LaRocheCalc {GCDkit} | R Documentation |
Recalculates whole-rock data into R1-R2 values of De La Roche et al. (1980).
LaRocheCalc(rock=WR)
rock |
a numeric matrix with whole-rock data to be recalculated. |
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
results |
numeric matrix with the two above specified parameters |
Vojtech Janousek, vojtech.janousek@geology.cz
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