会宁剖面MIS3阶段黄土元素地球化学特征及气候变化

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

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. 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
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. 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 Published:2013-01-15 Online:2013-01-16

摘要/Abstract

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

翟新伟, 吴松, 李富强. 会宁剖面MIS3阶段黄土元素地球化学特征及气候变化[J]. 干旱区研究, 2013, 30(1): 156-161.

DI Xin-Wei, WU Song, LI Fu-Qiang. Geochemistry Characteristics of Elements in Loess in the Huining Profile in MIS3 and Climate Change[J]. , 2013, 30(1): 156-161.

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