Composition Characteristics and Significance of Rb, Sr and Ba of Fanjiacheng Loess-paleosol Profile in the Upper Reaches of the Weihe River

doi:10.7522/j.issn.1000-694X.2018.00160

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (6): 90-98.DOI: 10.7522/j.issn.1000-694X.2018.00160

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Composition Characteristics and Significance of Rb, Sr and Ba of Fanjiacheng Loess-paleosol Profile in the Upper Reaches of the Weihe River

Lei Chen, Pang Jiangli, Huang Chunchang, Zha Xiaochun, Zhou Yali, Wen Ruiyan, Chui Yuda

School of Geography and Tourism/National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an 710119, China

Received:2018-10-21 Revised:2018-12-26 Published:2019-11-14

Abstract

Abstract: The Holocene loess-paleosol profile of Fanjiacheng in the upper Weihe River was selected as the research object, and the contents of Rb, Sr, Ba, magnetic susceptibility, grain size and CaCO₃ in the profile were measured. The results show that Rb, Sr, Ba and Rb/Sr ratio, Ba/Sr ratio are significantly correlated with magnetic susceptibility, particle size and CaCO₃, which can indicate the Holocene climate change in the upper Weihe River. The magnetic susceptibility, clay, Rb/Sr, Ba/Sr ratio and elements Rb and Ba in the paleosol layer in the profile are higher than those in the loess layer, while the contents of CaCO₃ and Sr are lower than those in the loess layer, suggesting that the paleosol layer (S₀) in the upper Weihe River was mainly affected by summer monsoon, with a warm and humid climate, and it further indicated the leaching degree, weathering and pedogenesis were strong. The formation period of loess layer was mainly affected by winter monsoon, with a relatively cold and dry climate, and it further indicated the leaching degree, weathering and pedogenesis were weak. The loess interlayer between the paleosol layers S₀¹ and S₀² reflected the significant deterioration of climate in the upper Weihe River during the period of 6 000-5 000 a BP in the mid-Holocene.

Key words: loess-paleosol, Rb/Sr ratio, Ba/Sr ratio, Holocene, climate change, upper Weihe River

CLC Number:

P531

Lei Chen, Pang Jiangli, Huang Chunchang, Zha Xiaochun, Zhou Yali, Wen Ruiyan, Chui Yuda. Composition Characteristics and Significance of Rb, Sr and Ba of Fanjiacheng Loess-paleosol Profile in the Upper Reaches of the Weihe River[J]. Journal of Desert Research, 2019, 39(6): 90-98.

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Composition Characteristics and Significance of Rb, Sr and Ba of Fanjiacheng Loess-paleosol Profile in the Upper Reaches of the Weihe River

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