| 白云母、高岭石矿物中羟基的o同位素分析方法研究 |
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| 关键词:oxygen isotope of hydroxyl groups heating by fire flame single mineral thermometers |
| 基金项目:国家自然科学基金 |
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| 摘要: |
| A Study on Determining Oxygen Isotope of Hydroxyl Groups from Muscovite and Kaolinit |
| The internal oxygen isotope fractionation between silicon oxygen tetrahedra and hydroxyl groups of hydrosilicates may be greater than that between any other coexisting minerals in the same temperature range The temperature dependency of the internal oxygen isotope fractionation is also much greater Such fractionation is considered to be a potential single mineralgeothermometer, which has more advantages than the isotope geothermometer of coexisting minerals The accurate measurement of the oxygen isotope composition of hydroxyl groups is the key of setting up the single mineral geothermometer A new method of accurate analysis of the oxygen isotope composition of hydroxyl groups is reported in this paper Samples were heated by fire flame under vacuum up to 1400℃,and the water extracted from hydroxyl bearing minerals was immediately frozen in a nickel tube with liquid nitrogen Then water samples reacted with BrF 5 to liberate O 2 for isotopic analysis The analytical reproducibility of the δ 18 O OH is in the range of 0 3‰ The yield of water during extraction is in the range from 99% to 100% The experimental results show that there occurs no isotopic dynamic fractionation during dehydroxylation of the examined kaolinite and muscovite,nor oxygen isotope exchange between quartz glasses and water extracted from hydroxyl groups. |
| LI Yan-he,JIANG Shao-yong.1999.A Study on Determining Oxygen Isotope of Hydroxyl Groups from Muscovite and Kaolinit[J].Acta Geoscientica Sinica,20(1):63-66. |
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