地理科学进展 ›› 2011, Vol. 30 ›› Issue (3): 379-384.doi: 10.11820/dlkxjz.2011.03.017

• 生态环境 • 上一篇    

甜水沟全新世黄土-古土壤序列风化程度及意义

王丽娟, 庞奖励, 黄春长, 丁敏, 牛晓露, 李艳华   

  1. 陕西师范大学旅游与环境学院,西安710062
  • 收稿日期:2010-03-01 修回日期:2010-07-01 出版日期:2011-03-25 发布日期:2011-03-25
  • 通讯作者: 庞奖励(1963-),男,陕西西安人,教授,博士生导师,主要从事土地利用与土壤演变的研究。E-mail:jlpang@snnu.edu.cn E-mail:jlpang@snnu.edu.cn
  • 作者简介:王丽娟(1986-),女,四川乐山人,硕士研究生,研究方向是土地资源开发与环境演变。E-mail: wanglijuan-222@163.com
  • 基金资助:

    国家自然基金重点项目(41030637);中央高校基本科研业务费专项基金项目(GK200901007)。

Weathering Intensity of the TSG Holocene Loess-paleosol Sequence and Its Significance

WANG Lijuan, PANG Jiangli, HUANG Chunchang, DING Min, NIU Xiaolu, LI Yanhua   

  1. College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi’an 710062, China
  • Received:2010-03-01 Revised:2010-07-01 Online:2011-03-25 Published:2011-03-25

摘要: 对大荔人遗址的甜水沟剖面(TSG)全新世黄土-古土壤序列中常量元素含量、磁化率和Rb/Sr 比值进行了研究和比对。结果表明:在TSG剖面发育过程中,Ca、Mg、Na表现为迁移淋失,Si、K呈现弱富集特征,Fe 的迁移不明显;磁化率、钾钠比、硅铝铁率、SiO2/(MgO+CaO)、(CaO+K2O+Na2O)/Al2O3的分布随地层的变化而同步变化。上述变化指示古土壤S0形成时期,化学风化程度强烈和气候温暖湿润,黄土L0和Lt堆积时期,风化成壤作用较弱和气候相对干旱,而全新世晚期可能曾出现过一次较为暖湿的次级气候变化。

关键词: 大荔人遗址, 风化程度, 古土壤, 黄土, 全新世, 甜水沟

Abstract: A Holocene loess-paleosol sequence was found at Tian-shui-gou (TSG) site, Dali. A detailed study on contrast the contents of major elements, magnetic susceptibility and Rb/Sr ratio was conducted in this paper to explore the environmental features in the Holocene. The analytical results show that Ca, Mg and Na are leached, Si and K are relatively enriched, but the transport phenomenon of Fe is not obvious. The distributions of magnetic susceptibility, Rb/Sr ratio, SiO2/(Al2O3+Fe2O3), SiO2/(MgO+CaO) and (CaO+K2O+Na2O)/Al2O3 imply that during the paleosol(S0) formation, chemical weathering was stronge, and the climate was warm and humid, while during the stage of loess(L0, Lt) accumulation, weathering intensity was weakened, and the climate turned to be relatively dry. There would be a climate change in the late Holocene.

Key words: Dali, Holocene, loess, paleosol, Tian-shui-gou, weathering intensity