Carbonate verse silicate Sr isotope in lake sediments and its response to Little Ice Age

被引：18

作者：

Jin, ZD ^{[1
]}

Wang, SM

Shen, J

Wang, YX

机构：

[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Lake Sedimentat & Environm, Nanjing 210008, Peoples R China

[2] Nanjing Univ, State Key Lab Res Mineral Deposits, Nanjing 210093, Peoples R China

[3] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2003年 / 48卷 / 01期

基金：

中国国家自然科学基金;

关键词：

chemical weathering; Sr isotope; inland lake; Little Ice Age;

D O I：

10.1360/03tb9020

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The Sr-87/Sr-86 ratios of silicate (acid-insoluble, AI) and carbonate (acid-soluble, AS) of the lake sediments from the Daihai Lake, Inner Mongolia, since the last 500 years are measured respectively, indicating that chemical weathering of silicate minerals was in an early stage since the Little Ice Age within the Daihai watershed by combination with mineral constitute, Rb/Sr ratio and CaCO3 content in the sediments. During the Little Ice Age maximum, an evident peak in the Sr-87/Sr-86 ratios of both silicate and carbonate in sediments suggests that a cold climate condition is unfavorable to dissolving radiogenic strontium from silicate minerals. Meanwhile, the variation of Sr-87/Sr-86 ratios of silicate and carbonate also reflects a projected warming climate favorable to intensifying chemical weathering after the Little Ice Age. Consequently, the Sr-87/Sr-86 ratio of both silicate and carbonate in inland lake sediments can be used as an effective proxy of the past climate in single watershed.

引用

页码：95 / 100

页数：6

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