scholarly journals Lead isotope analyses of standard rock samples.

1990 ◽  
Vol 38 (5) ◽  
pp. 241-252 ◽  
Author(s):  
Yoshiyuki Koide ◽  
Eizo Nakamura
Keyword(s):  
Lead Isotope ◽  
Standard Rock ◽  
Rock Samples ◽  
Isotope Analyses

Lead Isotope Studies of Rock Samples from the Superior Geological Province

1971 ◽  
Vol 8 (4) ◽  
pp. 444-454 ◽  
Author(s):  
J. M. Ozard ◽  
R. D. Russell
Keyword(s):  
Standard Deviation ◽  
Lead Isotope ◽  
Lead Isotopes ◽  
Internal Standard ◽  
Lake Area ◽  
Single Filament ◽  
Lead Isotope Ratios ◽  
Rock Samples ◽  
Isotope Studies ◽  
Isotope Analyses

Single filament whole rock lead isotope analyses were corrected for fractionation by using an internal standard (double spike). An estimated standard deviation of 0.15% was obtained for lead isotope ratios and 0.25% for lead and uranium concentrations. These are some of the first analyses of this accuracy for lead isotopes in whole rocks. Lead and uranium analyses from the Vogt–Hobbs area near Lake Timagami, Ontario and from the Rice Lake – Beresford Lake area, Manitoba gave ages with the pattern lead–lead age > uranium 235 – lead 207 age > uranium 238 – lead 206 age. This pattern was interpreted as arising from loss of lead from the systems studied. A similar three-stage history, marked by major events prior to 3000 m.y. ago and at approximately 2600 m.y. ago, fits both of these suites. This history is shown to be consistent with rubidium–strontium data, zircon uranium–lead ages, potassium–argon, and ore lead data.

Precise magnesium isotope analyses of high-K and low-Mg rocks by MC-ICP-MS

2019 ◽  
Vol 34 (5) ◽  
pp. 940-953 ◽  
Author(s):  
Zhian Bao ◽  
Kangjun Huang ◽  
Tianzheng Huang ◽  
Bing Shen ◽  
Chunlei Zong ◽  
...  
Keyword(s):  
Igneous Rock ◽  
Magnesium Isotope ◽  
Rock Samples ◽  
High K ◽  
Icp Ms ◽  
Isotope Analyses

This study presents a chemical protocol for the separation of Mg that is particularly adapted for diverse igneous rock samples, especially for high-K and low-Mg rocks.

Identification of source mine using sulfur, mercury, and lead isotope analyses of vermilion used in three representative tombs from Kofun period in Japan

2021 ◽  
Vol 37 ◽  
pp. 102970
Author(s):  
Takeshi Minami ◽  
Akinori Takeuchi ◽  
Setsuo Imazu ◽  
Masayoshi Okuyama ◽  
Yu Higashikage ◽  
...  
Keyword(s):  
Lead Isotope ◽  
Isotope Analyses

Lead isotope analyses from Tell Abraq, United Arab Emirates: new data regarding the ‘tin problem’ in Western Asia

Antiquity ◽  
1999 ◽  
Vol 73 (279) ◽  
pp. 49-64 ◽  
Author(s):  
Lloyd Weeks
Keyword(s):  
United Arab Emirates ◽  
Lead Isotope ◽  
Isotope Data ◽  
Western Asia ◽  
Tell Abraq ◽  
New Research ◽  
Isotope Analyses

The ‘tin problem’ forms the focus for discussion on the earliest use of tin and bronze in western Asia and the Aegean. New research on lead isotope data from Tell Abraq in the UAE has important implications for the advent of bronze in the region.

scholarly journals Development of a fully automated open-column chemical-separation system—COLUMNSPIDER—and its application to Sr-Nd-Pb isotope analyses of igneous rock samples

2012 ◽  
Vol 107 (2) ◽  
pp. 74-86 ◽  
Author(s):  
Takashi MIYAZAKI ◽  
Bogdan Stefanov VAGLAROV ◽  
Masakazu TAKEI ◽  
Masahiro SUZUKI ◽  
Hiroaki SUZUKI ◽  
...  
Keyword(s):  
Igneous Rock ◽  
Chemical Separation ◽  
Separation System ◽  
Pb Isotope ◽  
Rock Samples ◽  
Isotope Analyses

Lead-isotope study of mineralization in the Cobalt district, Ontario

1986 ◽  
Vol 23 (10) ◽  
pp. 1568-1575 ◽  
Author(s):  
R. I. Thorpe ◽  
M. D. Goodz ◽  
I. R. Jonasson ◽  
J. Blenkinsop
Keyword(s):  
Lead Isotope ◽  
Sedimentary Rocks ◽  
Time Range ◽  
Two Stage ◽  
Metal Source ◽  
Genetic Link ◽  
Isotope Data ◽  
Isotope Study ◽  
Homogeneous Composition ◽  
Isotope Analyses

Twenty-seven lead-isotope analyses for galena specimens from 14 localities in the Cobalt district represent sulphide-rich interflow sedimentary units in the Archean volcanic sequence, mineralized zones, fracture fillings, and local sulphide concentrations in the Cobalt Group (Proterozoic) sedimentary rocks, and vein-filling and breccia-cementing sulphides from within and near silver–arsenide veins. The analyses define a very homogeneous composition, averaging 206Pb/204Pb = 14.732, 2O7Pb/204Pb = 15.114, and 208Pb/204Pb = 34.301, for lead from these different geological settings. This result is in agreement with textural observations indicating a late paragenetic position for galena in the different settings mentioned. The model age for this lead is in general accord with the U–Pb age obtained in a study by Andrews et al. for a Nipissing diabase sheet at Gowganda.About one third of the galena specimens are interpreted by a two-stage evolution model to have formed or been remobilized during an event in the time range 1650–1945 Ma. The timing and character of this event are not clearly defined. The radiogenic composition of a specimen from the Pan Silver property is comparable to radiogenic values reported by Thorpe and suggests a young galena-forming event in the area.The lead-isotope data are permissive evidence for a genetic link between the Nipissing diabase sheets and mineralization of a variety of types in the Cobalt district. The metal source is not clearly indicated, but one analysis for Archean interflow sulphides suggests than an Archean source is unlikely for the lead in the silver–arsenide veins and other mineralized zones.

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