Ar-Ar Dating

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Argon-argon dating - Wikipedia
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Argon-argon (or 40 Ar / 39 Ar ) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy . 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 .
www .geo .arizona .edu › ~reiners › geos474-574 › Kelley2002 .pdf
Although Thorbjorn Sigurgeirsson proposed the principles of Ar-Ar dating in an unpublished Icelandic laboratory report in 1962, he never succeeded in publishing or testing the idea . The Ar-Ar dating technique as it is practised today originated in the noble gas laboratory of John Reynolds in Berkeley, where Craig Merrihue and Grenville
www .mantleplumes .org › ArAr .html
The proliferation of 40 Ar / 39 Ar dating laboratories has led to a large number of papers reporting age data . However, in many instances, the published "ages" have no merit, as they fail the simple statistical tests that should be applied to all such data .
Because 39 Ar has a very short half-life, it is guaranteed to be absent in the sample beforehand, so it's a clear indicator of the potassium content . The advantage is that all the information needed for dating the sample comes from the same argon measurement . Accuracy is greater and errors are lower . This method is commonly called "argon-argon dating ."
hyperphysics .phy-astr .gsu .edu › hbase › Nuclear › KAr .html
The conventional potassium-argon dating process is technically difficult and usually is carried out by analyzing for potassium in one part of the sample and measuring 40 Ar in another . The Ar-Ar process can be done on the same small piece of a sample, analyzing for both gases in a mass spectrometer .
According to the assumptions foundational to potassium-argon (K-Ar) and argon-argon ( Ar-Ar ) dating of rocks, there should not be any daughter radiogenic argon ( 40 Ar *) in rocks when they form . When measured, all 40 Ar * in a rock is assumed to have been produced by in situ radioactive decay of 40 K within the rock since it formed .
Ar *, and the physical contamination of a magma by inclusion of older xenolitic material . The Ar-Ar dating method was developed to measure the presence of extraneous argon . Great care is needed to avoid contamination of samples by absorption of nonradiogenic 40 Ar from the atmosphere . The equation may be corrected by subtracting from the 40 Ar
www-odp .tamu .edu › publications › 161_SR › VOLUME › CHAPTERS › CHAP_22 .PDF
Ar-Ar dating of muscovite and biotite from high-grade schist and pelitic gneiss cored at O cean Drilling Program Site 976 in the Alboran Sea yield cooling ages in the range 18 .5 to 20 Ma . The difference in mean age of the two minerals is only 0 .8 ± 0 .5
The 40 Ar / 39 Ar dating technique is a more sophisticated variation of the K/Ar dating technique . Both techniques rely on the measurement of a daughter isotope ( 40 Ar ) and a parent isotope . While the K/Ar technique measures potassium as the parent, the 40 Ar / 39 Ar technique uses 39 Ar .
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-40 (K-40) ,decays to the gas Argon as Argon-40 ( Ar -40) .
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Ar-Ar Dating