vertical zonality,overlying deposit,environmental change; Shiyang River Basin ,"/> 石羊河流域表层沉积物垂直地带性分异特征———基于粒度与矿物指标

干旱区研究 ›› 2019, Vol. 36 ›› Issue (6): 1550-1558.

• 陆面过程 • 上一篇    下一篇

石羊河流域表层沉积物垂直地带性分异特征———基于粒度与矿物指标

韩琴,李育 ,李鹏程   

  1. 兰州大学 资源环境学院,甘肃 兰州 730000
  • 收稿日期:2019-01-05 修回日期:2019-06-01 出版日期:2019-11-15 发布日期:2019-11-22
  • 通讯作者: 李育
  • 作者简介:韩琴(1993-),女,博士研究生,研究方向为气候变化与水循环. E-mail:hanqin92@163.com
  • 基金资助:
    国家自然科学基金项目(41822708, 41571178); 中国科学院战略性先导科技专项(XDA20100102); 兰州大学中央高校基本科研业务费专项(lzujbky-2018-k15); 第二次青藏高原综合科学考察研究项目(XDA20060700)资助

Vertical Zonality of Overlying Deposits in the Shiyang River Basin: Based on Granularity and Mineral Indicators

HAN Qin, LI Yu, LI Peng-cheng   

  1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000,Gansu China
  • Received:2019-01-05 Revised:2019-06-01 Online:2019-11-15 Published:2019-11-22

摘要:

地域分异规律是自然地理学非常重要的基本理论。在气候重建中,只考虑纬度地带性会使重建结果产生较大的误差。通过对石羊河流域现代表层沉积物粒度与矿物指标的垂直地带分布特征分析,结合流域全新世沉积剖面的粒度与矿物数据,对比石羊河流域的现代表层沉积物与全新世沉积物粒度和矿物特征,进而探索石羊河流域环境变化及其驱动机制。结果表明:全新世与现代具有相同的驱动力,石羊河流域上游在亚洲冬季风与西风的影响下,呈现山前风成沉积特征;中游地区在河湖水动力的影响下,呈现冲积、洪积特征;石羊河流域下游终端湖区,呈现湖相沉积特征,且现代气候较全新世时期更为干旱。

关键词: 垂直地带性, 表层沉积物, 环境变化, 石羊河流域

Abstract: Regional differentiation is an important and basic theory of physical geography. A big mistake may be made in reconstructing paleoclimate if the latitudinal zonality is considered only. In this study, the Shiyang River Basin in Gansu Province was selected as the study area to reveal the environmental change and its driving factors by analyzing the grain size data and mineral data of overlying deposits in the drainage basin. Lithology, grain size and mineral indicators were included in this study. In addition to the overlying deposits, the grain size and mineral data along the Holocene sedimentary profiles in the Shiyang River Basin were collected for comparing with those of overlying deposits. The results showed that: ① Driving forces of both Holocene and modern overlying deposits in the Shiyang River Basin were similar, and the piedmont Aeolian deposit was formed under the Asian winter wind and west wind in the upper reaches; ②Alluvial and proluvial deposits were formed under the fluvial and eulimnetic joint effect in the middle reaches; ③ Lacustrine deposit formed in the terminal-lake areas, and drought is currently more serious than that in the Holocene.

Key words: vertical zonality')">

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