干旱区生态环境知识资源中心(Arid): Clay mineralogy and geochemistry of the Lower Pleistocene Loess in the Iranian Loess Plateau (Agh Band section) and implications for its provenance and paleoclimate change

Arid

DOI	10.1016/j.quaint.2019.09.011
	Clay mineralogy and geochemistry of the Lower Pleistocene Loess in the Iranian Loess Plateau (Agh Band section) and implications for its provenance and paleoclimate change
	Taheri, Mehdi; Khormali, Farhad; Wang, Xin; Amini, Arash; Landi, Ahmad; Wei, Haitao; Kehl, Martin; Chen, Fahu
通讯作者	Khormali, F
来源期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2020
卷号	552 页码:91-99
英文摘要	The clay mineralogy and geochemistry of loess is sensitive to variations in sediment source area, transport processes and weathering regime over time, and thus careful study of them can provide some insight into past climate variability. The well-known loess-paleosol sequences (Upper Pleistocene Loess (UPL)) on the Iranian Loess plateau (ILP) are generally underlain by the red deposits consisting of reddish clay to silt-sized sediments of wind-blown origin (Lower Pleistocene Loess (LPL)). Study and analyzing of this oldest brown and reddish brown loess has a specific role in paleoclimate reconstruction but no previous study of the clay mineralogical and geochemical characteristics of them has been performed to date. Therefore, total (Fe-t) and free iron (Fe-d) concentrations and Fe-d/Fe-t ratios, X-ray diffraction as well as geochemical analysis were carried out on a section near the Agh Band village in northeastern province Golestan. Geochemical analysis revealed the same provenance of all deposits in LPL and similarity of them by UPL. X-ray diffraction detected the kaolinite, smectite, chlorite, illite, vermiculite, mica-vermiculite and mica-smectite minerals in the red deposits. The results demonstrated that detrital input is the main source of kaolinite, chlorite and illite, while pedogenic formation during the early Pleistocene could be the dominant cause of smectite and vermiculite occurrences in the LPL. The presence of smectite and vermiculite is in accordance with the xeric and udic soil moisture regime in UPL, respectively. As such it can be concluded that the climate at the time of Agh Band LPL formation varied from semi-arid to sub-humid climate and wetter and more favorable conditions than the overlying late Pleistocene loess and modern soils. These results are confirmed by Al2O3/Na2O, Na2O/K2O, MgO/TiO2 and Fe-d/Fe-t ratios.
英文关键词	Clay mineralogy Geochemistry Paleoclimate Lower Pleistocene loess Iran
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000573017600002
WOS关键词	CHINESE LOESS ; GRAIN-SIZE ; MAGNETIC-SUSCEPTIBILITY ; ISOTOPE GEOCHEMISTRY ; CHEMICAL-COMPOSITION ; PALEOSOL SEQUENCE ; DEPOSITS ; CLIMATE ; SOILS ; DUST
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	兰州大学 ; 中国科学院青藏高原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326520
作者单位	[Taheri, Mehdi; Khormali, Farhad] Gorgan Univ Agr Sci & Nat Resources, Dept Soil Sci, Fac Water & Soil Engn, Gorgan, Golestan, Iran; [Wang, Xin; Wei, Haitao; Chen, Fahu] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China; [Amini, Arash] Golestan Univ, Fac Sci, Dept Geol, Gorgan, Golestan, Iran; [Landi, Ahmad] Shahid Chamran Univ Ahvaz, Soil Sci Dept, Fac Agr, Ahwaz, Iran; [Kehl, Martin] Univ Cologne, Inst Geog, Albertus Magnus Pl, D-50923 Cologne, Germany; [Chen, Fahu] Chinese Acad Sci, Key Lab Alpine Ecol, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; [Chen, Fahu] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Taheri, Mehdi,Khormali, Farhad,Wang, Xin,et al. Clay mineralogy and geochemistry of the Lower Pleistocene Loess in the Iranian Loess Plateau (Agh Band section) and implications for its provenance and paleoclimate change[J]. 兰州大学, 中国科学院青藏高原研究所,2020,552:91-99.
APA	Taheri, Mehdi.,Khormali, Farhad.,Wang, Xin.,Amini, Arash.,Landi, Ahmad.,...&Chen, Fahu.(2020).Clay mineralogy and geochemistry of the Lower Pleistocene Loess in the Iranian Loess Plateau (Agh Band section) and implications for its provenance and paleoclimate change.QUATERNARY INTERNATIONAL,552,91-99.
MLA	Taheri, Mehdi,et al."Clay mineralogy and geochemistry of the Lower Pleistocene Loess in the Iranian Loess Plateau (Agh Band section) and implications for its provenance and paleoclimate change".QUATERNARY INTERNATIONAL 552(2020):91-99.