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地球科学进展  2014, Vol. 29 Issue (3): 369-380    DOI: 10.11867/j.issn.1001-8166.2014.03.0369
研究论文     
风成红黏土序列磁化率各向异性特征对区域应力变化的响应
高新勃1, 2, 强小科1, *, 赵辉1, 2, 陈艇1, 2
1.中国科学院地球环境研究所,黄土与第四纪国家重点实验室,陕西 西安 710075;
2.中国科学院大学,北京 100049
Anisotropy of Magnetic Susceptibility Response to the Regional Stress Variation in Aeolian Red Clay Sequence
Gao Xinbo1, 2, Qiang Xiaoke1, Zhao Hui1, 2, Chen Ting1, 2
1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075;
2. University of Chinese Academy of Sciences, Beijing 100049, China
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摘要:

对六盘山以西132 m水洛红黏土剖面磁化率各向异性特征的研究表明,水洛红黏土剖面记录的14.8~8.7 Ma沉积序列受到了同沉积时期不同程度的应力作用,磁化率各向异性变化特征对应于应力作用强度较弱的初期和应力作用强度有所加强的中期。进一步分析发现,14.8~11.0 Ma之间显示出3次应力增强和后续应力减弱交替变化的特点,这一应力作用事件可能与青藏高原东北缘在此阶段强烈构造活动的区域应力传递相关,而11.0~8.7 Ma期间存在一个相对较强的应力作用事件,可能是对局部地区应力增强事件的响应。

关键词: 磁化率各向异性红黏土应力变化    
Abstract:

The Aeolian sediment sequences from the Chinese Loess Plateau record abundant paleoclimatic and paleoenvironmental information, while little is known about whether there were any stress effect during the sedimentary period. In terms of tracking stress variation, anisotropy of magnetic susceptibility(AMS) has some particular advantages in comparison with other traditional methods. Systematic magnetostratigraphy, rock magnetism and anisotropy of magnetic susceptibility analysis were carried out on Shuiluo Aeolian red clay profile, which is located at the western Liupan Mountain. In the field, there are not any obvious tectonic traces that can be observed, which indicates the primitive deposit, but AMS results have many distinct differences between Shuiluo aeolian red clay profile and other typical aeolian sediment sequences(loess/paleosol, red clay). These differences mainly manifest from the following aspects. Firstly, abundant magnetic ellipsoid is located in the prolate area; Secondly, the stereonet projections of the κmax and κmin principle axes of AMS ellipsoids show that the κmax axes are well grouped in an approximately east-west direction, while the κmin shows a slight girdle in an approximately north-south direction; and in addition, the Pj-T diagram shows that the magnetic ellipsoid is being transition from oblate to prolate magnetic ellipsoid. These characteristics listed above suggested that Shuiluo red clay profile had gone through a weakly stress effect, and comparing with previous research we infer that these AMS characteristics be correspondent to the incipient deformation with a weaker stress intensity and the moderate deformation with a stronger stress intensity. After further classification, comparison and using a variety of analysis methods, we find that from 14.8 Ma to 11.0 Ma, the stress state is accompanied by three stress increase and decrease alternately, and these stress effects may correspond to the stress from the northwest Tibetan plateau. In about 11.0~8.7 Ma, AMS shows a strong stress effect, and almost all AMS ellipsoid is located in the prolate magnetic ellipsoid area. At the same time, the κmin axes shows a strong girdle in an approximately north-south direction and it should be in response to the stress increasing in the local area.

Key words: Anisotropy of magnetic susceptibility    Stress variation    Red clay
收稿日期: 2013-09-16 出版日期: 2014-03-10
:  P318  
基金资助:

中国科学院战略性先导科技专项“高原隆升对季风演化的影响”(编号:XDB03020504); 国家自然科学基金项目“中—上新世红黏土磁性矿物的转化机制及其对东亚夏季风变化的响应”(编号:41072142)资助

通讯作者: 强小科(1969-),男,陕西岐山人,研究员,主要从事磁性地层学、岩石磁学、新生代地质与全球变化研究.   
作者简介: 高新勃(1989-),男,陕西铜川人,硕士研究生,主要从事环境磁学研究.E-mail:gxbpaleomag@foxmail.com
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引用本文:

高新勃, 强小科, 赵辉, 陈艇. 风成红黏土序列磁化率各向异性特征对区域应力变化的响应[J]. 地球科学进展, 2014, 29(3): 369-380.

Gao Xinbo, Qiang Xiaoke, Zhao Hui, Chen Ting. Anisotropy of Magnetic Susceptibility Response to the Regional Stress Variation in Aeolian Red Clay Sequence. Advances in Earth Science, 2014, 29(3): 369-380.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2014.03.0369        http://www.adearth.ac.cn/CN/Y2014/V29/I3/369

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