Table 1 List of independent variables in the argon degassing model.

ParameterDefinitionValueUnit
tdTiming of
sudden
degassing
0.05 to 0.1Ga
FdSudden
degassing
fraction
10 to 80%
36Ar(t0)Initial amount
of 36Ar in BSE
2 × 1039 to 2 × 1040No. of atoms
κrDecay constant
of crustal
recycling rate
−3 to 3Ga−1
κgDecay constant
of crustal
generation rate
−1 to 30Ga−1
RsInitial crustal
recycling rate
0 to 10 × 1022kg Ga−1
RpPresent-day
crustal
recycling rate
0 to 2 × 1022kg Ga−1
tsCrustal growth
starting point
0.057 to 0.567Ga
frwCrustal
reworking rate
factor
0.1 to 0.8
HBSE(tp)Present-day
BSE heat
production
13 to 19TW
HCC(tp)Present-day
continental
crust heat
production
5 to 10TW
Qtotal(tp)Present-day
total terrestrial
heat flux
43 to 49TW
Qc(tp)Present-day
core heat flux
5 to 15TW
ΔQcDifference
between initial
and present-
day Qc
2 to 5TW
feffKmoIncomplete
degassing
factor for
mid-ocean
ridge degassing
50 to 100%
feffKmpIncomplete
degassing
factor for
mantle plume
degassing
10 to 100%