Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method
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 c...
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| Format: | Article |
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Science Press, PR China
2021-05-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012040158 |
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| author | ZHANG Jia LIU Han-bin LI Jun-jie JIN Gui-shan HAN Juan ZHANG Jian-feng SHI Xiao |
| author_facet | ZHANG Jia LIU Han-bin LI Jun-jie JIN Gui-shan HAN Juan ZHANG Jian-feng SHI Xiao |
| author_sort | ZHANG Jia |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T23:08:49Z |
| format | Article |
| id | doaj.art-51af87915497444cbcfec1cf1c3a9853 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:08:49Z |
| publishDate | 2021-05-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-51af87915497444cbcfec1cf1c3a98532023-01-13T07:06:42ZengScience Press, PR ChinaYankuang ceshi0254-53572021-05-0140345145910.15898/j.cnki.11-2131/td.202012040158yk202012040158Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution MethodZHANG Jia0LIU Han-bin1LI Jun-jie2JIN Gui-shan3HAN Juan4ZHANG Jian-feng5SHI Xiao6Beijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBeijing Research Institute of Uranium Geology, Beijing 100029, ChinaBACKGROUND 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.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012040158k-ar dilution dating40ar contentheating release timeabsorption timemelting temperature |
| spellingShingle | 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 Yankuang ceshi k-ar dilution dating 40ar content heating release time absorption time melting temperature |
| title | Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method |
| title_full | Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method |
| title_fullStr | Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method |
| title_full_unstemmed | Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method |
| title_short | Determination of Experimental Parameters during Measurement of 40Ar Content in K-Ar Dilution Method |
| title_sort | determination of experimental parameters during measurement of 40ar content in k ar dilution method |
| topic | k-ar dilution dating 40ar content heating release time absorption time melting temperature |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012040158 |
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