Willow is sucked in by his unreliable and dishonest hero Milton:
willow writes:
"Argon 40 is a very common isoptope. Argon is the 12th most abundant chemical element on Earth and more than 99 percent is argon 40.
There is no physical or chemical way to tell whether any given sample of argon 40 is the residue of radioactive decay or was present in the rocks when they formed. Moreover, as argon is an inert gas that will not react with any other element, its atoms will always be trapped in the crystal structures of minerals whether it is radiogenic in origin or not.
So, if radiogenic argon 40 is like "a bird in a cage", then it is a cage that already contains birds of the same feather, from which it is indistinguishable." END MILTON QUOTE.
The above evidence went completely unchallenged.
The gist of this fallacy was debunked by Mark Austin in message #158. You failed to respond to that message.
Let me reiterate the point in simple terms for you. I will type slowly to make it easier for you.
When lava is expelled from a volcano, any chemically inert Argon gas atoms already in the lava are boiled off from the lava. Therefore, when the lava cools and forms crystal minerals, there are no Argon atoms in the crystals. This postulated process has been tested many times and found to be generally accurate. Thus the only Ar which can be detected in such igneous rocks is the result of the radioactive decay of Potassium in the lava's crystaline material into Argon. If you can answer jar's repeated question then you are some way towards understanding how the measured ratios of potassium and argon in a lava sample and the known halflife can allow you to calculate the age of the lava sample.
So, Milton's birdcage
is empty.
Funkhouser and Naughton's studies showed that other older material which may become trapped in the lava flow (inclusions or xenoliths) may undergo partial release of any radiogenic argon in the inclusions but not complete degassing. Therefore the radiometic clock of those inclusions will not be reset to zero years at the time of the lava flow. However, this is the part which Milton dishonestly neglects to mention, Funkhouser and Naughton's radiometric dating of the lava material surrounding the inclusions gave the correct date (compared with the independent historical records). Dalrymple cited 25 other radiometric datings of historical lava flows which gave the correct or near correct datings. Does Milton offer anything besides the misrepresentation of Funkhouser and Naughton's paper?