img

官方微信

高级检索

中国沙漠 ›› 2025, Vol. 45 ›› Issue (2): 111-118.DOI: 10.7522/j.issn.1000-694X.2024.00162

• • 上一篇    

若尔盖盆地阿米欧拉-南剖面粒度端元特征及其记录的15 ka来气候变化

翟颖1(), 庞奖励1(), 黄春长1, 查小春1, 周亚利1, 李瑜琴1, 张玉柱2, 孙雪晴1, 赵晓康1   

  1. 1.陕西师范大学 地理科学与旅游学院,陕西 西安 710119
    2.西北大学 城市与环境学院,陕西 西安 710127
  • 收稿日期:2024-10-24 修回日期:2024-11-18 出版日期:2025-03-20 发布日期:2025-03-26
  • 通讯作者: 庞奖励
  • 作者简介:翟颖(1998—),女,四川遂宁人,硕士研究生,主要研究方向为第四纪环境演变。E-mail: 1654702911@qq.com
  • 基金资助:
    国家自然科学基金项目(42271046)

Particle endmembers characteristics of Amiola-South profile in the Zoige Basin and recorded climate change since 15 ka BP

Ying Zhai1(), Jiangli Pang1(), Chunchang Huang1, Xiaochun Zha1, Yali Zhou1, Yuqin Li1, Yuzhu Zhang2, Xueqing Sun1, Xiaokang Zhao1   

  1. 1.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
    2.School of Urban and Environment Sciences,Northwest University,Xi'an 710127,China
  • Received:2024-10-24 Revised:2024-11-18 Online:2025-03-20 Published:2025-03-26
  • Contact: Jiangli Pang

摘要:

选取玛曲县阿米欧拉-南剖面黄土-古土壤序列,对其粒度进行端元分析,结合磁化率和Rb/Sr,试图揭示典型剖面沉积物的沉积学和动力学特征及其与气候演变的关系。结果表明:(1)粒度可划为5个端元组分,EM1为悬移搬运的细颗粒物质及成壤作用产生的黏粒;EM2为气候暖湿时风力对河漫滩物质的搬运作用;EM3是西风和东亚冬季风搬运的砂粒;EM4是强沙尘暴或强冬季风从近源地区搬运的粗颗粒物质;EM5是若尔盖古湖泊的湖滨环境。(2)在阿米欧拉山一带,由于若尔盖古湖湖水退却,在15.5 ka BP前后出露陆地并开始接受稳定的风尘堆积,15.5~8.5 ka BP寒冷干燥,8.5~3.0 ka BP转为温暖湿润,3.0 ka BP至今转为干冷。小波分析表明东亚季风有5.6 ka的主周期和2.1 ka、3.5 ka的次周期旋回。

关键词: 阿米欧拉-南剖面, 湖滨, 风积物, 粒度端元, 气候变化

Abstract:

In this study, we selected the loess-paleosoil sequence from Amiola-South profile in Maqu County to analyze its grain size, and combined with magnetic susceptibility and Rb/Sr, in an attempt to reveal the sedimentological and kinetic characteristics of typical profile sediments and their relationship with climate evolution. The results showed that: (1) The particle size was divided into five terminal components: EM1 is the fine particulate matter transported by suspension and the clay particles produced by soil formation; EM2 is the effect of wind on the transport of floodplain materials in warm and humid climates. EM3 is the sand carried by the westerly and East Asian winter winds; EM4 is coarse particulate matter transported from near-source areas by severe sandstorms or strong winter winds; and EM5 is the lakeside setting of the ancient Zoige lake. (2) In the area of Amiola Mountain, due to the retreat of the water of the ancient Zoige lake, the land was exposed around 15.5 ka BP and began to accept stable wind and dust accumulation, 15.5-8.5 ka BP was cold and dry, 8.5-3.0 ka BP turned warm and wet, and 3.0 ka BP turned dry and cold so far. Wavelet analysis shows that the East Asian monsoon has a main cycle of 5.6 ka and a sub-cycle cycle of 2.1 ka and 3.5 ka.

Key words: Amiola-South profile, lakeside, aeolian deposits, particle endmembers, climate change

中图分类号: