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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第46卷

期数:

2024年第03期

页码:

364-383

栏目:

基础地质与矿床地质

出版日期:

2024-05-15

文章信息/Info

Title:

Magnetic Fabric Characteristic of Cenozoic Sediments from LuleheSection in the Northern Qaidam Basin, China and Its Tectonic Implications

文章编号:

1672-6561(2024)03-0364-20

作者:

许梦强¹; 2; 3; 郑文俊¹; 2; 3*; 段磊⁴; 张博譞⁵; 李一格¹; 2; 3; 杨俯尔¹; 2; 3

(1. 中山大学 地球科学与工程学院,广东 珠海 519082; 2. 广东省地球动力作用与地质灾害重点实验室,广东 珠海 519082; 3. 南方海洋科学与工程广东省实验室(珠海),广东 珠海 519082; 4. 中国铁道科学研究院集团有限公司 铁道建筑研究所,北京 100081; 5. 中国地震局地质研究所 地震动力学国家重点实验室,北京 100029)

Author(s):

XU Meng-qiang¹; 2; 3;  ZHENG Wen-jun¹; 2; 3*;  DUAN Lei⁴;  ZHANG Bo-xuan⁵;  LI Yi-ge¹; 2; 3;  YANG Fu-er¹; 2; 3

(1. School of Earth Sciences and Engineering, Sun Yat-sen University, Zhuhai 519082, Guangdong, China; 2. Guangdong Provincial KeyLaboratory of Geodynamics and Geohazards, Zhuhai 519082,Guangdong, China; 3. Southern Marine Science and EngineeringGuangdongLaboratory(Zhuhai),Zhuhai 519082, Guangdong, China; 4. Railway Engineering ResearchInstitute, China Academy ofRailway Sciences Corporation Limited, Beijing 100081, China; 5. State Key Laboratory of EarthquakeDynamics, Institute ofGeology,ChinaEarthquake Administration, Beijing 100029, China)

关键词:

磁组构;  岩石磁学;  构造应力;  构造转换;  新生代;  柴达木盆地

Keywords:

magnetic fabric;  rock magnetism;  tectonic strain;  tectonic transition;  Cenozoic;  Qaidam Basin

分类号:

P318.4

DOI:

10.19814/j.jese.2024.02022

文献标志码:

A

摘要:

柴达木盆地是青藏高原北部面积最大、地层厚度超过10 km的新生代沉积盆地。通过揭示盆地内新生代地层保存的磁组构信息,可以重建区域构造应力方向,进而探讨青藏高原北部构造变形及其动力学机制。通过对柴达木盆地北缘路乐河新生代地层样品各方向磁化率进行测量,获得了1 070个样品的磁组构信息,并对磁组构形态和相关参数进行分析。结果表明:柴达木盆地北缘路乐河剖面23.7～9.9 Ma地层的磁组构表现为初始变形磁组构,磁线理指示了挤压应力的方向,9.9～5.2 Ma地层的磁组构以沉积磁组构为特征,未记录到明显构造应力方向。利用磁偏角去除构造旋转的影响后,路乐河剖面沉积地层磁组构记录的挤压应力方向在不同的时段存在差异。23.7～18.1 Ma聚集在约25°方向,揭示柴达木盆地北缘早中新世遭受近SN向挤压应力; 18.1～15.2 Ma挤压应力方向发生逆时针旋转,由约25°旋转至约-20°; 15.2～9.9 Ma挤压应力方向发生顺时针旋转,由约-20°旋转至约20°。这些结果揭示柴达木盆地北缘挤压应力方向在中中新世先发生逆时针旋转(18.1～15.2 Ma),后发生顺时针旋转(15.2～9.9 Ma)。综合周边的构造格架及前人构造变形分析的相关结果认为,柴达木盆地北缘中中新世以来构造应力的旋转可能与东昆仑山和祁连山双向挤压应力的叠加紧密相关。

Abstract:

The Qaidam Basin is the largest Cenozoic sedimentary basin on the northern part of Qinghai-Xizang Plateau, with a stratum thickness exceeding 10 km. By revealing the magnetic fabric information preserved in Cenozoic within the basin, it is possible to reconstruct the regional tectonic stress orientation, which is of great significance for exploring the tectonic deformation and dynamic mechanism in the northern part of Qinghai-Xizang Plateau. The anisotropy of magnetic susceptibility in various directions of Cenozoic strata samplesfrom Lulehe section inthe northernQaidam Basinwas measured. Subsequently, magnetic fabric information was obtained from 1 070 samples, and an analysis was conducted on the morphology of the magnetic fabric and its related parameters. The results show that the magnetic fabric ofstrata during23.7-9.9 Main Lulehe section showsan initial deformation magneticfabric, with its magnetic lineation indicating the direction of compression stress. The magnetic fabric ofstrata during9.9-5.2 Mais characterized by sedimentary fabric, and no obvious tectonic stress direction is recorded. After removing the effects of structural rotation using magnetic declination, variations are observed in the orientation of the compressive stress recorded bythemagnetic fabric in Lulehe section over different periods, respectively. During 23.7-18.1 Ma, it gathers at ～25°, revealing that the northernQaidam Basin suffers from nearSNcompression stress in the Early Miocene. During 18.1-15.2 Ma, the direction of compressive stress rotates counterclockwise from ～25° to ～-20°. During 15.2-9.9 Ma, the direction of compressive stress rotates clockwise from ～-20° to ～20°. These results reveal that the compression stress direction of the northernQaidam Basin first rotates counterclockwise(18.1-15.2 Ma)and then rotates clockwise(15.2-9.9 Ma)in the MiddleMiocene. Based on the surrounding tectonic framework and the previous analysis of tectonic deformation, it is considered that the rotation of tectonic stress on the northern margin of Qaidam Basin since the Middle Miocene may be closely related to the superposition of bidirectional compression stress from East Kunlun and Qilian Mountains.

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收稿日期:2024-02-29; 修回日期:2024-04-05
基金项目:第二次青藏高原综合科学考察研究项目(2019QZKK0901); 国家自然科学基金项目(41872204,42030301)
*通信作者:郑文俊(1972-),男,甘肃高台人,中山大学教授,博士研究生导师,理学博士,E-mail:zhengwenjun@mail.sysu.edu.cn。

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