Bt: Henry, Guidotti, Thomson, for metapelites, 2005

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The relationship between Ti-content, temperature, and Mg/(Mg + Fe) value was calibrated empirically using an extensive natural biotite data set (529 samples) from western Maine and south-central Massachusetts in combination with the petrogenetic grid of Spear et al. (1999).

Details

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Article	Darrell J. Henry, Charles V. Guidotti, Jennifer A. Thomson The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms American Mineralogist, Volume 90, pages 316–328, 2005
Reference	henry2005.pdf
Collibration	529 samples form western Maine and south-central Massachusetts in combination with the petrogenetic grid of Spear et al. , XMg = 0.275–1.000, Ti = 0.04–0.60 apfu, and T = 480–800 °C.
Presition	± 24 °C
Ranges	4 < P < 6 kbar, 480 °C < T < 800 °C
Renew sensors

Source

source('recalc_bt_tindle.r');
 
sensors.t.bt_henry_guidotti_thomson <- function(Bt, usePFU = FALSE, ...){
 
if (!usePFU) Bt <- recalc.bt_tindle(Bt);

Bt$X_Mg = Bt$Mg_pfu / (Bt$Mg_pfu + Bt$Fe_pfu);

A = -2.3594;
B = 4.6482e-9;
C = - 1.7283;

Tcalc = ((log(Bt$Ti_pfu) - A - C*(Bt$X_Mg^3))/B)^0.333333;
 
return (data.frame(Name=Bt$Name, T_calc_Bt_Henry_Guidotti_Thomson=Tcalc));
}
 
sensors.t.bt_henry_guidotti_thomson.args <- function() {
    ars <- list();
    ars$minerals = c('Bt');
    ars$ranges = c();
    return(ars);
}