caa a22 4500 445300108 CHVBK 20180317142554.0 cr unu---uuuuu 170323e20100301xx s 000 0 eng 10.1007/s11430-010-0011-5 doi (NATIONALLICENCE)springer-10.1007/s11430-010-0011-5 Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau [Elektronische Daten] [YouGui Song, ZhengTao Shi, XiaoMin Fang, JunSheng Nie, Ishikawa Naoto, XiaoKe Qiang, XuLong Wang] Over the past two decades, magnetoclimatological studies of loess-paleosol sequences in the Chinese Loess Plateau (CLP) have made outstanding achievements, which greatly promote the understanding of East Asian paleomonsoon evolution, inland aridification of Asia, and past global climate changes. Loess magnetic properties of the CLP have been well studied. In contrast, loess magnetic properties from outside the CLP in China have not been fully understood. We have little knowledge about the magnetic properties of loess in the Ili Basin, an intermontane depression of the Tianshan (or Tien Shan) Mountains. Here, we present the results of rock magnetic measurements of the Ili loess including mass magnetic susceptibility (χ) and anhysteretic remanent magnetization (ARM), high/low temperature dependence of susceptibility (TDS) and hysteresis, as well as X-ray diffraction (XRD) for mineral analysis. Based on the comparison with loess-paleosol sequences in the CLP (hereafter referred to as the Chinese loess), we discuss the possible magnetic susceptibility enhancement mechanism of the Ili loess. The results show that 1) the total magnetic mineral concentration of the Ili loess is far lower than that of the Chinese loess, though they have similar magnetic mineral compositions. The ferrimagnetic minerals in the Ili loess are magnetite and maghemite, and the antiferromagnetic mineral is hematite; XRD analysis also identifies the presence of ilmenite. The ratio of maghemite is lower in the Ili loess than in the Chinese loess, but the ratios of magnetite and hematite are higher in the Ili loess than in the Chinese loess. 2) The granularity of magnetic minerals in the Ili loess, dominated by pseudo-single domain (PSD) and multi-domain (MD) grains, is generally much coarser than that of the Chinese loess. Ultrafine pedogenically-produced magnetic grains have a very limited contribution to the susceptibility enhancement. Rather, PSD and MD particles of magnetite and maghemite are the main contributors to the enhancement of susceptibility in the Ili loess. 3) The susceptibility enhancement mechanism for the Ili loess is complicated and superimposes both a wind velocity/vigor model (Alaskan or Siberian model) and the in situ ultrafine grain pedogenic model; the former might play an important role in the Ili loess. 4) Magnetic susceptibility enhancements of the Ili loess are related not only to the eolian input of the source area, but also to the local climate, landform, and geological background. Therefore, great care should be taken when reconstructing paleoclimate using magnetic susceptibility data from the Ili loess. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 loess nationallicence magnetic property nationallicence magnetic susceptibility nationallicence the Ili Basin nationallicence the Chinese Loess Plateau nationallicence Song YouGui State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut Shi ZhengTao School of Tourism and Geography, Yunnan Normal University, 650092, Kunming, China aut Fang XiaoMin Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut Nie JunSheng Jackson School of Geosciences, University of Texas at Austin, 78712, Austin, TX, USA aut Naoto Ishikawa Graduate School of Human and Environmental Studies, Kyoto University, 606-8501, Kyoto, Japan aut Qiang XiaoKe State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut Wang XuLong State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut Science China Earth Sciences SP Science China Press 53/3(2010-03-01), 419-431 1674-7313 53:3<419 2010 53 11430 https://doi.org/10.1007/s11430-010-0011-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0011-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Song YouGui State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut NATIONALLICENCE 700 1- Shi ZhengTao School of Tourism and Geography, Yunnan Normal University, 650092, Kunming, China aut NATIONALLICENCE 700 1- Fang XiaoMin Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085, Beijing, China aut NATIONALLICENCE 700 1- Nie JunSheng Jackson School of Geosciences, University of Texas at Austin, 78712, Austin, TX, USA aut NATIONALLICENCE 700 1- Naoto Ishikawa Graduate School of Human and Environmental Studies, Kyoto University, 606-8501, Kyoto, Japan aut NATIONALLICENCE 700 1- Qiang XiaoKe State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut NATIONALLICENCE 700 1- Wang XuLong State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075, Xi'an, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/3(2010-03-01), 419-431 1674-7313 53:3<419 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer