Rubidium-Strontium Isotopic Age Studies, Report 2 (Canadian Shield).
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Rubidium-Strontium Isotopic Age Studies, Report 2 (Canadian Shield). by Geological Survey of Canada.

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Published by s.n in S.l .
Written in English


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Edition Notes

1

SeriesPaper (Geological Survey of Canada) -- 77-14
ContributionsWanless, R.K., Loveridge, W.D.
ID Numbers
Open LibraryOL21905038M

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Dating - Dating - Rubidium–strontium method: The radioactive decay of rubidium (87Rb) to strontium (87Sr) was the first widely used dating system that utilized the isochron method. Rubidium is a relatively abundant trace element in Earth’s crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium. Initial Nd isotopic ratios of crystalline rocks from an area of about {times} 10{sup 6} km{sup 2} of the western United States have been determined in order to map Precambrian age province boundaries and thus document the growth and modification of the North American continent in the Proterozoic. Three age provinces have been delineated. The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr).. Development of this process was aided by German chemists Otto Hahn and Fritz Strassmann, who later went on to discover nuclear fission in December Rubidium-strontium dating, method of estimating the age of rocks, minerals, and meteorites from measurements of the amount of the stable isotope strontium formed by the decay of the unstable isotope rubidium that was present in the rock at the time of its formation. Rubidium comprises percent of the total atomic abundance of rubidium, and of the four isotopes of strontium, only.

In terms of the quantity of Sr processed for isotopic composition analyses, Rubidium, strontium and the isotopic composition of strontium Table 1. Chemical processing blanks, expressed as /Cited by: The isotopic composition of lead from potassium feldspars of granite and pegmatites and from galena of near-by sulfide ores near Balmat, New York, was measured. Mineral ages have been measured by the Rb-Sr and K-Ar methods on potassium feldspars and associated micas. The best Rb-Sr age is m.y., and the K-Ar age is in good agreement at The alkaline earth metal strontium (38 Sr) has four stable, naturally occurring isotopes: 84 Sr (%), 86 Sr (%), 87 Sr (%) and 88 Sr (%). Its standard atomic weight is (1).. Only 87 Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87 Rb, which has a half-life of × 10 10 years (i.e. more than three times longer than the current age of the Standard atomic weight A(Sr): (1).   2. The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87Rb) and strontium (87Sr, 86Sr). 3.

Rubidium/Strontium Dating of Meteorites. The study of the rubidium/strontium isotopic ratios in a set of meteorite samples shows the general approach to this kind of radioactive isotope 87 Rb decays into the ground state of 87 Sr with a half-life of x 10 10 years and a maximum b-energy of keV. 86 Sr is of non-radiogenic origin and can be used as a reference concentration to. Periodic Table--Strontium. The alkali earth metal strontium has four stable, naturally occurring isotopes: 84 Sr (%), 86 Sr (%), 81 Sr (%) and 88 Sr (%). Only 87 Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87 Rb, which has a half-life of 48,, years. Thus, there are two sources of 87 Sr in any material: that formed during primordial nucleo. [Show full abstract] prospect (Z inferred resource of million metric tons (Mt) at g/t Au and wt % Cu). The La-Grande-Sud Au-Cu prospect is hosted in the ± 2 Ma synvolcanic. In Rubidium-strontium and uranium-lead isotopic age studies, report 4. Edited by W. D. Loveridge. In Current research, part C. Geological Survey of Canada, Paper lC, pp. Author: Ronald Doig.