Determination of Experimental Parameters during Measurement of <sup>40</sup>Ar Content in K-Ar Dilution Method

ZHANG Jia; LIU Han-bin; LI Jun-jie; JIN Gui-shan; HAN Juan; ZHANG Jian-feng; SHI Xiao

doi:10.15898/j.cnki.11-2131/td.202012040158

2021 Vol. 40, No. 3

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Article navigation > Rock and Mineral Analysis > 2021 > 40(3): 451-459

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ZHANG Jia, LIU Han-bin, LI Jun-jie, JIN Gui-shan, HAN Juan, ZHANG Jian-feng, SHI Xiao. Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method[J]. Rock and Mineral Analysis, 2021, 40(3): 451-459. doi: 10.15898/j.cnki.11-2131/td.202012040158

Citation:

ZHANG Jia, LIU Han-bin, LI Jun-jie, JIN Gui-shan, HAN Juan, ZHANG Jian-feng, SHI Xiao. Determination of Experimental Parameters during Measurement of ⁴⁰Ar Content in K-Ar Dilution Method[J]. Rock and Mineral Analysis, 2021, 40(3): 451-459. doi: 10.15898/j.cnki.11-2131/td.202012040158

Determination of Experimental Parameters during Measurement of ⁴⁰Ar Content in K-Ar Dilution Method

Beijing Research Institute of Uranium Geology, Beijing 100029, China

Received Date: 04 December 2020

Revised Date: 27 April 2021

Accepted Date: 17 May 2021

Publish Date: 28 May 2021

Abstract

Abstract

BACKGROUND
The measurement of ⁴⁰Ar content in K-Ar dilution method includes sample melting and releasing gas, gas purification and enrichment, mass spectrometry measurement. With the application of a newly designed double vacuum furnace and gas purification system, the experiment process gradually changes from manual operation to automatic program control, but the parameters are unclear.
OBJECTIVES
To determine the parameters by conditional experiments and establish a complete measurement method of ⁴⁰Ar content in K-Ar dilution method.
METHODS
Parameters were determined by releasing and absorbing an air standard in activated carbon cold finger with different times, melting different types of samples with different temperatures of the double vacuum furnace. The method reliability was verified by K-Ar dating for SK01 sanidine standard.
RESULTS
The optimal heating release time for activated carbon cold finger was 500s, and the adsorption time was 200s. Using these conditions, the gas produced by the melting in the furnace can be completely transferred and released to avoid isotope fractionation. The corresponding melting temperature was used for different types of samples to ensure that the samples were completely melted and outgassed, the melting temperature of the furnace for clay minerals, biotite, and muscovite should be set to 1400℃, and 1500℃ for amphibole, 1550℃ for basic rock, and 1600℃for potassium feldspar. The K-Ar dating of 10 sets of SK01 sanidine standards showed that the results were consistent with ⁴⁰Ar-³⁹Ar dating ages.
CONCLUSIONS
The obtained condition parameters meet the accurate measurement of ⁴⁰Ar content using the K-Ar dilution method.
- K-Ar dilution dating /
- ⁴⁰Ar content /
- heating release time /
- absorption time /
- melting temperature

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References

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