GSA Bulletin ; 96 3: Some units are fossiliferous and contain corals as isolated fragments in sediments of a detrital character. These corals are subject to alteration processes such that suites of related samples must be examined to determine the suitability of these coral samples for reliable uranium-series dating. With the exception of those from one location, most samples appear to have remained closed systems with respect to the isotopes of uranium and thorium throughout their geologic history.
Extraneous Th has been detected in some of the corals due to incorporation of some detrital materials into their skeletons. For these samples, different methods are applied to correct for the initial Th contamination. Continued sampling and analyses have resulted in 55 individual uranium-thorium determinations.
There is general agreement between uranium-series and uranium-trend dates and between the quantitative trends of the amino acid data and uranium-series dates. The amino acid values, however, ure unacceptably high in at least two groups of samples, those from localities near Charleston, South Carolina, and from central Virginia.
Uranium–thorium dating
Sign In or Create an Account. Close mobile search navigation Article navigation. As time passes after such material has formed, uranium in the sample with a half-life of , years decays to thorium At secular equilibrium, the number of thorium decays per year within a sample is equal to the number of thorium produced, which also equals the number of uranium decays per year in the same sample.
- Uranium–thorium dating!
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In , John Joly , a professor of geology from the University of Dublin , found higher Radium contents in deep sediments than in those of the continental shelf, and suspected that detrital sediments scavenged Radium out of sea water. Piggot and Urry found in , that Radium excess corresponded with an excess of Thorium.
Uranium-Series Dating of Corals and Oolites from Bahaman and Florida Key Limestones.
It took another 20 years until the technique was applied to terrestrial carbonates speleothems and travertines. In the late 80's the method was refined by mass spectrometry. After Viktor Viktorovich Cherdyntsev 's landmark book about uranium had been translated into English, U-Th dating came to widespread research attention in Western geology.
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U-series dating is a family of methods which can be applied to different materials over different time ranges. Each method is named after the isotopes measured to obtain the date, mostly a daughter and its parent.
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Eight methods are listed in the table below. Using this technique to calculate an age, the ratio of uranium to its parent isotope uranium must also be measured. U-Th dating yields most accurate results if applied to precipitated calcium carbonate, that is in stalagmites , travertines, and lacustrine limestones. Bone and shell are less reliable.
Mass spectrometry also uses smaller samples. From Wikipedia, the free encyclopedia. Department of Geosciences, University of Arizona.