2.5 Ma以来黄土稳定同位素记录的植被及夏季风变化

张普; 刘卫国; 强小科

doi:10.3724/SP.J.1140.2013.01137

2.5 Ma以来黄土稳定同位素记录的植被及夏季风变化

1. 西北大学城市与环境学院, 西安 710127;

2. 中国科学院地球环境研究所黄土与第四纪国家重点实验室, 西安 710075;

3. 西安交通大学人居与环境学院, 西安 710049

基金项目:
科技部全球变化专项项目(2013CB955902)；国家自然科学基金项目(41203003)；西北大学博士科研启动金项目(PR10056)；黄土与第四纪地质国家重点实验室开放基金课题(SKLLQG1019)

详细信息

作者简介: 张普(1982-),女,讲师,第四纪地质专业,E-mail:zhangpu@nwu.edu.cn

中图分类号: P532

收稿日期: 2012-08-19

修回日期: 2012-10-23

VEGETATION COVERAGE AND MONSOON VARIATION RECORDED BY STABLE CARBON ISOTOPE OF LOES SINCE 2.5MA

1. College of Urban and Environmental Science, Northwest University, Xi'an 710127, China;

2. State Key Lab of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;

3. School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received Date: 19 August 2012

Revised Date: 23 October 2012

摘要

摘要: 洛川剖面2.5 Ma以来有机碳同位素组成显示δ13C值的变化范围为-18.7%~-23.5‰;剖面有机碳同位素变化可分为3个阶段,均与磁化率曲线对应且呈现一致的冰期-间冰期波动。表明研究区第四纪以来主要为C3植物为主的C3、C4混合草原植被类型;黄土序列有机碳同位素δ13C值对应磁化率曲线在冰期-间冰期尺度上较好地记录了夏季风强度变化;与段家坡和渭南剖面有机碳结果对比显示,2.5 Ma以来3个剖面在构造尺度上均出现了两次明显的转变。
- 有机碳δ¹³C /
- 黄土剖面 /
- C₃/C₄植物 /
- 东亚夏季风
Abstract: The organic carbon isotopes of the Luochuan section show that the δ13C values vary from -18.7‰ to -23.5‰, and the downcore distribution of organic carbon isotope could be divided into three stages with similar trends with the magnetic susceptibility in the glacial-interglacial scales. The results demonstrate that 1) the vegetation coverage in the Luochuan area was mainly a mixture of C3 and C4 grassland, 2) the δ13C value of loess sequence better recorded the summer monsoon change in the glacial-interglacial scales just as magnetic susceptibility trend. Comparing with the organic carbon isotope of the Duanjiapo and Weinan sections, two times of evident transition on tectonic time scales are recognized since 2.5 Ma.
- organic carbon isotope /
- loess section /
- C₃/C₄ plants /
- the East Asian summer monsoon

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2.5 Ma以来黄土稳定同位素记录的植被及夏季风变化

1. 西北大学城市与环境学院, 西安 710127; 2. 中国科学院地球环境研究所黄土与第四纪国家重点实验室, 西安 710075; 3. 西安交通大学人居与环境学院, 西安 710049

作者简介: 张普(1982-),女,讲师,第四纪地质专业,E-mail:zhangpu@nwu.edu.cn

VEGETATION COVERAGE AND MONSOON VARIATION RECORDED BY STABLE CARBON ISOTOPE OF LOES SINCE 2.5MA

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目录

1. 西北大学城市与环境学院, 西安 710127;

2. 中国科学院地球环境研究所黄土与第四纪国家重点实验室, 西安 710075;

3. 西安交通大学人居与环境学院, 西安 710049