Geochemical characteristics of the Miocene eolian deposits in China: Their provenance and climate implications

doi:10.1029/2008GC002331

	Geochemical characteristics of the Miocene eolian deposits in China: Their provenance and climate implications
	Liang, Meiyan 1; Guo, Zhengtang 1; Kahmann, A. Julia 2; Oldfield, Frank 3
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2009-04-02
卷号	10
关键词	geochemistry Miocene loess-soil sequence paleoclimate Asian monsoon
ISSN号	1525-2027
DOI	10.1029/2008GC002331
文献子类	Article
英文摘要	In the Loess Plateau in northern China, the Quaternary loess-soil sequences, the Hipparion Red Earth of eolian origin (Red Clay), and the Miocene loess-soil sequences constitute a near-continuous terrestrial record of paleoclimates for the past 22 Ma. In this study, Miocene loess and paleosol samples from Qinan (QA-I) were analyzed for their major, trace, and rare earth element chemistry and compared with the Plio-Pleistocene samples from Xifeng with emphasis on their provenance and paleoclimatic implications. The results show similar geochemical signatures for the eolian deposits of different ages, and they are also comparable to the average composition of the upper continental crust. These suggest that the dust materials were all derived from well-mixed sedimentary protoliths which had undergone numerous upper crustal recycling processes. They also support the notion of broadly similar source areas and dust-transporting trajectories for different periods since the early Neogene. The slightly higher K2O, Fe2O3, and MgO concentrations and loss on ignition values and the lower Na2O content in the Miocene loess samples compared to their Quaternary counterparts are attributable to the finer grain size of the Miocene loess associated with weaker dust-carrying winds. In comparison with some loess in Europe and America with less extensive sources, eolian deposits from northern China show higher Cs and lower Zr and Hf content. This is attributable to the sorting processes from remoter sources during transportation and could be regarded as an indication of the desert origin of the loess deposits. Miocene paleosol samples show higher chemical index of alteration values and lower CaO, MgO, and Na2O concentrations than does the intervening loess, indicating stronger weathering of the paleosols. However, the moderate chemical weathering of the paleosol samples indicates a constant semiarid and subhumid climatic range in northern China since the early Miocene.
WOS关键词	LOESS-PALEOSOL SEQUENCE ; RARE-EARTH ELEMENTS ; RED CLAY FORMATION ; WIND-BLOWN ORIGIN ; ASIAN MONSOON ; GRAIN-SIZE ; SEDIMENTARY-ROCKS ; NORTHERN CHINA ; SOIL SEQUENCE ; PLATEAU
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000264859300001
资助机构	Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40730104) ; National Natural Science Foundation of China(40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40730104) ; National Natural Science Foundation of China(40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40730104) ; National Natural Science Foundation of China(40730104) ; Chinese Academy of Sciences(KZCX2-YW-117) ; Chinese Academy of Sciences(KZCX2-YW-117) ; National Natural Science Foundation of China(40730104) ; National Natural Science Foundation of China(40730104)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71066]
专题	中国科学院地质与地球物理研究所
通讯作者	Guo, Zhengtang
作者单位	1.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Baylor Univ, Dept Geol, Waco, TX 76798 USA 3.Univ Liverpool, Dept Geog, Liverpool L69 7ZT, Merseyside, England
推荐引用方式 GB/T 7714	Liang, Meiyan,Guo, Zhengtang,Kahmann, A. Julia,et al. Geochemical characteristics of the Miocene eolian deposits in China: Their provenance and climate implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2009,10.
APA	Liang, Meiyan,Guo, Zhengtang,Kahmann, A. Julia,&Oldfield, Frank.(2009).Geochemical characteristics of the Miocene eolian deposits in China: Their provenance and climate implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,10.
MLA	Liang, Meiyan,et al."Geochemical characteristics of the Miocene eolian deposits in China: Their provenance and climate implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 10(2009).