220 ka BP来大同盆地常量元素记录的气候变化

doi:10.7522/j.issn.1000-694X.2017.00104

摘要/Abstract

摘要： 大同盆地第四纪以来发育了厚层的河湖相，上覆马兰黄土或全新统，蕴含着丰富的过去气候变化信息。以地层测年数据建立年代框架，结合地层磁化率、粒度测试资料，主要以常量化学元素为气候代用指标，对气候变化进行分析。结果表明：（1）地层沉积物中常量化学元素含量的平均值SiO₂ > Al₂O₃ > CaO > Na₂O > Fe₂O₃ > K₂O > MgO，沉积相不同元素含量存在明显差异，反映出元素聚集时气候环境存在差异。（2）220 ka BP以来大同盆地气候变化经历了中更新世220~199 ka BP暖湿期、中更新世199~138 ka BP干燥寒冷期、末次间冰期138~71 ka BP温暖湿润期、末次冰期71~11 ka BP寒冷干燥期、全新世11 ka BP至今的暖湿冷干交替频繁波动期，在每个时段仍存在次一级的气候波动。（3）这种气候变化过程与纬度位置大体相近的中国北方萨拉乌苏河流域、内蒙古岱海地区有着相似的气候变化过程，反映出本区气候变化是全球气候变化所导致的东亚冬夏季风势力互为消长的区域响应。

关键词: 常量化学元素, 气候变化, 大同盆地

Abstract: The Datong Basin developed thick fluvio-lacustrine sediments in Quaternary period and aeolian loess overlied, which recorded an abundant information on past climatic and environmental changes. To analyze the climate changes, we mainly use the primary oxides as climate proxies to establish the age framework according to stratigraphic dating data, combining formation susceptibility and particle size. The results showed that:(1)The average content of chemical elements of the sediments in the constant formation was SiO₂ > Al₂O₃ > CaO > Na₂O > TOFE > K₂O > MgO from high to low,the sedimentary facies of different elements are obviously different, reflecting elements vary with climate change. (2) The Datong Basin climate change experienced the following 5 stages:The research area climate was warm-humid during the Middle Pleistocene of 220-199 ka BP, and cold-dry climate occurrenced during the Middle Pleistocene of 199-138 ka BP, and warm-humid climate occurrenced during the last interglacial period of 138-71 ka BP, and cold-dry climate was showed during the last glacial stage of 71-11 ka BP, and the Holocene periodclimate was alternate variationsof warm-wet and cold-dry. However, during each period there is still less-grade climate fluctuation level. (3) These climatic changes is similar with Salawusu River and Inner Mongolia Daihai region roughly in the same latitude, and are well accordant with the global climatic change reflected by the deep-sea oxygen isotope and the polar ice core, showing a consistency in time of climatic change between the study area and the global. The climate change in this area is regional response of global climate change influenced by the East Asian winter and summer monsoon.

Key words: main chemical element, climatic change, Datong Basin

中图分类号:

P531

柳苗苗, 苏志珠, 孔梦园, 张彩霞, 李晋昌, 王国玲, 李想. 220 ka BP来大同盆地常量元素记录的气候变化[J]. 中国沙漠, 2018, 38(2): 278-285.

Liu Miaomiao, Su Zhizhu, Kong Mengyuan, Zhang Caixia, Li Jinchang, Wang Guoling, Li Xiang. Climatic Change Reflected by Geochemical Features in Datong Basin, North China since 220 ka BP[J]. Journal of Desert Research, 2018, 38(2): 278-285.

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