Opx-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.opx_spl_mercier_1980_a <- function(Opx, usePFU=FALSE, ...){
    
    row_name = Opx$Name;
    
    if(!usePFU) {
        Opx <- tpf.recalc_minaral("OPX",Opx);
    }

    A <- (Opx$Al_c4_pfu + Opx$Al_c6_pfu - Opx$Na_pfu) / 2;
    W <- Opx$Ca_pfu / (Opx$Ca_pfu + Opx$Mg_pfu + Opx$Fe_p2_pfu + Opx$Fe_p3_pfu);
    FCR <- Opx$Cr_pfu / (Opx$Al_c4_pfu + Opx$Al_c6_pfu + Opx$Cr_pfu - Opx$Na_pfu);
    XKW <- 6 * W / (1 - 2 * W);
    XKA <- A / (1 - A) / (1 - 2.87 * FCR)^2;
    D <- log(XKA) * log(XKW) - 8.6751 * log(XKW) + 2.2595 * log(XKA) + 24.568;
    T <- (45449 - 6308.5 * log(XKW)) / D - 273.15;

    return(data.frame(Name=row_name,T_calc=T));
}

sensors.t.opx_spl_mercier_1980_a.args <- function(){
    ars <- list();
    ars$minerals <- c("Opx");
    ars$ranges <- c();
    return(ars);
}

#sensors.t.opx_spl_mercier_1980_a.test <- function(){
#
#}