k ar dating problems and advice

Most of the dating methods being discussed in the following paragraphs apply well when determining how long ago igneous rocks cooled and hardened from magma or lava. Atoms usually mix well in a liquid such as magma. When the molten material cools and hardens, the atoms no longer freely move about. Daughter atoms from radioactive decay occurring after the rocks cooled become trapped where they originated within the rocks. Like the sand grains accumulating in the bottom of the hourglass, the age of the rocks can be determined by measuring the number of daughter atoms and the number of remaining parent atoms, then using the half-life to calculate the time it took to make those daughter atoms.

One problem with argon-argon dating has been a slight discrepancy with other methods of dating. [3] Recent work by Kuiper [4] (see also Kerr [5] ) reports that a correction of % is needed. Thus the Cretaceous–Paleogene extinction (when the dinosaurs died out) - previously dated at or million years ago - is more accurately dated to Ma. Similarly, the Permian-Triassic extinction is now dated at Ma, which is effectively coincident with the age determined by other means for Siberian Traps basalt flows.

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Both flame photometry and mass spectrometry are destructive tests, so particular care is needed to ensure that the aliquots used are truly representative of the sample. Ar–Ar dating is a similar technique which compares isotopic ratios from the same portion of the sample to avoid this problem.

Maluski, H., P. Monie, . Kienast, and A. Rahmani, 1990, 'Location of Extraneous Argon in Granulitic-facies Minerals: A Paired Microprobe-laser probe 40Ar/39Ar Analysis', Chem. Geol. (Isotop. Geosci. Sec.) , v. 80, p. 193-217. 

k ar dating problems and advicek ar dating problems and advice

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One problem with argon-argon dating has been a slight discrepancy with other methods of dating. [3] Recent work by Kuiper [4] (see also Kerr [5] ) reports that a correction of % is needed. Thus the Cretaceous–Paleogene extinction (when the dinosaurs died out) - previously dated at or million years ago - is more accurately dated to Ma. Similarly, the Permian-Triassic extinction is now dated at Ma, which is effectively coincident with the age determined by other means for Siberian Traps basalt flows.

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Both flame photometry and mass spectrometry are destructive tests, so particular care is needed to ensure that the aliquots used are truly representative of the sample. Ar–Ar dating is a similar technique which compares isotopic ratios from the same portion of the sample to avoid this problem.

uranium thorium dating problems and advice

Maluski, H., P. Monie, . Kienast, and A. Rahmani, 1990, 'Location of Extraneous Argon in Granulitic-facies Minerals: A Paired Microprobe-laser probe 40Ar/39Ar Analysis', Chem. Geol. (Isotop. Geosci. Sec.) , v. 80, p. 193-217. 

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17 K-Ar and Ar-Ar Dating - UA Geosciences

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