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DOI	10.1029/2004JB003455
	New Late Cretaceous and Paleogene paleomagnetic results from south China and their geodynamic implications
	Sun, ZM; Yang, ZY; Yang, TS; Pei, JL; Yu, QF
发表日期	2006
ISSN	2169-9313
EISSN	2169-9356
卷号	111 期号:B3
英文摘要	[1] To better understand the tectonic evolution of South China Block (SCB) in response to the India-Asia collision, we present new paleomagnetic results from Late Cretaceous and Paleogene red bed formations of the Hengyang basin of Hunan province, in the interior part of the SCB. Stepwise thermal demagnetization of the rocks isolated a high-temperature component. The tilt-corrected mean direction from the Late Cretaceous rocks is D = 15.6 degrees, I = 29.9 degrees with a(95) = 5.7 degrees, N = 26 sites, corresponding to a paleopole at 71.9 degrees N, 236.3 degrees E with A(95) = 4.7 degrees, which passes reversal tests. The tilt-corrected mean direction (D = 358.9 degrees, I = 35.4 degrees with a(95) = 5.0 degrees, N = 22 sites) from the Paleogene rock, which passes the reversal test, gives a pole at 82.6 degrees N, 300.6 degrees E with A(95) = 4.4 degrees. The low-field anisotropy of magnetic susceptibility results suggest that the red beds have not experienced significant strain due to compaction or tectonic stress, while the anisotropy of isothermal remanence results suggest that postdepositional compaction in these red beds produced no more than 3 degrees- 4 degrees of inclination shallowing. These paleomagnetic and rock magnetic tests imply that the remanence is primary. On the basis of paleomagnetic results obtained from coeval basalts in Mongolia and Siberia, we suggest that no significant latitudinal motion has taken place between the SCB and Siberia since the Late Cretaceous. The significant latitudinal discrepancy between the SCB and European block could be due to nonrigid behavior of the Eurasian plate since the Late Cretaceous. A 16.7 +/- 5.0 degrees clockwise rotation of the SCB during the Late Cretaceous to the Paleogene could be related to the collision of India and Asia in the west and the subduction of the circum-Pacific plate to eastern Asia in the east.
关键词	POLAR WANDER PATHS TECTONIC IMPLICATIONS CENTRAL-ASIA SEDIMENTARY-ROCKS NORTH CHINA TARIM BASIN INDO-CHINA TIEN-SHAN MAGNETIC-ANISOTROPY GEOMAGNETIC-FIELD
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000235995400001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257439
推荐引用方式 GB/T 7714	Sun, ZM,Yang, ZY,Yang, TS,et al. New Late Cretaceous and Paleogene paleomagnetic results from south China and their geodynamic implications[J]. 中国科学院青藏高原研究所,2006,111(B3).
APA	Sun, ZM,Yang, ZY,Yang, TS,Pei, JL,&Yu, QF.(2006).New Late Cretaceous and Paleogene paleomagnetic results from south China and their geodynamic implications.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,111(B3).
MLA	Sun, ZM,et al."New Late Cretaceous and Paleogene paleomagnetic results from south China and their geodynamic implications".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111.B3(2006).