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

doi:10.1016/j.quaint.2021.02.019

IEECAS OpenIR > 古环境研究室

	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
	Ghafarpour, Amin 1; Khormali, Farhad 1; Balsam, William 2; Forman, Steven L.3; Cheng, Liangqing 4; Song, Yougui4
通讯作者	Ghafarpour, Amin(aghafarpour@yahoo.com) ; Khormali, Farhad(fkhormali@gau.ac.ir)
	2021-07-10
发表期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
卷号	589 页码:68-82
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.
关键词	Loess Diffuse reflectance spectrophotometry Temperature-dependent susceptibility Magnetic iron oxides Pedogenic maghemite-magnetite Northern Iran
DOI	10.1016/j.quaint.2021.02.019
关键词[WOS]	CHINESE LOESS ; ORGANIC-MATTER ; GREAT-PLAINS ; QUANTIFYING PALEOPRECIPITATION ; CLIMATIC INTERPRETATION ; VISIBLE SPECTROSCOPY ; ENVIRONMENTAL-CHANGE ; DETERMINING HEMATITE ; SEDIMENT DISPERSAL ; MINERAL MAGNETISM
收录类别	SCI ; SCI
语种	英语
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
项目资助者	State Key Laboratory of Loess and Quaternary Geology ; International Partnership Program of the Chinese Academy of Sciences
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000647707100003
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16513
专题	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.