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Vardiman, L. The 'age' of each concentrate is calculated by making use of what Faure 19 calls the 'general model-age equation':. As mentioned above, we already know that Austin's application of the K-Ar method to this dacite sample was flawed from the beginning. Laughlin and J. The 'heavy-magnetic concentrate' also had glassy particles more abundant than in the 'heavy-nonmagnetic concentrate'. In some cases, the magma may not be hot enough to melt or entirely dissolve the xenocrysts and they may survive after the melt cools. Even if the dacite glass does contain excess argon, Dalrymple , p.

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