2.5ma以来黄土稳定碳同位素记录的植被覆盖度和季风变化:2.5ma以来黄土稳定碳同位素记录的植被覆盖度和季风变化

海洋地质与第四纪地质 Pub Date : 2014-03-06 DOI:10.3724/SP.J.1140.2013.01137

Pu Zhang, Weiguo Liu, X. Qiang

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引用次数: 1

摘要

洛川剖面有机碳同位素的δ13C值变化范围为-18.7‰~ 23.5‰，有机碳同位素的下核分布与冰期-间冰期尺度的磁化率变化趋势相似，可分为3个阶段。结果表明:①洛川地区植被覆盖度以C3和C4草地为主;②黄土层序的δ13C值较好地记录了冰期-间冰期尺度的夏季风变化和磁化率趋势。通过对段家坡剖面和渭南剖面有机碳同位素的对比，发现2.5 Ma以来存在两次明显的构造时间尺度转变。

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

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.

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来源期刊

海洋地质与第四纪地质

CiteScore

0.10

自引率

0.00%

发文量

4176

期刊介绍： Marine Geology and Quaternary Geology launched in 1981 is a bimonthly academic journal sponsored by Qingdao Institute of Marine Geology, China Geological Survey, and published by the Science Press, China.The journal aims to publish original, cutting-edge, and explorative scientific results in the field of marine geology and sea-land Quaternary geology. The journal focus on reporting the latest research achievements supported by National Natural Science Foundation Project, National Key Project and International Cooperation Project, with priority to the results in China seas, global ocean and three poles, and the comparative study results between offshore and land, regional and global scientific issues.