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

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

2019 , Vol. 39 >Issue 6: 90 - 98

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

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

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

Received date: 2018-10-21

Revised date: 2018-12-26

Online published: 2019-11-14

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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

Cite this article

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

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