Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling
文献类型:期刊论文
作者 | Deng, CL; Shaw, J; Liu, QS; Pan, YX; Zhu, RX |
刊名 | EARTH AND PLANETARY SCIENCE LETTERS |
出版日期 | 2006-01-15 |
卷号 | 241期号:1-2页码:248-259 |
ISSN号 | 0012-821X |
关键词 | Chinese Loess Plateau Loess paleosol mineral magnetism magnetoclimatology Asian aridification and cooling |
DOI | 10.1016/j.epsl.2005.10.020 |
文献子类 | Article |
英文摘要 | A high-resolution mineral magnetic investigation has been carried out on the Jingbian loess/paleosol sequence at the northern extremity of the Chinese Loess Plateau. Results show that the magnetic assemblage is dominated by large pseudo-single domain and multidomain-like magnetite with associated maghemite and hematite. Variations in the ratios of SIRM(100mT)/SIRM, SIRM(100mT)/SIRM(30mT) and SIRM(100mT)/SIRM(60mT) (SIRM is the saturation isothermal remanent magnetization; SIRM(nmT) represents the residual SIRM after an n mT alternating field demagnetization) have been used to document regional paleoclimate change in the Asian interior by correlating the mineral magnetic record with the composite delta(18)O record in deep-sea sediments. The long-term up-section decreasing trend in those ratios in both loess and paleosol units has been attributed to a long-term decrease in the relative contributions of eolian hematite during glacial extrema and of pedogenic hematite during interglacial extrema, respectively, which reveals a long-term decreasing trend in chemical weathering intensity in both glacial-stage source region (the Gobi and deserts in northwestern China) and interglacial-stage depositional area (the Loess Plateau region). We further relate this long-timescale variation to long-term increasing aridification and cooling, during both glacial extrema in the dust source region and interglacial extrema in the depositional area, over the Quaternary period. Changes in those ratios are most likely due to Quaternary aridification and cooling driven by ongoing global cooling, expansion of the Arctic ice-sheet, and progressive uplift of the Himalayan-Tibetan complex during this period. (c) 2005 Elsevier B.V. All rights reserved. |
WOS关键词 | TEMPERATURE-DEPENDENT SUSCEPTIBILITY ; PALEOCLIMATIC IMPLICATIONS ; PALEOSOL SEQUENCES ; HYSTERESIS LOOPS ; GRAIN-SIZE ; MYR AGO ; DEPOSITS ; CLIMATE ; RECORD ; PEDOGENESIS |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000234626300019 |
源URL | [http://ir.iggcas.ac.cn/handle/132A11/66360] |
专题 | 中国科学院地质与地球物理研究所 |
通讯作者 | Deng, CL |
作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab, SKL LE, Beijing 100029, Peoples R China 2.Univ Liverpool, Dept Earth & Ocean Sci, Geomagnetism Lab, Liverpool L69 7ZE, Merseyside, England 3.Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA |
推荐引用方式 GB/T 7714 | Deng, CL,Shaw, J,Liu, QS,et al. Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling[J]. EARTH AND PLANETARY SCIENCE LETTERS,2006,241(1-2):248-259. |
APA | Deng, CL,Shaw, J,Liu, QS,Pan, YX,&Zhu, RX.(2006).Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling.EARTH AND PLANETARY SCIENCE LETTERS,241(1-2),248-259. |
MLA | Deng, CL,et al."Mineral magnetic variation of the Jingbian loess/paleosol sequence in the northern Loess Plateau of China: Implications for Quaternary development of Asian aridification and cooling".EARTH AND PLANETARY SCIENCE LETTERS 241.1-2(2006):248-259. |
入库方式: OAI收割
来源:地质与地球物理研究所
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