干旱区研究

干旱区研究 ›› 2013, Vol. 30 ›› Issue (1): 156-161.

• 生态与环境 • 上一篇    下一篇

会宁剖面MIS3阶段黄土元素地球化学特征及气候变化

翟新伟1, 吴松1, 李富强2   

  1. 1. 兰州大学地质科学与矿产资源学院，甘肃　兰州 730000;  2. 兰州大学西部环境与气候变化研究院，甘肃　兰州 730000
  • 收稿日期:2012-03-21 修回日期:2012-06-21 出版日期:2013-01-15 发布日期:2013-01-16
  • 通讯作者: 吴松.E-mail: wusong11@lzu.edu.cn
  • 作者简介:翟新伟(1976-)，男，副教授，博士，主要研究方向为第四纪地质学与构造地质.E-mail: zhaixw926@lzu.edu.cn
  • 基金资助:

    国家自然科学基金(40701193)；中央高校基本科研基金(LzuJbky-2012-127)共同资助

Geochemistry Characteristics of Elements in Loess in the Huining Profile in MIS3 and Climate Change

 DI  Xin-Wei1, WU  Song1, LI  Fu-Qiang2   

  1. 1. College of Earth Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Key Laboratory of West China's Environmental Systems of Ministry of Education, Lanzhou University, Lanzhou 730000, China
  • Received:2012-03-21 Revised:2012-06-21 Online:2013-01-15 Published:2013-01-16

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摘要： 在会宁剖面元素地球化学数据分析和气候替代指标分析的基础上，重建了会宁地区约20～70 ka的古气候特征和序列。研究表明：Ba、Rb、Sr、Ti、Fe2O3、SiO2、Al2O3、MgO、K2O等在剖面上都有随深度的减小含量随之增加的趋势；CaO、Na2O等在剖面上有随深度的减小含量随之减小的趋势。MIS3气候略显温湿，可划分为3个阶段：早期(L1S1S2)，55.5～45.9 ka，气候为弱温湿；中期(L1S1L1)，45.9～27.3 ka，气候为干冷；晚期(L1S1S1)，27.3～23.8 ka，气候为温湿；会宁剖面较明显地记录了5次Heinrich事件。

关键词: 会宁剖面, 地球化学, 古气候, MIS3阶段, Heinrich事件, 甘肃

Abstract: Based on the geochemical data of elements and the paleoclimate proxies, the paleoclimate change in the Huining region during 20-70 kaBP was reconstructed. The geochemical results of elements showed that the contents of Ba, Rb, Sr, Ti, Fe2O3, SiO2, Al2O3, MgO and K2O were increased but those of CaO and Na2O were decreased with the decrease of loess depth along the profile. The proxies revealed that it was cold and dry during 69.9-55.5 ka (MIS4), and the quick loess accumulation was revealed by the low contents of Rb, Ti and Rb/Sr and the high contents of Na2O/Al2O3 and CaO/MgO. Compared with the data during the MIS4 period, the contents of Sr, Na2O and Na2O/Al2O3 were low during 55.5-23.8 ka (MIS3), those of Rb, Fe2O3, K2O and Rb/Sr were high, and they could be divided into three subparts (L1S1S2, L1S1L1 and L1S1S1). At the early stage (L1S1S2), 56.5-47.0 ka, it was slightly warm and rainy. During the mediumterm (L1S1L1), 47.0-28.6 ka, it was dry and cold. The Huining profile revealed that it was the driest and coldest period. The late stage (L1S1S1), 28.6-25.2 ka, was characterized by warm and rainy. It was cold and dry again at 25.2-23.2 ka (MIS2); Based on the geochemical data and proxies, five Heinrich events may be recorded in the Huining loess profile, i.e. the H2(22.36-23.32 ka), H3(30.5-31.5 ka), H4(38.2-39.2 ka), H5(43.0-44.0 ka) and H6(61.24-62.20 ka).  

Key words: Huining profile, geochemystry, paleoclimate change, MIS3, Heinrich event, Gansu Province