Geochemical characteristics of acidic dike swarm from the eastern segment of the Ertix tectonic belt, Altai orogeny and its geological implications

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	Geochemical characteristics of acidic dike swarm from the eastern segment of the Ertix tectonic belt, Altai orogeny and its geological implications
	Gong, HL (Gong HongLiang); Chen, ZL (Chen ZhengLe); Hu, YQ (Hu YuanQing); Li, L (Li Li); Lai, XR (Lai XinRong); Ma, QY (Ma QingYou); Li, YY (Li YuYing); Hu, B (Hu Bo); Zhang, WG (Zhang WenGui)
刊名	ACTA PETROLOGICA SINICA
	2007
卷号	23 期号:5 页码:889-899
关键词	acidic dike swarm geochemistry A-type granitoids Ertix tectonic belt Altai orogeny
ISSN号	1000-0569
英文摘要	Field investigation revealed series of undeformed acidic dike swarm developed between the Ertix active fault and the Fuyun-Xibodu fault in the eastern segment of the Ertix tectonic belt, southern Altai orogeny, where Hercynian gneissic granites and the Upper Carboniferous Ertix Formation outcropped. The content of SiO2 in the dike is 70.9% similar to 75.38%, and that of K2O + Na2O is 7.55% similar to 8.99%. For most of samples, the content of Na is larger than that of K. The Rittmann index (delta) varies from 1.8 to 2.5. The content of Al2O3 equals to 12.8% similar to 14. 3%. The value of A/CNK is 0.9 similar to 1.1, and that of NK/A ranges from 0.7 to 0 9, suggesting that the dike should be attributed to A-type granitoids and sub-alkaline rock with metaluminous-low peraluminous character and lower Magnesium, higher Kalium and Natrium, lower Calcium and Strontium, and higher (Fe/Mg)(mol). Analyses of trace and rare earth elements showed that these rocks are rich of light rare earth elements and relatively rich of great ion lithophile elements with obviously middle minus-Eu abnormity, indicating obviously fountainhead of crust resource. The U-Pb dating of zircon by Second Ion Microprobe revealed that the dike formed between 277 similar to 286Ma. Therefore, it was suggested that acidic dike swarm resulted from the partial melting of crustal material in regional extensional surrounding after the end of the Hercynian Altai orogenesis.
学科主题	火成岩岩石学
WOS关键词	A-TYPE GRANITOIDS ; CENTRAL-ASIA ; NW CHINA ; NORTHERN XINJIANG ; CONSTRAINTS ; SR ; ND ; GROWTH ; EVOLUTION ; ORIGIN
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000248135100003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38567]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China Geol & Min Bur Hubei, Geol Team NE Hubei, Xiaogan 432100, Peoples R China Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China Chinese Univ Geosci, Grad Sch, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Gong, HL ,Chen, ZL ,Hu, YQ ,et al. Geochemical characteristics of acidic dike swarm from the eastern segment of the Ertix tectonic belt, Altai orogeny and its geological implications[J]. ACTA PETROLOGICA SINICA,2007,23(5):889-899.
APA	Gong, HL .,Chen, ZL .,Hu, YQ .,Li, L .,Lai, XR .,...&Zhang, WG .(2007).Geochemical characteristics of acidic dike swarm from the eastern segment of the Ertix tectonic belt, Altai orogeny and its geological implications.ACTA PETROLOGICA SINICA,23(5),889-899.
MLA	Gong, HL ,et al."Geochemical characteristics of acidic dike swarm from the eastern segment of the Ertix tectonic belt, Altai orogeny and its geological implications".ACTA PETROLOGICA SINICA 23.5(2007):889-899.