| 环境同位素记录中共生碳酸盐氧同位素分馏差值的影响 |
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| 引用本文： | 曾承,余俊清.环境同位素记录中共生碳酸盐氧同位素分馏差值的影响[J].盐湖研究,2004,12(2):14-18. |
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| 作者姓名： | 曾承 余俊清 |
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| 作者单位： | 中国科学院青海盐湖研究所西安二部,陕西,西安,710043 |
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| 基金项目： | 中科院青海盐湖所创新领域前沿项目(CX200302)，国家自然科学基金面上项目(49971074)，中科院资环创新重大项目(KZCX1-Y-05) |
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| 摘 要： | 湖泊化学沉积碳酸盐δ18O是研究区域气候演变的重要环境指标之一。青海湖等闭流湖泊的研究结果证实,在对δ18O环境记录进行共生碳酸盐氧同位素分馏效应校正时,应依据具体情况,采用0-1‰的分馏差值。由高温实验结果推断出的常温分馏差值(4‰-7‰)不能被应用到自然条件下湖泊共生碳酸盐氧同位素分馏效应的校正。
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| 关 键 词： | 环境同位素 共生碳酸盐 氧同位素分馏 青海湖 |
| 文章编号： | 1008-858X(2004)02-0014-05 |
| 修稿时间： | 2003年9月29日 |
Effect of Oxygen Stable-Isotope Fractionation between Co-existing Carbonates on Environmental Isotopic Record |
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| ZENG Cheng,YU Jun-qing.Effect of Oxygen Stable-Isotope Fractionation between Co-existing Carbonates on Environmental Isotopic Record[J].Journal of Salt Lake Research,2004,12(2):14-18. |
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| Authors: | ZENG Cheng YU Jun-qing |
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| Abstract: | δ~(18)O of lacustrine inorganic carbonates is one of the important environmental proxies for the study of regional climatic evolution.Results from Lake Qinghai and other closed-basin lakes indicate that isotope fractionation between co-existing carbonates formed naturally in lake environments is minimum.The fractionation differences of 4‰～7‰ in δ~(18)O between dolomite and calcite,obtained based on elevated-temperature experiments and extrapolations to temperatures at 20℃～25℃,are not applicable to the carbonates formed in natural environments.The fractionation differences of 0～1‰ are recommended for calibrating a possible disparity between co-existing carbonates in lacustrine isotopic records. |
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| Keywords: | Environmental isotope Co-existing carbonates Oxygen isotopic fractionation Lake Qinghai |
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