Table 3.

The ‘MacArgon’ program (adapted for use with the MacOSX operating systems) is used to compute closure temperatures that would apply for cooling through the Argon Partial Retention Zone, for a range of cooling rates, for zero pressure, as well as for the case when a pressure of 10 kbar (100 MPa) was applied. A single sample was analysed (AG03-07) with a value close to the UCLA average obtained if the first two Arrhenius points were discounted, and the ANU average if these points are taken into account, and no violations of the FAP allowed. Only data for the most retentive domains are shown

Closure temperatures using:	Fitted using statistical method	Fitted using FAP
‘MacArgon’ for MacOSX
Activation energy	46.9 kcal mol⁻¹	73.5 kcal mol⁻¹
Activation volume	10 cm³	10 cm³
Most retentive domains D₀/r²	33.5 s⁻¹	5.65×10⁵ s⁻¹
100 °C Ma⁻¹, 0 kbar	399 °C	553 °C
10 °C Ma⁻¹, 0 kbar	360 °C	514 °C
1 °C Ma⁻¹, 0 kbar	325 °C	479 °C
100 °C Ma⁻¹, 10 kbar	432 °C	579 °C
10 °C Ma⁻¹, 10 kbar	391 °C	539 °C
1 °C Ma⁻¹, 10 kbar	354 °C	503 °C
D₀/r² for fitted line	2.32×10⁵ s⁻¹	1.34×10¹² s⁻¹
100 °C Ma⁻¹, 0 kbar	269 °C	354 °C
10 °C Ma⁻¹, 0 kbar	243 °C	332 °C
1 °C Ma⁻¹, 0 kbar	219 °C	310 °C
100 °C Ma⁻¹, 10 kbar	296 °C	375 °C
10 °C Ma⁻¹, 10 kbar	269 °C	351 °C
1 °C Ma⁻¹, 10 kbar	244 °C	329 °C