巴里坤湖孢粉浓缩物<sup>14</sup>C测年可行性研究

郑同明; 赵家驹; 安成邦; 陶士臣; 吕雁斌; 王宗礼

doi:10.3724/SP.J.1140.2010.01083

巴里坤湖孢粉浓缩物¹⁴C测年可行性研究

兰州大学西部环境教育部重点实验室, 兰州 730000

基金项目:

国家自然科学基金项目(90502008,40871006,40721061)

详细信息

作者简介:
郑同明(1984-),男,硕士生,从事全新世气候变化的湖泊研究,E-mail:zhengtm07@lzu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2009-01-01
- 修回日期: 2009-09-14

STUDY OF POLLEN CONCENTRATES FOR AMS ¹⁴C DATING IN BARKOL LAKE

Key Laboratory of Western China's Environmental Systems of Ministry of Education, College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000, China

摘要

摘要: ¹⁴C测年是湖泊沉积物定年的主要方法之一,随着对过去气候环境变化的深入研究,对于湖泊样品中的年代要求更高,而不同的测年物质的¹⁴C定年结果,会有不同的误差。通过对巴里坤湖部分样品,分别进行块状样有机质、陆生高等植物残体以及孢粉浓缩物定年比较,以探讨干旱区湖泊中¹⁴C定年的方法。测试结果表明:孢粉浓缩物与陆生高等植物残体的测年值极为接近,在西北干旱区湖泊测年过程中,孢粉浓缩物有望成为一种可靠的测年材料。在探讨湖泊沉积物年代的"碳库"效应时,孢粉浓缩物定年可能会成为一种有效的方法。
- 湖泊沉积物 /
- 孢粉浓缩物 /
- ¹⁴C测年 /
- 巴里坤湖
Abstract: The in-depth model study of Holocene climatic and environmental change requires more exact strata age in the lake. However, the ¹⁴C dating of lake sediments is one of the main methods for dating, and different methods of ¹⁴C dating result in various inaccuracy. To explore more reasonable ways of ¹⁴C dating of the lakes in arid areas, based on some samples of Barkol Lake, the article compared the pollen concentrates for AMS ¹⁴C dating, the whole sample analysis method for ¹⁴C dating and the terrestrial higher plant residues for ¹⁴C dating. Our dating results reveal that AMS ¹⁴C ages of the pollen concentrates are consistently 780 years older than those of the whole samples in the same layer, which is similar to the "carbon pool" effect calculated through the ¹⁴C ages of whole samples subtract the ¹⁴C ages of terrestrial higher plant residues; for the AMS ¹⁴C ages of the pollen concentrates are very close to the ¹⁴C ages of terrestrial higher plant residues, the pollen concentrates are expected to be reliable dating material in the dating process of the lakes in arid areas.
- lake sediments /
- pollen concentrates /
- AMS ¹⁴C dating /
- Barkol Lake

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参考文献(18)

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