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Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology
R.H. Steiger,E. Jäger +1 more
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The IUGS Subcommission on Geochronology (FOOTNOTE 4) as discussed by the authors recommended the adoption of a standard set of decay constants and isotopic abundances in isotope geology.About:
This article is published in Earth and Planetary Science Letters.The article was published on 1977-10-01. It has received 9474 citations till now.read more
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Abundances of the elements: Meteoritic and solar
Edward Anders,Nicolas Grevesse +1 more
TL;DR: In this article, new abundance tables have been compiled for C1 chondrites and the solar photosphere and corona, based on a critical review of the literature to mid-1988.
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The decay constant of 176Lu determined from Lu-Hf and U-Pb isotope systematics of terrestrial Precambrian high-temperature mafic intrusions
TL;DR: In this paper, a cross-calibration of U-Pb and Lu-Hf isotopic systems on mineral fractions from the Proterozoic Karlshamn and Sorkka dolerites in Sweden and Finland is presented.
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Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating
Paul R. Renne,Paul R. Renne,Carl C. Swisher,Alan L. Deino,Daniel B. Karner,Thomas L. Owens,Donald J. DePaolo +6 more
TL;DR: McDougall et al. as mentioned in this paper derived intercalibration factors for McClure Mountain hornblende (MMhb-1), GHC-305 biotite, GA-1550, Taylor Creek sanidine (TCs), relative to Fish Canyon sanidine(ACs), were derived from 797 analyses involving 11 separate irradiations with well-constrained neutronfluence variations.
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An alternative astronomical calibration of the lower Pleistocene timescale based on ODP Site 677
TL;DR: In this paper, a modified version of the timescale proposed by Imbrieet et al. for the ODP Site 677 has been proposed, based on the precession signal in the record from ODP site 677 that provides the basis for the revised timescale.
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The zeta age calibration of fission-track dating
TL;DR: In this article, an alternative zeta (ζ) calibration approach is described, which circumvents absolute φ and λf evaluation: each dosimeter glass is calibrated repeatedly against zircon age standards from the Fish Canyon and Bishop tuffs, the Tardree rhyolite and Southern African kimberlites, to obtain empirical calibration factors ζ.
References
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Precision Measurement of Half-Lives and Specific Activities of U 235 and U 238
TL;DR: New determinations of the half-lives of half-life values of $ −235 and −238 have been made improved techniques have allowed the halflife values to be measured with greater accuracy than has been heretofore achieved as discussed by the authors.
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A Redetermination of the Relative Abundances of the Isotopes of Carbon, Nitrogen, Oxygen, Argon, and Potassium
Journal ArticleDOI
Absolute Isotopic Abundance Ratios and the Atomic Weight of a Reference Sample of Chromium.
TL;DR: An absolute value for the isotonic abundance ratio of a reference sample of copper has been obtained by thermal emission mass spectrometry and it has been shown that there is significant variation in some rare secondary minerals.
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The Isotopic Constitution of Strontium, Barium, Bismuth, Thallium and Mercury
TL;DR: A mass-spectrographic study of the isotopic constitution of Sr, Ba, Bi, and Tl has been made as mentioned in this paper, and it was shown that if a new isotope exists it must have an abundance less than one-tenth of that at one time assigned to it by Aston.
Journal ArticleDOI
The variability of the natural abundance of 235U
G. A. Cowan,Hans H Adler +1 more
TL;DR: The possibility that the atomic ratio 235u/238U may be slightly variable due to natural nuclear chain reactions such as have been identified in Gabon, West Africa, has prompted a re-examination of very precise gas mass spectrometric isotopic ratio data from a number of laboratories.
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