The Isotopic Composition of Lead in Galenas in the Uranium Ores at Elliot Lake, Ontario, Canada

Meddaugh, W. Scott; Holland, Heinrich; Shimizu, N.

doi:10.1007/978-3-642-68344-2_4

Cited by 3 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the instrumental mass fractionation (IMF) of the Pb isotopes in the uraninite was not corrected as the IMF was negligibly small (Evins et al, ; Fayek, Kyser, & Riciputi, ; Holliger & Cathelineau, ; Meddaugh, ). The small IMF of Pb isotope was also estimated by that of U in uraninite (4.4 ‰/amu; Horie et al, ).…”

Section: Analytical Proceduresmentioning

confidence: 99%

“…Over the past three decades, the isotopic analysis of uraninite by secondary ion mass spectrometry (SIMS) has provided precise chronological information on the migration of uranium in association with geological events (Cathelineau, Boiron, Holliger, & Poty, ; Evins, Sunde, Schöberg, & Fayek, ; Fayek, Harrison, Ewing, Grove, & Coath, ; Fayek, Harrison, Grove, & Coath, ; Fayek, Kyser, & Riciputi, ; Fourel, Lancelot, Allegre, & Dupre, ; Holliger, , , ; Holliger & Cathelineau, , , ; Horie & Hidaka, ; Horie, Hidaka, & Gauthier‐Lafaye, ; Meddaugh, ). The calculation of the 206 Pb/ 238 U age by SIMS analysis is generally complicated by the fact that the ionization efficiency of secondary ions varies mainly with the chemistry and the structure of the target minerals.…”

Section: Introductionmentioning

confidence: 99%

“…In order to eliminate ambiguities due to the calibration and matrix effects in SIMS analysis, Meddaugh () has suggested another technique, which has been refined by Fayek et al (), that combines the SIMS analysis of the Pb isotopic composition and the EPMA analysis of Pb/U elemental ratio, and provides the U–Pb concentrations without the calibration of the secondary ion yields for U + and Pb + . The Pb concentration can be analyzed using EPMA with a stable Pb reference material, such as natural crocoite (PbCrO 4 ) or even pure Pb metal.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of U–Pb dating of uraninite using a secondary ion mass spectrometer: Selection of reference material and establishment of calibration method

Horie

Hidaka

2019

Island Arc

View full text Add to dashboard Cite

A method for U-Pb isotopic dating using secondary ion mass spectrometer (SIMS) was developed for uraninite. Correlation between 251 (UO) + / 235 U + and 206 Pb + / 235 U + obtained by a sensitive high-resolution ion microprobe (SHRIMP) was adopted for a calibration from secondary ion ratios (Pb + /U + ) to the atomic abundance ratios (Pb/U).In this study, a uraninite sample ( 206 Pb/ 238 U = 0.1647) collected from Faraday mine, Bancroft, Canada, is used as a reference material for the U-Pb calibration. The established method was applied to three uraninite samples collected from the Chardon, Ecarpière, and Mistamisk mines. The calibrated 206 Pb * / 238 U ratios of the three uraninites show correlation with Pb/U elemental ratios obtained using an electron probe microanalyzer (EPMA) (correlation coefficients: 0.98, 0.99, and 0.97, respectively), which indicates the reliability of the SHRIMP calibration method used in this study. The analysis of Ecarpière uraninite provides concordant U-Pb data, and a weighted average of the 206 Pb * / 238 U age is 287 Ma ±8 Ma (95 % conf.) which is consistent with the previous chronological results by SIMS. Mistamisk uraninite provides discordant U-Pb data with the upper and lower intercept ages of 1 729 and 421 Ma, which correspond to uraninite formation in association with the Hudsonian orogeny and the remobilization of uranium as pitchblende, respectively. The U-Pb age of Chardon uraninite (315 Ma) is consistent with the igneous activity of Mortagne granite, but is older than the previously reported age (264 Ma). Marcasite in the Chardon uraninite altered to goethite under the oxidizing condition, which indicates that U-Pb system in the uraninite crystallized at 315 Ma was disturbed under the oxidizing condition. The established calibration method using Faraday uraninite is useful for U-Pb isotopic dating on the scale of a few micrometers to tens of micrometers, which make it possible to obtain the accurate age of uraninite. K E Y W O R D S reference material, secondary ion mass spectrometry, U-Pb dating, uraninite

show abstract

Section: Analytical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of U–Pb dating of uraninite using a secondary ion mass spectrometer: Selection of reference material and establishment of calibration method

Horie

Hidaka

2019

Island Arc

View full text Add to dashboard Cite

show abstract

Applications of the Ion Microprobe to Geochemistry and Cosmochemistry

Shimizu¹,

Hart

1982

Annu. Rev. Earth Planet. Sci.

267

130

View full text Add to dashboard Cite

Ion microprobe analysis—a review of geological applications

Reed

1989

Mineral. mag.

View full text Add to dashboard Cite

In ion microprobe analysis the specimen is bombarded with a focussed ion beam a few #m in diameter and the secondary ions produced are accelerated into the entrance slit of a mass spectrometer. An outline of the salient features of the instrument is given here, together with an account of the methods used for quantitative elemental and isotopic analysis.The major part of this paper consists of a comprehensive account of the geological applications of ion microprobe analysis. These include elemental analysis, especially for trace elements (down to subppm levels in many cases) and light elements (H F) which are beyond the scope of the electron microprobe. The other main area of geological interest is isotopic analysis, where the ion microprobe has the advantage over conventional mass spectrometry of being capable of in situ analysis of selected points on polished sections, obviating the need for laborious specimen preparation, and enabling spatially-resolved data to be obtained, with a resolution of a few #m. The ion microprobe has been especially successful in U Pb zircon dating and the study of isotope anomalies in meteorites. Other significant applications include diffusion and stable isotope studies.

show abstract

The Isotopic Composition of Lead in Galenas in the Uranium Ores at Elliot Lake, Ontario, Canada

Cited by 3 publications

References 14 publications

Development of U–Pb dating of uraninite using a secondary ion mass spectrometer: Selection of reference material and establishment of calibration method

Development of U–Pb dating of uraninite using a secondary ion mass spectrometer: Selection of reference material and establishment of calibration method

Applications of the Ion Microprobe to Geochemistry and Cosmochemistry

Ion microprobe analysis—a review of geological applications

Contact Info

Product

Resources

About