Late Paleozoic paleogeographic reconstruction of Western Central Asia   based upon paleomagnetic data and its geodynamic implications

doi:10.1016/j.jseaes.2010.07.011

CORC > 北京大学 > 地球与空间科学学院

	Late Paleozoic paleogeographic reconstruction of Western Central Asia based upon paleomagnetic data and its geodynamic implications
	Choulet, F. ; Chen, Y. ; Wang, B. ; Faure, M. ; Cluzel, D. ; Charvet, J. ; Lin, W. ; Xu, B.
刊名	journal of asian earth sciences
	2011
关键词	CAOB Junggar Paleomagnetism Strike-slip faults Tian Shan Late Paleozoic ALTAID OROGENIC COLLAGE CHINESE TIANSHAN BELT URAL-MONGOL BELT NW CHINA TECTONIC EVOLUTION NORTHWESTERN CHINA JUNGGAR BASIN TIEN-SHAN SEDIMENTARY RECORD EAST KAZAKSTAN
DOI	10.1016/j.jseaes.2010.07.011
英文摘要	Carboniferous to Permian volcanoclastic rocks have been collected from South Junggar and West Junggar. Primary magnetizations have been observed from the characteristic components of 10 sites of Early Permian (P-1) and Late Permian (P-2) red beds of South Junggar area. The 14 Early Carboniferous sites from West Junggar Mountains expose post-folding secondary magnetizations and according to their spatial distribution, 9 remagnetized sites are related to Late Carboniferous-Early Permian granite emplacement whereas 5 sites are located at the vicinity of Late Permian mafic dykes. Two new paleomagnetic poles have been consequently calculated for the periods of P-1 at 79.5 degrees N, 36.6 degrees E and of P-2 at 60.4 degrees N, 4.7 degrees E, with A(95) of 6.8 degrees and 5.4 degrees, respectively. They yield two paleomagnetic poles at 65.3 degrees N, 329.7 degrees E with A(95) of 6.3 and 64.8 degrees N, 179.5 degrees E with A(95) of 6.9 degrees, respectively. Compilation of available data shows stationary and consistent poles for South Junggar area during the Carboniferous and Permian whereas NW Junggar underwent a significant anticlockwise rotation between the Late Carboniferous-Early Permian and the Late Permian, indicating that Junggar was not a rigid block up to the end of the Paleozoic. West Junggar and South Junggar may have experienced contrasting tectonic evolutions. Comparisons of Late Paleozoic poles of Central Asia blocks show: (1) counterclockwise rotation of West Junggar with respect to Siberia, contrasting with the clockwise rotation of North Kazakhstan with respect to Siberia, (2) no significant movements between West Junggar, North Kazakhstan and Siberia since Late Permian, indicating that they were rigidly welded since that time, and (3) anticlockwise rotations of Tarim, Yili and South Junggar with respect to the welded Siberia-Kazakhstan-West Junggar block. Such rotations may have been accommodated by Late Permian to Early Triassic strike-slip faults with an estimation of the displacements of 1570 +/- 280 km along the Irtysh-Gornotsaev Shear Zone, 410 +/- 380 km along the Nikolaiev-Nalati Tectonic Line and 490 +/- 250 km along the Chingiz-Alakol-North Tian Shan Fault since Late Permian time. (C) 2010 Elsevier Ltd. All rights reserved.; Geosciences, Multidisciplinary; SCI(E); 30; ARTICLE; 5,SI; 867-884; 42
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/237656]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Choulet, F.,Chen, Y.,Wang, B.,et al. Late Paleozoic paleogeographic reconstruction of Western Central Asia based upon paleomagnetic data and its geodynamic implications[J]. journal of asian earth sciences,2011.
APA	Choulet, F..,Chen, Y..,Wang, B..,Faure, M..,Cluzel, D..,...&Xu, B..(2011).Late Paleozoic paleogeographic reconstruction of Western Central Asia based upon paleomagnetic data and its geodynamic implications.journal of asian earth sciences.
MLA	Choulet, F.,et al."Late Paleozoic paleogeographic reconstruction of Western Central Asia based upon paleomagnetic data and its geodynamic implications".journal of asian earth sciences (2011).