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1955•Transactions American Geophysical UnionRequires access

Radiogenic SR87 in micas from granites

L. T. Aldrich, L. F. Herzog, W. H. Pinson, G. L. Davis

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Abstract

Additional samples of mica have been analyzed for radiogenic Sr87 by the method of isotope dilution. The proportion of radiogenic Sr87 in the Sr87 in each of these micas is much greater than that found previously. Three biotite samples have been reanalyzed using improved procedures, and in every case, greater proportions of radiogenic Sr87 were also found. As a result, biotite appears to be much more favorable as a mineral to be used for Rb‐Sr age measurements. Since the source and isotopic composition of the Sr contamination in the earlier group of samples are not known, the Sr86/Sr88 isotope variations reported by us at that time are of questionable value.

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What this paper is about

Additional samples of mica have been analyzed for radiogenic Sr87 by the method of isotope dilution. The proportion of radiogenic Sr87 in the Sr87 in each of these micas is much greater than that found previously. Three biotite samples have been reanalyzed using improved procedures, and in every case, greater proportions of radiogenic Sr87 were also found. As a result, biotite appears to be much more favorable as a mineral to be used for Rb‐Sr age measurements. Since the source and isotopic composition of the Sr contamination in the earlier group of samples are not known, the Sr86/Sr88 isotope variations reported by us at that time are of questionable value.

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Available abstract

Additional samples of mica have been analyzed for radiogenic Sr87 by the method of isotope dilution. The proportion of radiogenic Sr87 in the Sr87 in each of these micas is much greater than that found previously. Three biotite samples have been reanalyzed using improved procedures, and in every case, greater proportions of radiogenic Sr87 were also found. As a result, biotite appears to be much more favorable as a mineral to be used for Rb‐Sr age measurements. Since the source and isotopic composition of the Sr contamination in the earlier group of samples are not known, the Sr86/Sr88 isotope variations reported by us at that time are of questionable value.

Key concepts: Radiogenic nuclide, Biotite, Mica, Geology, Geochemistry, Mineral, Isotope dilution, Isotope

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