|Table of Contents|

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

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

Issue:
2024年第03期
Page:
364-383
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Magnetic Fabric Characteristic of Cenozoic Sediments from LuleheSection in the Northern Qaidam Basin, China and Its Tectonic Implications
Author(s):
XU Meng-qiang123 ZHENG Wen-jun123* DUAN Lei4 ZHANG Bo-xuan5 LI Yi-ge123 YANG Fu-er123
(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)
Keywords:
magnetic fabric rock magnetism tectonic strain tectonic transition Cenozoic Qaidam Basin
PACS:
P318.4
DOI:
10.19814/j.jese.2024.02022
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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Last Update: 2024-05-30