Sedimentary characteristics of the Early and Middle Holocene loess in Tongchuan area and their implications for paleoclimate

ZHOU Jiaxing; YU Juan; YANG Lijun; WU Lijie

doi:10.16562/j.cnki.0256-1492.2018091901

2020 Vol. 40, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2020 > 40(1): 160-166

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ZHOU Jiaxing, YU Juan, YANG Lijun, WU Lijie. Sedimentary characteristics of the Early and Middle Holocene loess in Tongchuan area and their implications for paleoclimate[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 160-166. doi: 10.16562/j.cnki.0256-1492.2018091901

Citation:

ZHOU Jiaxing, YU Juan, YANG Lijun, WU Lijie. Sedimentary characteristics of the Early and Middle Holocene loess in Tongchuan area and their implications for paleoclimate[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 160-166. doi: 10.16562/j.cnki.0256-1492.2018091901

Sedimentary characteristics of the Early and Middle Holocene loess in Tongchuan area and their implications for paleoclimate

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
2.
The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuan 050061, China
3.
School of Environment Studies, China University of Geosciences, Wuhan 430074, China

More Information

Corresponding author: YU Juan, 48833488@qq.com

Received Date: 19 September 2018

Revised Date: 19 December 2018

Publish Date: 25 February 2020

Abstract

Abstract

The grain size of the loess and palaeosol in the Tongchuan section was studied as the main subject of this paper. Combining the magnetic susceptibility data, we analyzed the paleoclimate changes during the period from 11.4 to 1.5 kaBP. It is revealed that: (1) The loess-palaeosol deposits in the profile of Tongchuan are silt dominated (69.78%) over clay (28.35%) and sand (1.87%). (2) Silt and sand are higher in loess but lower in paleosol, while the values of clay particles and magnetization were lower in loess but higher in paleosol layers. (3) The variation trend of the clay (＜4 μm), silt (4～63 μm) and magnetic susceptibility index have good correspondence to the loess-palaeosol alternation and the cold and dry climatic events between 11.4～1.5 kaBP. Based upon it the climate change in this area can be divided into four stages. In the period of 11.4～10.2 kaBP, the climate was very dry and cold; in the period of 10.2～9.1 kaBP, temperature gradually increased, and the climate was slightly warm and dry; during the period of 9.1～4.4 kaBP, the climate was warm and humid; while in the period of 4.4～1.5 kaBP, climate gradually turned to cold and dry.
- grain size /
- magnetic susceptibility /
- climate change /
- Early-Middle Holocene /
- Tongchuan

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References

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