Weak chemical weathering during the Little Ice Age recorded by lake sediments |
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| Authors: | JIN Zhangdong WANG Sumin SHEN Ji ZHANG Enlou JI Junfeng LI Fuchun |
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| Institution: | 1. Lake Sediment and Environment Laboratory, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2. Department of Earth Sciences, Nanjing University, Nanjing 210093, China |
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| Abstract: | Low magnetic susceptibility, low Sr content and hence high Rb/Sr ratio in the lake sediment sequence indicate a weak chemical
weathering process under arid and cold climate of the Little Ice Age in a single closed lake watershed. According to different
geochemical behavior between rubidium and strontium in earth surface processes, variation of Rb/Sr ratios in the lake sediment
sequence can be used as an effective geochemical proxy with definite climatic significance of chemical weathering in watershed.
Unlike chemical weathering process in tropic zone and modern temperate-humid climate, concordant changes in both Sr content
and magnetic susceptibility with δ18O values of Dunde ice core suggest that the weak chemical weathering was controlled by air temperature during the Little Ice
Age maximum. After the Little Ice Age, chemical weathering intensity was controlled also gradually by precipitation with increasing
in temperature. |
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| Keywords: | closed lake Rb/Sr ratio chemical weathering the Little Ice Age |
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