Paleomagnetic and geochronological study of the Halaqiaola basalts, southern margin of the Altai Mountains, northern Xinjiang: Constraints on neotectonic convergent patterns north of Tibet

doi:10.1029/2005JB003890

	Paleomagnetic and geochronological study of the Halaqiaola basalts, southern margin of the Altai Mountains, northern Xinjiang: Constraints on neotectonic convergent patterns north of Tibet
	Huang, BC ; He, HY ; Zhang, CX ; Zhu, RX
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2006-01-13
卷号	111 期号:B1
ISSN号	2169-9313
DOI	10.1029/2005JB003890
文献子类	Article
英文摘要	A combined geochronological and paleomagnetic study is reported from Miocene basalts from Halaqiaola and Paleocene to Eocene red beds from Fuyun at the southern Altai Mountains, northern Xinjiang. Three new Ar-40/Ar-39 ages determined by fresh matrix from the Halaqiaola basalts collectively confirm the presence of Cenozoic magmatic activity in the northern Xinjiang. Alternating field and thermal demagnetization identify stable characteristic remanences with single reversed polarity in the basalts and red beds. Rock magnetic analysis identifies pseudosingle-domain titanomagnetites as carriers of remanence in the basalts. Paleomagnetic results from the Fuyun red beds indicate that inclination shallowing is present in this rock facies as also found in previous red bed studies from central Asia. In contrast, the time-averaged paleomagnetic direction from the basalts shows that no paleomagnetically discernible northward convergence has occurred north of Junggar since early Miocene times. Analysis of available Cretaceous and Cenozoic paleomagnetic data from volcanic rocks in central Asia shows that Neogene and Quaternary paleolatitudes are statistically concordant with predicted values from Eurasian references, suggesting that no significant northward convergence has occurred north of Tibet during the last 20 Myr. Cretaceous and Paleogene paleolatitudes lie similar to 5-6 +/- 7 degrees south of predicted values from the Eurasian path and suggest that neotectonic convergence of the order of several hundred kilometers has occurred north of the southwest Tian Shan. It is possible that neotectonic northward convergence north of Tibet will prove to be paleomagnetically undetectable, but more data are required to confirm this.
WOS关键词	INDIA-EURASIA COLLISION ; CENTRAL-ASIA ; TIEN-SHAN ; TECTONIC EVOLUTION ; MAGNETIC-ANISOTROPY ; VOLCANIC-ROCKS ; TARIM BASIN ; TIAN-SHAN ; RED BEDS ; CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000234996600001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66006]
专题	中国科学院地质与地球物理研究所
通讯作者	Huang, BC
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Paleomagnetism & Geochronol Lab, Beijing 100029, Peoples R China 2.Univ Liverpool, Dept Earth & Ocean Sci, Geomagnetism Lab, Liverpool L69 7ZE, Merseyside, England
推荐引用方式 GB/T 7714	Huang, BC,He, HY,Zhang, CX,et al. Paleomagnetic and geochronological study of the Halaqiaola basalts, southern margin of the Altai Mountains, northern Xinjiang: Constraints on neotectonic convergent patterns north of Tibet[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2006,111(B1).
APA	Huang, BC,He, HY,Zhang, CX,&Zhu, RX.(2006).Paleomagnetic and geochronological study of the Halaqiaola basalts, southern margin of the Altai Mountains, northern Xinjiang: Constraints on neotectonic convergent patterns north of Tibet.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,111(B1).
MLA	Huang, BC,et al."Paleomagnetic and geochronological study of the Halaqiaola basalts, southern margin of the Altai Mountains, northern Xinjiang: Constraints on neotectonic convergent patterns north of Tibet".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111.B1(2006).