Chemical weathering since the Little Ice Age recorded in lake sediments: a high-resolution proxy of past climate
✍ Scribed by Zhangdong Jin; Sumin Wang; Ji Shen; Enlou Zhang; Fuchun Li; Junfeng Ji; Xinwei Lu
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 116 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0360-1269
- DOI
- 10.1002/esp.224
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✦ Synopsis
Abstract
Because of the different geochemical behaviour of rubidium and strontium in earth surface processes, variations of the Rb/Sr ratios in lake sediments were used as a geochemical proxy of chemical weathering and past climate in a single watershed. Low magnetic susceptibility, low CaCO~3~, low Sr concentration and, hence, high Rb/Sr ratio in the lake sediments indicate weak chemical weathering under a cold but wet climate during the Little Ice Age (LIA) in the closed Daihai Lake watershed. The concordant change in both Sr and CaCO~3~ concentrations with δ^18^O values in the Dunde ice core suggests that weak chemical weathering during the wet LIA was controlled by air temperature. After the LIA, however, precipitation played a dominant role in chemical weathering. Copyright © 2001 John Wiley & Sons, Ltd.