Chemical weathering since the little ice age recorded in lake sediments: A high-resolution proxy of past climate

被引:99
作者
Jin, ZD [1 ]
Wang, SM
Shen, J
Zhang, EL
Li, FC
Ji, JF
Lu, XW
机构
[1] Chinese Acad Sci, Lake Sediment & Environm Lab, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China
[2] Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China
[3] Chinese Acad Sci, Inst Geog, Beijing 100101, Peoples R China
关键词
closed lake; Rb/Sr ratio; chemical weathering; the Little Ice Age;
D O I
10.1002/esp.224
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
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 CaCO3, 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 CaCO3 concentrations with delta O-18 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 (C) 2001 John Wiley & Sons, Ltd.
引用
收藏
页码:775 / 782
页数:8
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