New Early Cretaceous paleomagnetic results from Qilian orogenic belt and;its tectonic implications

doi:10.1360/02yd9059

	New Early Cretaceous paleomagnetic results from Qilian orogenic belt and;its tectonic implications
	Yang, TS 3; Yang, ZY ; Sun, ZM ; Lin, AM
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2002
卷号	45 期号:6 页码:565-576
关键词	Qilian mountain paleomagnetism Early Cretaceous Hekou group
ISSN号	1006-9313
DOI	10.1360/02yd9059
英文摘要	Lower Cretaceous red sedimentary rocks from the depositional basin of East Qilian fold belt have been collected for a paleomagnetic study. Stepwise thermal demagnetization reveals two or three components of magnetization from dark red sandstones. Low-temperature magnetic component is consistent with the present Earth Field direction in geographic coordinates. High-temperature magnetic components are mainly carried by hematite. The mean pole of 19 sites for high-temperature magnetic components after tilt-correction is lambda=62.2degrees N, phi =193.4degrees E, A(95)=3.2degrees, and it passes fold tests at 99% confidence level and reversal tests at 95% confidence level. The paleopole is insignificantly different from that of Halim et al. (1998) from the same sampling area at the 95% confidence level. Compared with paleomagnetic results for North China, South China, and Eurasia, our results suggest that no significant relative latitudinal displacement has taken place between Lanzhou region and these blocks since Cretaceous time. Remarkably, the pole of Lanzhou shows a 20degrees clockwise rotation with respect to those of North China, South China, and Eurasia. Geological information indicates that the crustal shortening in the western part of Qilian is greater than that in eastern part. In this case, the clockwise rotation of sampling area was related to India/Eurasia collision, and this collision resulted in a left-lateral strike-slip motion of the Altun fault in north Tibetan Plateau after the Cretaceous.
学科主题	地层学与地史学
WOS关键词	NORTH CHINA BLOCK ; POLAR WANDER PATH ; MAJOR BLOCKS ; CONSTRAINTS ; COLLISION ; ASIA ; DISCOVERY ; ECLOGITE ; HISTORY ; BASIN
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000175593200010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37540]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China. 2.Univ Shizuoka, Dept Earth & Planetary Sci, Shizuoka, Japan. 3.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Yang, TS,Yang, ZY,Sun, ZM,et al. New Early Cretaceous paleomagnetic results from Qilian orogenic belt and;its tectonic implications[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2002,45(6):565-576.
APA	Yang, TS,Yang, ZY,Sun, ZM,&Lin, AM.(2002).New Early Cretaceous paleomagnetic results from Qilian orogenic belt and;its tectonic implications.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,45(6),565-576.
MLA	Yang, TS,et al."New Early Cretaceous paleomagnetic results from Qilian orogenic belt and;its tectonic implications".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 45.6(2002):565-576.