Paleomagnetism and tectonics of the southern Tarim basin, northwestern China

	Paleomagnetism and tectonics of the southern Tarim basin, northwestern China
	Gilder, S ; Zhao, XX ; Coe, R ; Meng, ZF ; Courtillot, V ; Besse, J
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	1996-10-10
卷号	101 期号:B10 页码:22015-22031
ISSN号	2169-9313
文献子类	Article
英文摘要	We report Late Carboniferous, Permian, and early Tertiary paleomagnetic data from the southern Tarim basin. Prefolding magnetizations were isolated in each case. The Late Carboniferous-Permian and early Tertiary poles lie at 64.6 degrees N, 166.5 degrees E, A(95)=6.3 degrees and 58.1 degrees N, 202.0 degrees E, A(95)=12.7 degrees, respectively. The Late Jurassic to early Tertiary (J3-E1) paleolatitudes of Tarim and several basins throughout central Asia are similar, yet significantly (10 degrees to 20 degrees) shallower than those predicted by the Eurasian apparent polar wander path. Resolving this discrepancy remains a ma,;or problem in Asian paleomagnetism. Discordance of the late Paleozoic poles from Tarim and Siberia suggest that Tarim has rotated about 30 degrees counterclockwise with respect to Siberia since the Permian. Where paleomagnetic samples of both Late Carboniferous to Early Triassic (C3-T1) and J3-E1 ages were collected from the same area of Tarim, a great circle passes through the means of the poles and the sampling locality. This suggests that (1) only a difference in inclination (and not declination) distinguishes the two data sets, and (2) vertical axis block rotations of the C3-E1 strata occurred after E1. Although based on data of lesser quality, the mean Early to Middle Jurassic (J1-2) pole from Tarim differs significantly from the Eurasian reference pole, requiring radical tectonic solutions to resolve them. The Tarim J1-2 pole is indistinguishable from both the mean J3-E1 and C3-T1 poles. The similarity of all the poles and the analogous tectonic setting of present-day central Asia to that of the late Paleozoic in eastern North America raises the question whether all the data from Tarim are overprinted.
WOS关键词	POLAR WANDER PATH ; WEST JUNGGAR REGION ; NORTH TARIM ; TIEN-SHAN ; BLOCK ; XINJIANG ; COLLISION ; EURASIA ; DEFORMATION ; KAZAKHSTAN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:A1996VM54400014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74876]
专题	中国科学院地质与地球物理研究所
通讯作者	Gilder, S
作者单位	1.UNIV CALIF SANTA CRUZ, DEPT EARTH SCI, SANTA CRUZ, CA 95064 USA 2.CHINESE ACAD SCI, INST GEOL, LANZHOU 730000, GANSU, PEOPLES R CHINA
推荐引用方式 GB/T 7714	Gilder, S,Zhao, XX,Coe, R,et al. Paleomagnetism and tectonics of the southern Tarim basin, northwestern China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,1996,101(B10):22015-22031.
APA	Gilder, S,Zhao, XX,Coe, R,Meng, ZF,Courtillot, V,&Besse, J.(1996).Paleomagnetism and tectonics of the southern Tarim basin, northwestern China.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,101(B10),22015-22031.
MLA	Gilder, S,et al."Paleomagnetism and tectonics of the southern Tarim basin, northwestern China".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 101.B10(1996):22015-22031.