SURVEY OF Rb$sup 85$/Rb$sup 87$ RATIOS IN MINERALS

Journal Article · Mon Apr 15 04:00:00 EST 1963 · Journal of Geophysical Research (U.S.)

DOI:https://doi.org/10.1029/JZ068i008p02331· OSTI ID:4718213

Shields, W R; Garner, E L; Hedge, C E; Goldich, S S

The Rb/sup 85//Rb/sup 87/ abundance ratio for a reference sample of rubidium sulfate was determined as 2.5995 450 deg C in a 0.0015 (95 per cent confidence interval) on a mass spectrometer with a 12-inch radius of curvature and a triple-filament mode of ionization. The abundance ratio was measured for 27 natural silicate samples that represent a wide geographic distribution. Isotopic ages for these samples range from 20 m.y. to 2600 m.y., and a variety of minerals and geologic origins are represented. No variations in the atomic abundance ratio of Rb/sup 85//Rb/sup 87/ larger than that accounted for by experimental error were observed. The absolute ratio remains to be determined. (auth)

• Research Organization: National Bureau of Standards, Washington, D.C.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-020211
• OSTI ID: 4718213
• Journal Information: Journal of Geophysical Research (U.S.), Journal Name: Journal of Geophysical Research (U.S.) Vol. Vol: 68; ISSN JGREA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGE ESTIMATION
DISTRIBUTION
ERRORS
GEOLOGY, MINERALOGY, AND METEOROLOGY
MASS SPECTROMETERS
MEASURED VALUES
MINERALS
QUANTITATIVE ANALYSIS
RUBIDIUM 85
RUBIDIUM 87
RUBIDIUM SULFATES
SILICATES
STANDARDS