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Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Geologists have used this method to date rocks as much as 4 billion years old. It is based on the fact that some of the radioactive isotope of Potassium, Potassium K ,decays to the gas Argon as Argon Ar By comparing the proportion of K to Ar in a sample of volcanic rock, and knowing the decay rate of K, the date that the rock formed can be determined. How Does the Reaction Work?
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Potassium-Argon Dating Methods

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This supports the Broad Pass Fault being active during the Quaternary. In summary, the Alaska Range was being unroofed by the early Miocene, the Nenana River drainage changed direction by this time period to northward flowing, and drainage reorganization continues today. Session No. The Alaska Range has an unusual physiography with two rivers the Nenana and the Delta sourced from the south side of the divide which traverse along the range front some distance before heading north, cutting through the mountain range. In addition we dated select bedrock samples for additional source constraints and compared our results to regional geochronology data sets and geological mapping. Geological Society of America Abstracts with Programs. Permission is hereby granted to the author s of this abstract to reproduce and distribute it freely, for noncommercial purposes.
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The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. The sample is generally crushed and single crystals of a mineral or fragments of rock are hand-selected for analysis. These are then irradiated to produce 39 Ar from 39 K via the n-p reaction 39 K n,p 39 Ar. The sample is then degassed in a high-vacuum mass spectrometer via a laser or resistance furnace.
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How Accurate is K-Ar Dating? Email: laurence unmaskingevolution. Webpage: www. Messel, "A Modern Introduction to Physics" vol.
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