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The formation of iron oxides and magnetic enhancement mechanisms in northern Iranian loess-paleosol sequences: Evidence from diffuse reflectance spectrophotometry and temperature dependence of magnetic susceptibility

文献类型：期刊论文

作者Ghafarpour, Amin1; Khormali, Farhad1; Balsam, William2; Forman, Steven L.3; Cheng, Liangqing4; Song, Yougui4
刊名QUATERNARY INTERNATIONAL
出版日期2021-07-10
卷号589页码:68-82
ISSN号1040-6182
关键词Loess Diffuse reflectance spectrophotometry Temperature-dependent susceptibility Magnetic iron oxides Pedogenic maghemite-magnetite Northern Iran
DOI10.1016/j.quaint.2021.02.019
通讯作者Ghafarpour, Amin(aghafarpour@yahoo.com) ; Khormali, Farhad(fkhormali@gau.ac.ir)
英文摘要The magnetic properties of the loess-paleosol sequences from northern Iran provides a model for understanding pedogenic processes and their relationship to paleo-precipitation in this region. For the first time, we present diffuse reflectance spectrophotometry (DRS) analyses, color measurement analyses, and temperature-dependent susceptibility (chi-T) in argon from two late Pleistocene loess-paleosol sequences in northern Iran. Magnetic iron oxide minerals, principally magnetite, maghemite, hematite, and goethite were identified in the study sections. The results of DRS and color measurements show that a* values, the hematite to goethite ratio and the maghemite to hematite ratio, exhibit a significant positive correlation with the pedogenic process and paleosol formation and are superior to low-frequency susceptibility alone for estimating paleoprecipitation. Our data also indicates that pedogenic maghemite-magnetite formation and dissolution/reprecipitation are major contributors to the magnetic enhancement of loess-paleosol sequences and might indicate a seasonal aspect for pedogenic maghemite-magnetite formation. We propose the DRS-derived illite to chlorite ratio as a useful index for assessing the intensity of silicate mineral weathering in the northern Iranian loess-paleosol sequences. In addition, DRS can be used to discriminate between pedogenic and detrital hematite of loess-paleosol sequences. We also propose that the chi-T cooling and heating ratio model is a quantitative proxy for magnetic enhancement in soils and paleosols of loess-paleosol sequences.
WOS关键词CHINESE LOESS ; ORGANIC-MATTER ; GREAT-PLAINS ; QUANTIFYING PALEOPRECIPITATION ; CLIMATIC INTERPRETATION ; VISIBLE SPECTROSCOPY ; ENVIRONMENTAL-CHANGE ; DETERMINING HEMATITE ; SEDIMENT DISPERSAL ; MINERAL MAGNETISM
资助项目State Key Laboratory of Loess and Quaternary Geology[SKLLQGPY2006] ; International Partnership Program of the Chinese Academy of Sciences
WOS研究方向Physical Geography ; Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000647707100003
资助机构State Key Laboratory of Loess and Quaternary Geology ; International Partnership Program of the Chinese Academy of Sciences
源URL[http://ir.ieecas.cn/handle/361006/16512]  
专题地球环境研究所_古环境研究室
通讯作者Ghafarpour, Amin; Khormali, Farhad
作者单位1.Gorgan Univ Agr Sci & Nat Resources, Dept Soil Sci, Gorgan, Golestan, Iran
2.Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA
3.Baylor Univ, Dept Geosci, Geoluminescence Dating Res Lab, One Bear Pl 97354, Waco, TX 76798 USA
4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
推荐引用方式
GB/T 7714		 Ghafarpour, Amin,Khormali, Farhad,Balsam, William,et al. The formation of iron oxides and magnetic enhancement mechanisms in northern Iranian loess-paleosol sequences: Evidence from diffuse reflectance spectrophotometry and temperature dependence of magnetic susceptibility[J]. QUATERNARY INTERNATIONAL,2021,589:68-82.
APA Ghafarpour, Amin,Khormali, Farhad,Balsam, William,Forman, Steven L.,Cheng, Liangqing,&Song, Yougui.(2021).The formation of iron oxides and magnetic enhancement mechanisms in northern Iranian loess-paleosol sequences: Evidence from diffuse reflectance spectrophotometry and temperature dependence of magnetic susceptibility.QUATERNARY INTERNATIONAL,589,68-82.
MLA Ghafarpour, Amin,et al."The formation of iron oxides and magnetic enhancement mechanisms in northern Iranian loess-paleosol sequences: Evidence from diffuse reflectance spectrophotometry and temperature dependence of magnetic susceptibility".QUATERNARY INTERNATIONAL 589(2021):68-82.

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来源：地球环境研究所

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