Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang

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	Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang
	Chai, FM (Chai FengMei); Mao, JW (Mao JingWen); Dong, LH (Dong LianHui); Yang, FQ (Yang FuQuan); Liu, F (Liu Feng); Geng, XX (Geng XinXia); Zhang, ZX (Zhang ZhiXin); Huang, CK (Huang ChengKe)
刊名	ACTA PETROLOGICA SINICA
	2009
卷号	25 期号:6 页码:1403-1415
关键词	Meta-rhyolites Geochemistry SHRIMP zircon U-Pb dating Southern margin of the Altay
ISSN号	1000-0569
英文摘要	SHRIMP U-Pb zircon ages and geochemical data of whole rocks are reported for meta-rhyolites from the Kangbutiebao Formation in the Kelang basin at the southern margin of Altay orogenic belt. The zircons with well-defined oscillatory zoning from three meta-rhyolite samples yielded mean (206)Pb/(238)U ages of 412.6 +/- 3.5 Ma, 408.7 +/- 5.3Ma and 406.7 +/- 4.3Ma, which are interpreted as the eruption age of the volcanic rocks of the Kangbutiebao Formation. Meta-rhyolites are high in the concentrations of SiO(2) (72.46% similar to 80.07%) and total alkali (Na(2)O + K(2)O) (6.38% similar to 11.34%), and they have low concentrations of Al(2)O(3) (9.68% similar to 12.19%). TiO(2) (0.17% similar to 0.35%), MgO (0.08% similar to 0.48% CaO (0.14% similar to 0.73%) and FeO(T) ( 0.34% similar to 0.55% which are defined as sub-alkaline volcanic rock series. They display obvious negative anomaly of Ti, P, Sr and Ba, obvious enrichment of LREE and HFSE (Nb, Ta, Zr and Hf), noticeable negative Eu anomalies (delta Eu = 0.51 similar to 0.71) characteristics, resembling those of felsic volcanic rocks formed in an active continental margin. The regional geology and geochemical evidence indicate that these rhyolites were generated by partial melting of lower crust in an active continental margin, and the residues were plagioclase, amphibole, and apatite. The primitive magma was likely resulted from the underplating, and underwent fractional crystallization and minor wall-rocks assimilation during the ascending of magma.
学科主题	火成岩岩石学
WOS关键词	TRACE-ELEMENT EVIDENCE ; TECTONIC EVOLUTION ; NORTHWEST CHINA ; ROCKS ; DISCRIMINATION ; GEOCHEMISTRY ; MOUNTAINS ; ARC ; PETROGENESIS ; ACCRETIONARY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000267571400011
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38859]
专题	中国地质调查局
作者单位	Xinjiang Nonferrous Geoexplorat Bur, Geol Team 706, Altay 830065, Peoples R China
推荐引用方式 GB/T 7714	Chai, FM ,Mao, JW ,Dong, LH ,et al. Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang[J]. ACTA PETROLOGICA SINICA,2009,25(6):1403-1415.
APA	Chai, FM .,Mao, JW .,Dong, LH .,Yang, FQ .,Liu, F .,...&Huang, CK .(2009).Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang.ACTA PETROLOGICA SINICA,25(6),1403-1415.
MLA	Chai, FM ,et al."Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang".ACTA PETROLOGICA SINICA 25.6(2009):1403-1415.