| 逐级温度热解法在黄土古土壤样品~(14)C测年中的应用 |
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| 引用本文： | 程鹏,吴书刚,杜花,陈清敏,卢雪峰.逐级温度热解法在黄土古土壤样品~(14)C测年中的应用[J].干旱区资源与环境,2012(12):81-85. |
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| 作者姓名： | 程鹏 吴书刚 杜花 陈清敏 卢雪峰 |
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| 作者单位： | 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室;西安加速器质谱中心;中国科学院研究生院 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目(2010CB833400);国家自然科学基金项目(41023006)资助 |
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| 摘 要： | 利用已知可靠年代的黄土古土壤样品,采用逐级热解的方法,获取不同温度下的热解组分,运用加速器14C测年技术,测试各个组分的14C年龄,探讨获得可靠测年组分所需的逐步解热的实验条件。研究表明,逐级热解过程中,100℃～600℃温度段的热解挥发组分为年轻碳,而600℃～800℃温度段热解残余物(Py-R)则为老碳,600℃～800℃热解挥发组分(Py-V)是黄土-古土壤14C测年的可靠组分。
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| 关 键 词： | 14C测年 测年物质 逐级热解 黄土古土壤 |
The application of temperature-step-pyrolyzing to 14C dating of Loess paleosoil sample |
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| CHENG Peng,WU Shugang,DU Hua,CHEN Qingming,LU Xuefeng.The application of temperature-step-pyrolyzing to 14C dating of Loess paleosoil sample[J].Journal of Arid Land Resources and Environment,2012(12):81-85. |
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| Authors: | CHENG Peng WU Shugang DU Hua CHEN Qingming LU Xuefeng |
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| Institution: | 1,2(1.State Key Lab Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,No.10 Fenghui South Road,Hi-tech Zone,Xi’an 710075,P.R.China;2.Xi’an AMS Center,Xi’an 710043,P.R.China;3.Graduate School of the Chinese Academy of Sciences,Beijing 100039,P.R.China) |
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| Abstract: | The effective chemical pretreatment at the beginning is very important for acquiring the reliable 14C ages.We present a method in which pyrolysis-combustion is carried out to partition SOM(soil organic matter) into pyrolytic volatile(Py-V) and pyrolytic residue(Py-R) fractions.We got different pyrolytic residue(Py-R) fractions from different pyrolytic temperatures 200℃,400℃,600℃ and 800℃C,and dated corresponding 14C age of the Py-R fractions and Py-V fractions by Accelerator Mass Spectrometer(AMS).The results show that the dated age increases as temperature increases and the ages of Py-V fractions are younger than ages of the Py-R fractions.Most of the young carbon in the Py-V fractions are extracted at 100℃-600℃,and old carbon in the Py-R fractions are extracted at 600℃-800℃.Further experiments show that,the Py-V organic carbon extracted at 800℃ represent the reliable ages for the sediments,and the method of temperature-step-pyrolyzing provides us a new way to understand the condition of contamination and evaluate the reliability of age. |
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| Keywords: | 14C AMS dating dating material temperature-step-pyrolyzing Loess-paleosoil |
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