Opx-Cpx: Putirka, 2009 RiMG

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Global regression, based on the partitioning of enstatite + ferrosilite (Fm2Si2O6 = EnFs; FmO = FeO + MgO + MnO) between clinopyroxene and orthopyroxene. Cpx with Mg#>0.75.

Details

Calculate
Article	Keith D. Putirka Thermometers and Barometers for Volcanic Systems, Mineralogy & Geochemistry Vol. 69 pp. 61-120, 2008
Reference	putirka2008.pdf
Collibration	487 points with Mg# in Cpx >0.75 from large dataset
Presition	± 46 °C
Ranges	P < 70 kbar, 700 °C < T < 2000 °C
Renew sensors	Brey and Köhler (1990) model T(BKN)

Source

source('recalc_px_putirka.r');
source('interpmin_opx_thompson.r');
source('interpmin_cpx_putirka.r');

sensors.p.opx_cpx_putirka <- function(Opx, Cpx, T=1000, usePFU = FALSE, ...){

stopifnot(usePFU == F);

CpxCmp <-interpmin.cpx_putirka(Cpx);
Cpx <- recalc.px_putirka(Cpx);

OpxCmp <- interpmin.opx_thompson(Opx);
Opx <- recalc.px_putirka(Opx);

Pcalc <- 10^4/(11.2-1.96*log(CpxCmp$X_EnFs/OpxCmp$X_Fm2Si2O6)-3.3*Cpx$Ca_pfu-25.8*CpxCmp$X_CrCaTs+33.2*Opx$Mn_pfu-23.6*Opx$Na_pfu-2.08*OpxCmp$X_En-8.33*OpxCmp$X_Di-0.05*P);

Eq_check <- (Cpx$Fe_pfu/Cpx$Mg_pfu)/(Opx$Fe_pfu/Opx$Mg_pfu);

Eq_check <- Eq_check > 0.95 && Eq_check < 1.23;

return (data.frame(Name=paste0(Opx$Name,'-',Cpx$Name),T_seq=T,P_calc_Opx_Cpx_Putirka=Pcalc,Eq_check=Eq_check));
}

sensors.t.opx_cpx_putirka.args <- function() {
    ars <- list();
    ars$minerals = c('Opx','Cpx');
    ars$ranges = c('T');
    return(ars);
}