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They show (in figure 3) only the diffusivity data for depths 1, 2, and 3, not for depths 4 and 5.

They report error bars for the former set but not for the latter, saying only that the parameters of eq.

relative age dating inclusions-11

Data and equations from the 1986 article show that at the present temperature (313°C) at that depth, it would take only 5,100 (+3,800/-2,100) years for the feldspar to lose that much argon. Instead, its authors thought (along with Loechelt) that the temperatures in the borehole were relatively low, e.g.

This supports the 6,000 (± 2,000) year helium diffusion age that RATE found for zircons in the same borehole. Drilling rig for borehole GT-2 at Fenton Hill, New Mexico, USA, which provided the zircons used in the RATE helium project and the feldspar whose argon is the basis for this study. at 2.9 km depth falling below 130°C 870 Ma ago and reaching 87°C more than a million years ago.

Readers can see my detailed review of all three articles in my recent letter replying to Loechelt.

So why did they want the borehole to be relatively cool (e.g. Much more argon would have diffused out of the minerals.

Here I will show that their argon diffusion data favor an age of only 5,100 (+3,800/-2,100) years.

That strongly supports the helium diffusion age RATE found for zircons in the same borehole, 6,000 (± 2,000) years. The last two parameters are constant with temperature for any given sample, but are often different for samples from different locations.Here the authors got one set of values of for depths 1, 2, and 3, and a different set of values for depths 4 and 5. The authors’ report of the argon diffusivities leaves something to be desired for my purpose of determining age. It was one of three articles I had cited about the temperature issue.Then only twenty thousand years ago, they claimed, the temperatures rose dramatically, by more than 100°C, up to the high values observed today.by the authors’ Los Alamos colleagues showed that the nearby volcano would heat the borehole up to within 50°C of today’s temperatures, maintaining that high temperature for (allegedly) the last 0.8 Ma.The temperature would have been a lot more if the magma body causing the volcano had been somewhat closer to the borehole than they assumed in that model. would be quite aware of the possibility of such heating from the volcano. I will show below that it was probably because they knew borehole minerals could not have retained the observed large percentages of argon for hundreds of millennia at anywhere near today’s high borehole temperatures.

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