Table 2 List of dependent variables in the argon degassing model.

ParameterDefinitionCalculation
Q(tp)Present-day mantle
heat flux
Q(tp) = Qtotal(tp) − HCC(tp)
40KBSE(tp)Present-day 40K in the
BSE
Calculate according to HBSE(tp)
40Kcc(tp)Present-day 40K in the
continental crust
Calculate according to HCC(tp)
QcCore heat fluxQc(t) = ΔQc(tpt)/tp + Qc(tp)
KmpHot spot island
generation rate
Kmp(t)=Kmp(tp)Qc(t)Qc(tp)feffKmp
KmoOceanic crust
generation rate
Kmo(t)=Kmo(tp)Z(t)V(t)Z(tp)V(tp)feffKmo