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.0.Early Cretaceous paleomagnetic characteristics of Yuanma Basin,western Hunan and the indications to the structural deformation of eastern Sichuan fold belt.Chinese Journal of Geophysics (in Chinese),(): 1-,doi: 10.6038/cjg2021O0482
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| Early Cretaceous paleomagnetic characteristics of Yuanma Basin,western Hunan and the indications to the structural deformation of eastern Sichuan fold belt |
| WANG ChenXu1,4，TONG YaBo1,2*，YANG ZhenYu3，SUN YuJun4，YANG XiangDong1,2，SUN XinXin3 |
| 1 Institude of Geomechanics,Chinese Academy of Geological Sciences, Beijing 100081,China
2 Key Laboratory of Paleomagnetism and Tectonic Reconstruction,the Ministry of Land and Resources, Beijing 100081,China
3 College of Resources,Environment and Tourism,Capital Normal University, Beijing 100048, China
4 Zhangqiu Wanda Project Department of China Construction Second Engineering Bureau Ltd., Jinan 250200,China |
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Abstract The East Sichuan Fold Belt (ESFB) in the central part of the South China Block (SCB) was initially formed in the Late Paleozoic. Since the Late Cretaceous, the ESFB was furtherly affected by the combined actions of the Pacific and Neo-Tethyan structural domains since the Late Cretaceous. The tectonic evolution of the ESFB since the Late Cretaceous was still ambiguous until now. The Yuanma Basin between the east margin of the ESFB and the Xuefeng Orogenic Belt was formed in the Cretaceous and was filled by red-beds strata. This basin probably reserved the information of the tectonic stress environment of the ESFB since the Early Cretaceous. The present work conducted paleomagnetic studies in the Early Cretaceous red-beds of the Yuanma Basin, which obtained a primary magnetic component with the site-mean direction of Ds=15.6, Is=42.9, k=118.6, α95=2.6. The result shows that the Yuama Basin experienced 4.1±3.0° of clockwise rotation relative to the eastern part of the SCB, since the Early Cretaceous. The linear correlation analysis of the rotational characteristics and the tectonic lines being composed by faults and fold axis around the ESFB, indicate that the ESFB at the Qiyueshan fault’s southeast side as the predominant tectonic belt on the western margin of the ESFB, experienced right-lateral shearing, with a total offsets of 50-93 km in the Upper Cretaceous, which was probably induced by the compressions between the Indian Plate and Eurasia, and the Pacific Plate and the SCB.
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