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Variation of soil Δδ^13C values in Xifeng loess-paleosol sequence and its paleoenvironmental implication

ISSN号：1000-0550
期刊名称：《沉积学报》
时间：0
分类：P53[天文地球—古生物学与地层学;天文地球—地质学]
作者机构：[1]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China, [2]Graduate School of Chinese Academy of Sciences, Beijing 100039,China, [3]College of Energy and Power Engineering, Xi'an Jiaotong University. Xi'an 710049, China
相关基金：The authors are grateful to Drs. Wu Zhenkun and Song Shaohua for help during field work. The manuscript was improved by Dr. Wang Hong and an anonymous reviewer. This work was supported by the National Natural Science Foundation of China （Grant Nos. 40599422, 40523002 ＆ 40121303） and the National Key Funds of China （Grant No. 2004CB720200）.

作者： NING Youfeng[1,2], LIU Weiguo[1,3], AN Zhisheng[1]

关键词：黄土, 古土壤, 有机碳, 碳酸盐, 碳同位素, loess-paleosol, organic carbon, carbonate, carbon isotope.

中文摘要：

土壤有机物(SOM ) 和在 Xifeng loess-paleosol 的全部的碳酸盐(TC ) 的同位素的作文定序的碳被学习了。delta~(13 )C_(SOM ) 价值每千每千从 -23.8 变化到 -20.2，它是更高的在比在冰川的阶段间冰期。与 C_(SOM ) 珍视的 delta~(13 ) 相反， delta~(13 )C_(Tc ) 价值每千每千从 -8.5 变化到 -3.6 并且是更低的在比在冰川的阶段间冰期。C_(SOM ) 和 C_(TC ) 珍视的 delta~(13 ) 每千每千从 14.1 改变到 19.4 的 delta~(13 ) 之间的差别(三角洲 delta~(13 )) 。我们从 Xifeng loess-paleosol 顺序的结果显示 DELTA delta~(13 ) 价值代表主要碳酸盐(PC ) 的比率到第二等的碳酸盐(SC ) 。三角洲 delta~(13 ) 价值在黄土阶段高，并且最大的 PC-to-SC 比率装 reach6:4。但是在 paleosol 上演， DELTA delta~(13 ) 值是低的，与 PC 的一个小比例。因为灰尘包含 PC，在 loess-paleosol 顺序的三角洲 delta~(13 ) 价值也在中国黄土高原显示灰尘的贡献到黄土沉积。

英文摘要：

The carbon isotopic compositions of soil organic matter （SOM） and total carbonate （TC） in Xifeng Ioess-paleosol sequence have been studied. The δ^13CsoM values vary from -23.8‰ to -20.2‰, which are higher in interglacial than in glacial stages. Contrary to δ^13Csoi values, the δ^13CTc values vary from -8.5‰ to -3.6‰ and are lower in interglacial than in glacial stages. The differences （△δ^13C） between the δ^13CsoM and δ^13CTc values vary from 14.1‰ to 19.4‰. Our results from the Xifeng loesspaleosol sequence indicate that the △δ^13C values represent the ratio of primary carbonate （PC） to secondary carbonate （SC）. The △δ^13C values were high in the loess stages, and the maximal PC-to-SC ratio can reach 6：4. But in the paleosol stages, the △δ^13C values were low, with a small proportion of PC. The △δ^13C values in Ioess-paleosol sequence also indicate the contributions of the dust to the loess sediment in the Chinese Loess Plateau because the dust contains the PC.

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