陈海涛^1,2,,
孔凡彪^2,3,
徐树建^1,2,,,
苗晓东²
1. 山东科技大学地球科学与工程学院, 山东 青岛 266590
2. 山东省水土保持与环境保育重点实验室, 临沂大学资源环境学院, 山东 临沂 276000
3. 山东师范大学地理与环境学院, 山东 济南 250014

基金项目: 国家自然科学基金项目(批准号: 41977262和41472159)和中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所)开放基金项目(批准号: 2018KFJJ08)共同资助


详细信息

作者简介: 陈海涛, 男, 25岁, 硕士研究生, 第四纪地质与环境研究, E-mail: chenhaitao0329@163.com

通讯作者: 徐树建, E-mail: xushujian1967@163.com

中图分类号: P534.63⁺1

收稿日期:2020-10-28
修回日期:2021-02-10
刊出日期:2021-09-30

Dust accumulation process indicated by grain size end-members of the coastal loess since the Late Pleistocene in Miaodao Islands of Shandong Province

CHEN Haitao^1,2,,
KONG Fanbiao^2,3,
XU Shujian^1,2,,,
MIAO Xiaodong²
1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong
2. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, School of Resources and Environment, Linyi University, Linyi 276000, Shandong
3. School of Geography and Environment, Shandong Normal University, Jinan 250014, Shandong


More Information

Corresponding author: XU Shujian,E-mail:xushujian1967@163.com

MSC: P534.63⁺1

--> Received Date: 28 October 2020
Revised Date: 10 February 2021
Publish Date: 30 September 2021


摘要
摘要:山东黄土作为东亚风尘沉积系统的重要组成部分，蕴含中国东部沿海地区古气候及古环境的演变信息，在中国古环境变化研究中具有重要地位。文章通过对庙岛群岛砣矶岛大口北剖面（TJII）690 cm出露部分的粒度数据进行参数化端元分析，探讨了该剖面黄土粉尘的搬运与堆积过程，并结合环境敏感组分的小波分析，提取了该区夏季风与冬季风在年代尺度上的周期变化特征。结果表明，TJII剖面的粉尘搬运与堆积是季风演变过程中高空西风、低空地方风系以及近地气流综合作用的结果，并同时受到海平面升降的影响；虽然TJII剖面中含有高空西风远距离搬运并以湿沉降方式堆积的粉尘物质，但低海平面时出露的大陆架松散沉积物为该剖面的主要粉尘来源，并在尘暴发生时通过短距离的搬运后发生堆积；与此同时，因尘暴发生频率的增加和强地表风对该剖面中浮尘颗粒沉降的阻碍或使其重新卷入大气中形成二次搬运而影响着细粉砂组分在剖面中的含量；进一步对环境敏感端元组分进行小波分析的结果表明，该区的夏季风在0.6 ka、1.4 ka、2.2 ka和5.7 ka尺度上存在着周期旋回特征，其中以5.7 ka为夏季风变化的主周期并与该剖面古土壤的发育存在较为密切联系；而冬季风在0.6 ka、1.6 ka、2.6 ka、3.6 ka和5.5 ka尺度上存在着周期旋回特征，并以5.5 ka为冬季风变化的主周期，初步体现出粒度端元分析和小波变化分析方法在研究山东黄土沉积动力环境和物源特征方面具有较好的适用性。
关键词: 滨海黄土/
晚更新世/
粉尘堆积/
端元分析/
庙岛群岛

Abstract:The loess of Shandong Province is distributed in the transition zone between land and sea, as the eastern edge of Chinese loess. It is the important component of the East Asian eolian deposition system and records the paleoclimatic and environmental changes in the monsoon region. Based on previous related research, we investigated the the Dakoubei loess section(TJII: 38°10'32″N, 120°44'45″E) located at Tuoji Islands, which was formed by the accumulation of aeolian loess. A parameterized end-member analysis of the particle size data from this loess profile of 690 cm since the Late Pleistocene was performed, and wavelet analysis was used to extract the periodic variation characteristics of the monsoon in the area. The results of the parameterized end-member analysis of the granularity data showed the grain size components were divided into 4 end-members: EM1 represents the clay component transported by the high-level westerly wind from long distance, EM2 represents the sedimentation component in the form of floating silt, EM3 represents the silt component transported in low altitude suspension by the local wind system, and EM4 represents the sand component transported by near-surface saltation in the form of a dust storm. The transportation and accumulation of loess dust in TJII is a complex process of monsoon evolution from source to sink, which was the result of the combined effects of high-altitude westerly wind, low-altitude local wind system and near-surface airflow during the monsoon evolution and affected by the rise and fall of sea level. The wavelet analysis results further showed the different periodic characteristics. The summer monsoon showed cyclicities of 0.6 ka, 1.4 ka, 2.2 ka, and 5.7 ka, of which 5.7 ka is the main cycle; the winter monsoon showed cyclicity of 0.6 ka, 1.6 ka, 2.6 ka, 3.6 ka, and 5.5 ka, and 5.5 ka is the main cycle. In general, the grain size end-member analysis and wavelet analysis had good applicability on investigation of the dynamic environment and provenance characteristics of Shandong loess deposits. The application of these two methods can provide the foundation for quantitatively estimating the contribution of the proximal and distal materials of eolian dust accumulation in Shandong, and also provide a reference for the study of the pattern and evolution of the paleo-atmospheric circulation in East Asia.
Key words:coastal loess/
Late Pleistocene/
dust accumulation/
end-member analysis/
Miaodao Islands



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=fa1da21b-13ea-48a7-a2c2-8e8c7819b06b