Radiometric dating of crystals inside rocks
The critic wanted to increase the helium-leak age to over a billion years by having the formation be very much cooler in the past than it is at present. He depended heavily on a 1986 paper in the by geoscientists from three US universities.
They modelled past temperatures in the formation using argon data in the borehole as a constraint.
It comes from a site that RATE had previously studied, a borehole that penetrated miles deep into the granitic rock of the earth’s crust near a volcanic crater in northern New Mexico, USA. The borehole from which RATE’s zircons came, and the feldspar for this study, is just outside the caldera’s western rim.
Valle Grande, New Mexico, USA, is inside Valles Caldera, a 16-km-wide volcanic crater.
It's simple enough to explain in a short time to almost everyone. Based on accelerated decay, is it possible Cm 247 existed during the creation event?
geoscientists estimate the rock formation is 1.5 billion years old.
But creation scientists found the zircons retained surprisingly high amounts of the helium that the uranium-to-lead decay would have produced.
The other two papers I had cited contradicted the low-temperature assumption, one with much more reasonable heat models, the other with actual data.
In my reply than today, high enough for long enough to almost completely eradicate helium from the zircons.