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The usefulness of this as a dating technique stems from the tendency of some materials to lose their fission-track records when heated, thus producing samples that contain fission-tracks produced since they last cooled down.
This page was last edited on 18 Octoberat Relative dating methods are used to determine only if one sample is older or younger than another. Protactinium begins to accumulate via the decay of U after the organism dies. The date measured reveals the last time that the object was heated past the closure temperature at which the trapped argon can escape the lattice.Also, even if the argon-argon dating method does eliminate the "contamination" problem, it does not solve the problem of original argon. Renne tested Ar-Ar dating by checking it against the 79 A. This is approximately 2,500 times as much Ar as is found in natural muscovite.Did the clock get reset to zero when the volcano erupted? Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize.That is why it does not matter how long the magma was in the volcano before it erupted.They believe that when the volcano erupts, all the Scientists are well aware of this problem and use various calibration methods to "correct" for this problem. However, while it is often easy to determine the age of the primary standard by the K/Ar method, it is difficult for different dating laboratories to agree on the final age.