Cpx-Spl: Mercier, 1980 <A>

Independent estimation of pressure and temperature for any single pyroxene phase in equilibrium with a second pyroxene and with either spinel or garnet; otherwise, minimum temperatures and maximum pressures are obtained.

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source("utilities_tpf.r");

sensors.t.cpx_spl_mercier_1980_a <- function(Cpx, usePFU = FALSE, ...){

    row_name = Cpx$Name;

    if(!usePFU) {
        Cpx <- tpf.recalc_minaral("CPX",Cpx);
    }

    A <- (Cpx$Al_c4_pfu + Cpx$Al_c6_pfu - Cpx$Na_pfu) / 2;
    W <- Cpx$Ca_pfu / (Cpx$Ca_pfu + Cpx$Mg_pfu + Cpx$Fe_p2_pfu + Cpx$Fe_p3_pfu + Cpx$Mn_pfu);
    FCR <- Cpx$Cr_pfu / (Cpx$Al_c4_pfu + Cpx$Al_c6_pfu + Cpx$Cr_pfu - Cpx$Na_pfu);
    XKW <- (1 - 2 * W) / (0.667 + 0.667 * W);
    XKA <- A / (1 - A) / (1 - 1.27 * FCR)^2;
    D <- log(XKA) * log(XKW) - 11.2724 * log(XKW) + 2.2595 * log(XKA) + 32.371;
    T <- (61152 - 7537.5 * log(XKW)) / D - 273.15;
    
    return(data.frame(Name=row_name,T_calc=T));
}

sensors.t.cpx_spl_mercier_1980_a.args <- function(){
    ars <- list();
    ars$minerals <- c("Cpx");
    ars$ranges <- c();
    return(ars);
}

#sensors.t.cpx_spl_mercier_1980_a.test <- function(){
#    sensors.t.cpx_spl_mercier_1980_a(Cpx=data.frame("SiO2_wtp"=c(72)), Spl=data.frame());
#}