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In doing so, they find that basement-involved deformation of the crust around 80–90 Ma caused regional heating of the crust.From latest Cretaceous through Tertiary time, they record uplift and slow cooling of the rocks, at a rate of 5–10 K/Ma.Reheating events and diffusion of argon from the boundaries of the grain can result in lower Ar date.Sometimes, when a large amount of argon has been lost, this is not possible.(a) A constant concentration profile indicates no diffusion or later heating events. (b) Recent diffusive loss of Ar yields a staircase-type profile.

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Hypothetical profiles of argon concentrations through the grain, and associated step-heating results.This gives Knapp and Heizler (1990) multiple observation points to observe the temperature history of the MFTB rocks.Ar step-heating results from Mesquite Mountain and the Northern Granite Wash Mountains.Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals. So assuming that no air gets into a mineral grain when it first forms, it has zero argon content.

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