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

Rock and Mineral Analysis > 2021 > 40(3): 451-459. > DOI: 10.15898/j.cnki.11-2131/td.202012040158

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

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

Beijing Research Institute of Uranium Geology, Beijing 100029, China

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Received Date: December 03, 2020
Revised Date: April 26, 2021
Accepted Date: May 16, 2021
Published Date: May 27, 2021

Abstract

HIGHLIGHTS
(1) The⁴⁰Ar content in K-Ar dilution method can be accurately measured using determined parameters by conditioned experiments.

(2) The optimal heating release and adsorption time for activated carbon cold finger were 500s and 200s, respectively.

(3) The corresponding melting temperature ofthe double vacuum furnace should be set for different types of samples.

ABSTRACT

BACKGROUNDThe 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.
OBJECTIVESTo determine the parameters by conditional experiments and establish a complete measurement method of ⁴⁰Ar content in K-Ar dilution method.
METHODSParameters 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.
RESULTSThe 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.
CONCLUSIONSThe 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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