Zircon U-Pb age for rhyolite of the Maoniushan Formation and its tectonic significance in the East Kunlun Mountains.

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	Zircon U-Pb age for rhyolite of the Maoniushan Formation and its tectonic significance in the East Kunlun Mountains.
	Lu, L (Lu Lu); Wu, ZH (Wu ZhenHan); Hu, DG (Hu DaoGong); Barosh, PJ (Barosh, Patrick J.); Hao, S (Hao Shuang); Zhou, CJ (Zhou ChunJing)
刊名	ACTA PETROLOGICA SINICA
	2010
卷号	26 期号:4 页码:1150-1158
关键词	Maoniushan Formation Rhyolite Zircon U-Pb age Late Silurian-Early Devonian East Kunlun orogenic belt
ISSN号	1000-0569
英文摘要	The Maoniushan Formation of molasse, formed in a post-orogenic volcano-sedimentary basin at the Shuinichang area in the East Kunlun Mountains, rest unconformably on pre-Devonian strata and its forming time is important for determining the closure of the Early Paleozoic Ocean in this region. We made zircon U-Pb dating for rhyolite interlayers from different levels of this formation by LA-MC-ICPMS. The rhyolite (sample B743-2) above the basal conglomerate of the Maoniushan Formation on the northern margin of the basin yielded an average zircon U-Pb age of 423.2 +/- 1.8Ma and the rhyolite (sample B820-1) above the basal conglomerate of the formation on the west margin of the basin yielded an average zircon U-Pb age of 408.2 +/- 2.4Ma. The rhyolite interlayers (samples B705-1 and B656-1) from detrital rocks of the middle-upper formation yielded two average zircon U-Pb ages; 404.9 +/- 4.8Ma and 399.6 +/- 2.8Ma. These ages should represent the forming times for different levels of the Maoniushan Formation and thus provide a constrain to the forming time of the formation in this area, that is, 400 similar to 423Ma. Therefore, it is suggested that the closure time of the Early Paleozoic Ocean should be in the Late Silurian. The discovery of 2468 similar to 920Ma zircon of the Proterozoic age in the rhyolite shows that the metamorphic basement south of the East Kunlun Mountains would be similar to that of the Yangtze plate and would develop during the formation of the Rodinia supercontinent 900 similar to 1000Ma ago.
学科主题	火成岩岩石学
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000277950600012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39230]
专题	中国地质调查局
作者单位	Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China
推荐引用方式 GB/T 7714	Lu, L ,Wu, ZH ,Hu, DG ,et al. Zircon U-Pb age for rhyolite of the Maoniushan Formation and its tectonic significance in the East Kunlun Mountains.[J]. ACTA PETROLOGICA SINICA,2010,26(4):1150-1158.
APA	Lu, L ,Wu, ZH ,Hu, DG ,Barosh, PJ ,Hao, S ,&Zhou, CJ .(2010).Zircon U-Pb age for rhyolite of the Maoniushan Formation and its tectonic significance in the East Kunlun Mountains..ACTA PETROLOGICA SINICA,26(4),1150-1158.
MLA	Lu, L ,et al."Zircon U-Pb age for rhyolite of the Maoniushan Formation and its tectonic significance in the East Kunlun Mountains.".ACTA PETROLOGICA SINICA 26.4(2010):1150-1158.