globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.04.030
论文题名:
High-resolution enviromagnetic records of the last deglaciation from Dali Lake, Inner Mongolia
作者: Liu S.; Deng C.; Xiao J.; Li J.; Paterson G.A.; Chang L.; Yi L.; Qin H.; Zhu R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 454
起始页码: 1
结束页码: 11
语种: 英语
英文关键词: Dali Lake ; Environmental magnetism ; Last deglaciation ; Paleoclimate ; Semi-arid East Asia
英文摘要: Detailed paleoclimate records during the last deglaciation are highly valuable for understanding rapid climatic changes and mechanisms during extremely variable conditions. High-resolution paleoclimate research in the semi-arid East Asian interior is essential due to its sensitivity to climate variability and importance for human inhabitance. A high-resolution environmental magnetic investigation has been performed on a sedimentary sequence from Dali Lake in central Inner Mongolia, which covers the period of 15.90-11.46 ka. Variable magnetic mineral sources are identified based on integrated rock magnetic analysis of both core sediments and catchment samples, complemented by scanning electron telescope and transmission electron telescope observation and X-ray diffraction analysis. The studied core is magnetically divided into four units: Magnetic minerals in Unit 1 (11.83-11.5 m, 15.90-15.32 ka) are mainly sourced from bedrock erosion of basalts in the catchment. This period corresponds to rapid climate fluctuations after the Last Glacial Maximum. In Unit 2 (11.50-9.50 m, 15.32-12.67 ka) and Unit 3 (9.50-8.59 m, 12.67-11.56 ka), pseudo-single domain magnetites from erosion of surface soils are the main magnetic carriers. These two units coincide within time error with the Bølling-Allerød warm period and the Younger Dryas cold period, respectively, and can be correlated with stalagmite and ice core records. Our findings reflect contrasting erosion processes during cold and warm periods in the lake catchment, which were ultimately controlled by climate changes during the last deglaciation. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68400
Appears in Collections:过去全球变化的重建

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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia

Recommended Citation:
Liu S.,Deng C.,Xiao J.,et al. High-resolution enviromagnetic records of the last deglaciation from Dali Lake, Inner Mongolia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,454
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