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标题

萨拉乌苏河流域全新世气候变化的元素地球化学记录

作者

陈 璐 鲁瑞洁 刘小槺 贾飞飞 李腾飞 杜 婧

机构

北京师范大学地表过程与资源生态国家重点实验室; 北京师范大学地理学院; 北京师范大学地理科学学部; 辽宁师范大学城市与环境学院

摘要

通过对萨拉乌苏河流域滴哨沟湾左岸沉积剖面常量元素Si、Al、Fe、Ca、Mg、K、Na含量及其比值变化的分 析,结合14C测年结果及粒度、有机质指标,并综合已有研究,探讨了该地区全新世以来的气候变化.研究表明,9.6kaBP 前气候干冷,沉积相为风成沉积;9.6~>8.4kaBP气候由干冷向暖湿转变,期间存在干冷波动;8.4~>4.0kaBP进入 全新世大暖期,其中,8.4~>6.5kaBP为全新世大暖期的鼎盛时期,降水增加,积水成湖,湖泊水位高且稳定;6.5ka BP 气候发生明显转变;6.5~>4.0kaBP湖泊水位逐步下降形成富含螺壳的浅水环境,但气候整体仍较为湿润;4.0~ >1.2kaBP气候变干冷,发育沼泽;1.2~>0.7kaBP气候转暖湿,沉积相由沼泽相转变为湖泊相;0.7~0.5kaBP为 河流相沉积,气候较为干冷.剖面记录的气候变化可与东亚季风变化、温度变化、太阳辐射进行对比,反映了该区域气候 变化与全球气候变化的一致性.

关键词

萨拉乌苏河; 全新世; 元素地球化学; 气候变化

引用

陈 璐 鲁瑞洁 刘小槺 贾飞飞 李腾飞 杜 婧萨. 拉乌苏河流域全新世气候变化的元素地球化学记录.[J]. 北京师范大学学报(自然科学版),2017,53(3): 308-315.

基金

国家自然科学基金资助项目(41330748); 北京高等学校青年英才计划资助项目(YETP0261)

分类号

P532

DOI

10.16360/j.cnki.jbnuns.2017.03.011

Title

Holocene climate changes recorded by elemental geochemistry in the Salawusu River Region

Author

CHEN Lu LU Ruijie LIU Xiaokang JIA Feifei LI Tengfei DU Jing

Affiliations

State Key Laboratory of Earth Surface Process and Resource Ecology, Beijing Normal University; College of Geography, Beijing Normal University; Faculty of Geography Sciences, Beijing Normal University; College of Urban and Environmental Science, Liaoning Normal University

Abstract

The Dishaogouwan strati graphic section of the Salawusu River valley is located at the southeastern margin of the Mu Us Desert on the Ordos Plateau of Inner Mongolia, which is the transition zone between the Mu Us Desert and the Loess Plateau and is sensitive to global climate changes. This is an ideal region to study global climate changes. Constant elements such as Si, Al, Fe, Ca, Mg, K, Na and their ratio changes in DSGL section in the Salawusu River region were analzyed, 14C dating combined with elemental geochemistry proxies indicated that before 9.6 ka BP, the climate was dry and cold, with strong wind-sand activities. From 9.6 ~> 8.4 ka BP, the climate became warm and wet with dry-cold fluctuation. Holocene Climate Optimum period took place from 8.4 ~> 4.0 ka BP, and 8.4 ~>6.5 ka BP was the Mega thermal Maximum, i.e. , the maximum lake period. From 6.5 ~> 4.0 ka BP, the climate also continued to be wet with the lake started to become smaller. From 4.0 ~> 1.2 ka BP interval, the climate turned to be dry and cold, developed swamps. A relatively warmer period occurred in 1.2 ~> 0.7 ka BP interval. From 0.7 ~ 0.5 ka BP, the climate turned to be dry and cold again and the river was formed. The record in the profile can be compared with the cold events in the north Atlantic, δ18O record from Dongge Cave, average solar radiation, reflecting the consistency of the regional climate change and global climate change.

Key words

Salawusu River; Holocene; elemental geochemistry; climate change

cite

CHEN Lu LU Ruijie LIU Xiaokang JIA Feifei LI Tengfei DU Jing. Holocene climate changes recorded by elemental geochemistry in the Salawusu River Region [J]. Journal of Beijing Normal University (Natural Science), 2017,53(7): 308-315.

DOI

10.16360/j.cnki.jbnuns.2017.03.011

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
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