

LaRocheCalc(rock=WR,precision=getOption("gcd.digits"))

Arguments

rock

a numeric matrix with whole-rock data to be recalculated.

precision

precision of the result.

Details

R1-R2 parameters, as proposed by De La Roche et al. (1980):

R1 = 4 * Si - 11 * (Na + K) - 2 * (Fe[total as bivalent] + Ti), all in millications R2 = 6 * Ca + 2 * Mg + Al, all in millications

Value

results

numeric matrix with the two above specified parameters

Author(s)

Vojtěch Janoušek, 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

LaRoche

Examples

    data(blatna)
    accessVar("blatna")
    
    LaRocheCalc()

[Package GCDkit version 6.1 Index]