气候变化领域集成服务门户(CCPortal): Tectonic Rotation Pattern at the Northern End of the Red River Fault System in SE Tibet: New Paleomagnetic Evidence From Cretaceous Red Beds

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DOI	10.1029/2021TC007116
	Tectonic Rotation Pattern at the Northern End of the Red River Fault System in SE Tibet: New Paleomagnetic Evidence From Cretaceous Red Beds
	Wang, Heng; Yang, Zhen-Yu; Jing, Liu-Zeng; Tong, Ya-Bo; Jing, Xian-Qing
发表日期	2023
ISSN	0278-7407
EISSN	1944-9194
卷号	42 期号:3
英文摘要	In order to study the rotations of crustal material along the boundary faults in the southeastern Tibetan Plateau, and to better understand the tectonic evolution of this region, in this study we conducted a paleomagnetic study of Cretaceous red beds in the Binchuan and Xiangyun sections near the Chenghai-Binchuan fault, a branch fault at the northern end of the Red River fault in China. Analyses of rock magnetic properties and magnetization components, combined with scanning electron microscopy, show that two types of hematite are present in the Lower Cretaceous rocks: pigmentary hematite and specularite. High-temperature components (HTCs) were isolated by stepwise thermal demagnetization between 300 and 660 degrees C carried by pigmentary hematite and all of the HTCs are of normal polarity. An additional magnetization component carried by specular hematite cannot be isolated efficiently. Progressive unfolding of both the Binchuan and Xiangyun sections shows that the best grouping of the precision parameter was obtained at 75%-80% untilting, indicating that the remanence of syn-folding origin is carried by pigmentary hematite. These syn-folding remanent magnetizations indicate the Binchuan and Xiangyun sections accumulated 20.5 +/- 5.3 degrees of clockwise rotation and 9.9 +/- 4.6 degrees of counterclockwise rotation, respectively, with respect to East Asia since the early Cretaceous, despite the two sections being only similar to 45 km apart. The counterclockwise rotation of the Xiangyun section was likely caused by the left-lateral shear motion of the Red River Fault; and since the Miocene, the Binchuan section experienced integral clockwise rotations, together with most parts of the Chuan-Dian Block.
关键词	Southeast Tibetan Plateau paleomagnetism rotation remagnetization Red River fault system Cretaceous
英文关键词	CHUAN-DIAN FRAGMENT; SOUTHEASTERN MARGIN; INDO-CHINA; SHEAR ZONE; FOLD TEST; CLOCKWISE ROTATION; YANGTZE BLOCK; WEST SICHUAN; DEFORMATION; YUNNAN
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000941258800001
来源期刊	TECTONICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283548
作者单位	China Earthquake Administration; Capital Normal University; Tianjin University; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geomechanics, Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Wang, Heng,Yang, Zhen-Yu,Jing, Liu-Zeng,et al. Tectonic Rotation Pattern at the Northern End of the Red River Fault System in SE Tibet: New Paleomagnetic Evidence From Cretaceous Red Beds[J],2023,42(3).
APA	Wang, Heng,Yang, Zhen-Yu,Jing, Liu-Zeng,Tong, Ya-Bo,&Jing, Xian-Qing.(2023).Tectonic Rotation Pattern at the Northern End of the Red River Fault System in SE Tibet: New Paleomagnetic Evidence From Cretaceous Red Beds.TECTONICS,42(3).
MLA	Wang, Heng,et al."Tectonic Rotation Pattern at the Northern End of the Red River Fault System in SE Tibet: New Paleomagnetic Evidence From Cretaceous Red Beds".TECTONICS 42.3(2023).