| 北京平原区晚更新世以来有机碳同位素特征及其古环境意义 |
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| 关键词:organic carbon isotope paleoclimate millennium-scale Late Pleistocene Beijing plain |
| 基金项目:中国地质大学地质过程与矿产资源重点实验室项目(编号: GPMR200605) |
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| Organic Carbon Isotopic Characteristics of Beijing Plain Since Late Pleistocene and Their Paleoenvironmental Implications |
| The organic carbon isotopic composition of sediments has been widely used to reconstruct paleoenvironment. An analysis of the organic carbon isotope in Changping borehole of Beijing plain, in comparison with the results from Greenland ice core and deep-sea oxygen isotope records, revealed the paleoenvironmental changes at the millennium scale in Beijing plain since the Late Pleistocene and their possible driving mechanism. The values of δ13Corg range from -17.10 ‰ to -26.18 ‰, with higher isotopic values indicating warmer periods. Accordingly, four climatic stages are evident, i.e., the warm last interglacial period (MIS5), the mild early glacial step (MIS4), the fluctuated interglacial step (MIS3) and the cold and dry late glacial step (MIS2). The millennial scale climatic instabilities over the Late Pleistocene were represented by the occurrence of nine strong Heinrich events shown by lower organic carbon isotope values. One probable reason for the different onsets might have been the contribution of local underlying factors, with topographic, hydrographic, and meteorological patterns being the predominant controls. |
| NI Zhi-yun,YANG Gui-fang,HUANG Jun-hua,ZHANG Xiao-jin,CHENG Jie,YIN Gong-ming.2011.Organic Carbon Isotopic Characteristics of Beijing Plain Since Late Pleistocene and Their Paleoenvironmental Implications[J].Acta Geoscientica Sinica,32(2):171-177. |
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