SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area, Beishan Rift, Xinjiang Autonomous Region, China Implications for Tectonic Setting and Mantle Plume Events

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	SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area, Beishan Rift, Xinjiang Autonomous Region, China Implications for Tectonic Setting and Mantle Plume Events
	Mao, JW (Mao Jingwen); Pirajno, F (Pirajno, Franco); Zhang, ZH (Zhang Zuoheng); Wan, YS (Wan Yusheng)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2012
卷号	86 期号:4 页码:879-884
关键词	Alkaline dykes SHRIMP tectonic setting mantle plume China
ISSN号	1000-9515
英文摘要	In the Beishan rift in the eastern Tianshan orogen, Xinjiang Province, a N-S-trending dyke swarm is present in the Pobei area. The swarm cuts through the 270-290 Ma mafic-ultramafic intrusions associated with Ni-Cu sulphide mineralization. These mafic-ultramafic intrusions are typically found along E-W major faults in the Tianshan orogenic belts. We report SHRIMP U-Pb dating of zircons from a dyke of alkaline composition, which yielded a mean age of 252 +/- 9 Ma. Alkaline dykes of the same age are found in the Altay region of Siberia. This age is younger than the 270-290 Ma intraplate magmatic events that produced the mafic-ultramafic intrusions in the region, but in general agreement with the 250-260 Ma Permian plume event that gave rise to the Siberian traps and the Emeishan flood basalts in SW China. We suggest that there is a link between the Emeishan event and the dyke swarm in the Beishan rift and that the intraplate magmatism at 270-290 Ma reflects an early stage of mantle plume activity. The N-S trending dyke swarm in the Beishan rift may represent a later stage in the evolution of mantle plume activity in the NW and SW of China. We also speculate that in Beishan rift and possibly elsewhere in the Tianshan region, the dykes fed basaltic volcanism, whose products have since been eroded due to the strong uplift of the Tianshan orogen as a result of the India-Eurasia collision in the Cenozoic.
学科主题	构造地质学
WOS关键词	FLOOD-BASALT PROVINCE ; NI SULFIDE DEPOSITS ; ASIAN OROGENIC BELT ; NW CHINA ; NORTHWEST CHINA ; PALEOZOIC ACCRETIONARY ; NORTHERN XINJIANG ; MAFIC INTRUSIONS ; ALTAY OROGENS ; EAST TIANSHAN
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000307378800008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39532]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Mao, JW ,Pirajno, F ,Zhang, ZH ,et al. SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area, Beishan Rift, Xinjiang Autonomous Region, China Implications for Tectonic Setting and Mantle Plume Events[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2012,86(4):879-884.
APA	Mao, JW ,Pirajno, F ,Zhang, ZH ,&Wan, YS .(2012).SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area, Beishan Rift, Xinjiang Autonomous Region, China Implications for Tectonic Setting and Mantle Plume Events.ACTA GEOLOGICA SINICA-ENGLISH EDITION,86(4),879-884.
MLA	Mao, JW ,et al."SHRIMP Zircon U-Pb Dating of Alkaline Dykes in the Pobei Area, Beishan Rift, Xinjiang Autonomous Region, China Implications for Tectonic Setting and Mantle Plume Events".ACTA GEOLOGICA SINICA-ENGLISH EDITION 86.4(2012):879-884.