| Mantle Degassing and Diamond Genesis：A Carbon Isotope Perspective |
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| 引用本文： | 郑永飞.Mantle Degassing and Diamond Genesis：A Carbon Isotope Perspective[J].中国地球化学学报,1994,13(4):305-316. |
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| 作者姓名： | 郑永飞 |
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| 作者单位： | DepartmentofEarthandSpaceSciences.University,ofScienceandTechnologyofChina,Hefei,Anhui,230026 |
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| 摘 要： | The effect of Co2 and CH4 degassing from the mantle on the carbon isotopic composition of diamond has been quantitatively modeled in terms of the principles of Rayleigh distillation.Assuming the δ^13 C value of -5‰ for the mantle,the outgassing of CO2 can result in the large negative δ^13 C values of diamond,whereas the outgassing of CH4 can drive the δ^13C values of diamond in the positive direction.The theoretical expectations can be used to explain the full range of δ^13 C values from-34.4‰5 to 5‰ observed for natural diamonds.It is possible that diamond formation was triggered by the degassing of Co2 and/or CH4 from the mantle and the associated fractional crystallization of carbonate-bearing melt.
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| 关 键 词： | 金刚石 碳同位素 二氧化碳 成因 甲烷 |
Mantle degassing and diamond genesis: A carbon isotope perspective |
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| Zheng Yong-Fei.Mantle degassing and diamond genesis: A carbon isotope perspective[J].Chinese Journal of Geochemistry,1994,13(4):305-316. |
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| Authors: | Zheng Yong-Fei |
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| Institution: | (1) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, Anhui |
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| Abstract: | The effect of CO2 and CH4 degassing from the mantle on the carbon isotopic composition of diamond has been quantitatively modeled in terms of the principles
of Rayleigh distillation. Assuming the δ13C value of -5‰ for the mantle, the outgassing of CO2 can result in the large negative δ13C values of diamond, whereas the outgassing of CH4 can drive the δ13C values of diamond in the positive direction. The theoretical expectations can be used to explain the full range of δ13C values from -34.4‰ to +5‰ observed for natural diamonds. It is possible that diamond formation was triggered by the degassing
of CO2 and/ or CH4 from the mantle and the associated fractional crystallization of carbonate-bearing melt.
This study was financially supported by the Chinese Academy of Sciences within the framework of the project “Stable Isotope
Geochemistry of the Earth’s Crust and Mantle”. |
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| Keywords: | mantle degassing diamond genesis carbon isotope |
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