Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS
Carbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions. Carbon stable isotope compositions in cements can be used to indicate the source of carbon in diagenetic fluids, while oxygen stable i...
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Editorial Board of Journal of Chinese Mass Spectrometry Society
2022-03-01
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| Series: | Zhipu Xuebao |
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| Online Access: | http://www.jcmss.com.cn/CN/article/openArticlePDF.jsp?attachType=PDF&id=3061 |
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| author | HAN Juan LIU Han-bin JIN Gui-shan ZHANG Jian-feng LI Jun-jie ZHANG jia SHI Xiao |
| author_facet | HAN Juan LIU Han-bin JIN Gui-shan ZHANG Jian-feng LI Jun-jie ZHANG jia SHI Xiao |
| author_sort | HAN Juan |
| collection | DOAJ |
| description | Carbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions. Carbon stable isotope compositions in cements can be used to indicate the source of carbon in diagenetic fluids, while oxygen stable isotope can be used to estimate the temperature and the source of fluid at the time of crystallization. In order to obtain the carbon and oxygen isotope compositions of different kinds of carbonates in sandstone cements, off-line selective acid extraction method was usually used to extract and test the carbon and oxygen isotope compositions of each carbonate. In order to overcome the shortcomings of the off-line method such as cumbersome process and low efficiency, the temperature and time experiments of the reaction of the mixture sample with 100% phosphoric acid were carried out for the first time by using Gasbench-IRMS with different ratios of quartz, calcite and dolomite mixture samples in this study. When the particle size of the sample is mainly about 63-75 μm, the reaction temperature is 25 ℃ and the reaction time is 2 h, the generated CO2 represents the carbon and oxygen isotopic compositions of calcite. When the reaction temperature is 25 ℃, there is almost no CO2 generated in reaction of dolomite with 100% phosphoric acid for 1 h, and the yield of CO2 is only about 3% for 2 h. The mixture experiment showed that this method is only suitable for the mixture samples with more calcite than dolomite. When the content of calcite is higher than that of dolomite, Gasbench-IRMS can be used to separate calcite and dolomite mixture samples online, and test C and O isotope compositions. The carbon dioxide produced at 25 ℃ for 2 h represents the C and O isotope compositions of calcite. The CO2 gas is removed after another 2 h of reaction, then the carbon dioxide produced at 50 ℃ for 18 h represents δ13C and δ18O of dolomite. The precision of δ13C and δ18O is better than 0.15‰ (1σ) and 0.20‰ (1σ), respectively. |
| first_indexed | 2024-04-13T06:10:44Z |
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| id | doaj.art-5ef84c37862d43c7a3d4aaa286d4ebf0 |
| institution | Directory Open Access Journal |
| issn | 1004-2997 |
| language | English |
| last_indexed | 2024-04-13T06:10:44Z |
| publishDate | 2022-03-01 |
| publisher | Editorial Board of Journal of Chinese Mass Spectrometry Society |
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| series | Zhipu Xuebao |
| spelling | doaj.art-5ef84c37862d43c7a3d4aaa286d4ebf02022-12-22T02:59:05ZengEditorial Board of Journal of Chinese Mass Spectrometry SocietyZhipu Xuebao1004-29972022-03-0143221021910.7538/zpxb.2021.0071Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMSHAN Juan0LIU Han-bin1JIN Gui-shan2ZHANG Jian-feng3LI Jun-jie4ZHANG jia5SHI Xiao6Beijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyBeijing Research Institute of Uranium GeologyCarbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions. Carbon stable isotope compositions in cements can be used to indicate the source of carbon in diagenetic fluids, while oxygen stable isotope can be used to estimate the temperature and the source of fluid at the time of crystallization. In order to obtain the carbon and oxygen isotope compositions of different kinds of carbonates in sandstone cements, off-line selective acid extraction method was usually used to extract and test the carbon and oxygen isotope compositions of each carbonate. In order to overcome the shortcomings of the off-line method such as cumbersome process and low efficiency, the temperature and time experiments of the reaction of the mixture sample with 100% phosphoric acid were carried out for the first time by using Gasbench-IRMS with different ratios of quartz, calcite and dolomite mixture samples in this study. When the particle size of the sample is mainly about 63-75 μm, the reaction temperature is 25 ℃ and the reaction time is 2 h, the generated CO2 represents the carbon and oxygen isotopic compositions of calcite. When the reaction temperature is 25 ℃, there is almost no CO2 generated in reaction of dolomite with 100% phosphoric acid for 1 h, and the yield of CO2 is only about 3% for 2 h. The mixture experiment showed that this method is only suitable for the mixture samples with more calcite than dolomite. When the content of calcite is higher than that of dolomite, Gasbench-IRMS can be used to separate calcite and dolomite mixture samples online, and test C and O isotope compositions. The carbon dioxide produced at 25 ℃ for 2 h represents the C and O isotope compositions of calcite. The CO2 gas is removed after another 2 h of reaction, then the carbon dioxide produced at 50 ℃ for 18 h represents δ13C and δ18O of dolomite. The precision of δ13C and δ18O is better than 0.15‰ (1σ) and 0.20‰ (1σ), respectively.http://www.jcmss.com.cn/CN/article/openArticlePDF.jsp?attachType=PDF&id=3061calcitedolomitecarbon and oxygen isotope compositionsselective acid extraction |
| spellingShingle | HAN Juan LIU Han-bin JIN Gui-shan ZHANG Jian-feng LI Jun-jie ZHANG jia SHI Xiao Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS Zhipu Xuebao calcite dolomite carbon and oxygen isotope compositions selective acid extraction |
| title | Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS |
| title_full | Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS |
| title_fullStr | Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS |
| title_full_unstemmed | Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS |
| title_short | Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS |
| title_sort | carbon and oxygen isotope analysis of calcite and dolomite mixtures using selective acid extraction by gasbench irms |
| topic | calcite dolomite carbon and oxygen isotope compositions selective acid extraction |
| url | http://www.jcmss.com.cn/CN/article/openArticlePDF.jsp?attachType=PDF&id=3061 |
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