Mineralogy and carbonate geochemistry of the Dali Lake sediments: Implications for paleohydrological changes in the East Asian summer monsoon margin during the Holocene

被引:23
|
作者
Fan, Jiawei [1 ,2 ]
Xiao, Jule [1 ,2 ,3 ]
Wen, Ruilin [1 ,2 ]
Zhang, Shengrui [1 ,2 ]
Huang, Yun [1 ,2 ]
Yue, Jiaojiao [1 ,2 ]
Wang, Xu [1 ,2 ]
Cui, Linlin [1 ,2 ]
Li, He [4 ]
Xue, Dingshuai [4 ]
Liu, Yanhong [4 ]
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
[3] Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
[4] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Dali lake; Mineralogy; Carbonate geochemistry; Paleohydrological change; East asian summer monsoon; Holocene; OXYGEN-ISOTOPE RECORD; HIGH-RESOLUTION; CHINESE LOESS; DELTA O-18; BASIN; CAVE; QINGHAI; PALEOLIMNOLOGY; DEGLACIATION; HYDROCLIMATE;
D O I
10.1016/j.quaint.2018.03.019
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Hydrological variations in individual plateau lakes respond from both local hydrological processes and regional climatic changes. This study presents high resolution, absolutely-dated records of minerals in bulk samples and elements and stable isotopes of endogenic calcites from a sediment core from Dali Lake in Inner Mongolian Plateau, aiming to investigate the patterns and mechanisms of Holocene hydrological and climatic changes in the modern northern margin of the East Asian summer monsoon (EASM). Increases in the percentages of allogenic minerals (quartz, microcline and albite) and decreases in the percentages of endogenic/authigenic minerals (calcite, Mg-calcite and gypsum), together with decreases in the values of Ca and Mg concentrations and delta O-18 and delta C-13 of endogenic calcites indicate an excess of water input to the lake over evaporative losses, and vice versa. These data suggest that the hydrological balance of Dali Lake was controlled by strong evaporation before 9800 cal yr BP, and then the lake was supplied by significantly increased inflowing water between 9800 and 5900 cal yr BR. From 5900 to 4850 cal yr BP, the water input to the lake significantly decreased. Since 4850 cal yr BP, the inflowing water maintained a low level. In addition, the distinct characteristics of mineralogy and carbonate geochemistry of the Dali Lake sediments during the periods of high lake level between 9800-7700 and 7700-5900 cal yr BP imply that the lake was mainly fed by snow/ice melt water in the former period and then by regional precipitation in the latter period, which was further supported by the pollen records from the same sediment core. These results suggest that Holocene hydrological variations in the EASM margin were closely related to changes in regional temperature and precipitation which were ultimately controlled by changes in the Northern Hemisphere summer insolation, northern high latitude ice sheets, global sea level and physicochemical conditions of the North Atlantic and western tropical Pacific on orbital and millennial timescales. The datasets in this study support that the maximum EASM intensity occurred during the middle Holocene in the northern EASM regions. (C) 2018 Elsevier Ltd and INQUA. All rights reserved.
引用
收藏
页码:103 / 112
页数:10
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