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	Petrological, geochemical and chronological constraints for the origin and geological significance of neoarchean ttg gneiss in the songshan area, north china craton
	Zhou YanYan1,3; Zhao TaiPing1; Xue LiangWei2; Wang ShiYan4; Gao JianFeng5
刊名	Acta petrologica sinica
	2009-02-01
卷号	25期号:2页码:331-347
关键词	Neoarchean Ttg gneiss Geochemistry Geochronology North china craton
ISSN号	1000-0569
通讯作者	Zhou yanyan(llylz_b3@163.com)
英文摘要	Neoarchean ttg gneisses widely occurred in the songshan area, henan province. they mainly consist of granitoid and minor diorite, with a crystallization age of 2600 similar to 2500ma by zircon shrimp u-pb technique. the ttg gneisses are rich in sio2 (>67%) and na2o (3% to 7%), but have low k2o/na2o ratios and low feot and mgo contents. their a/nck ratios range from 0.97 to 1.21, consistent with tonalities to trondhjemite trend. the songshan ttg gneisses are geochemically similar to high-al ttg assemblage. the songshan ttg gneisses have low ree contents, with differentiated lree/hree patterns and no eu anomalies on the chondrite-normalized ree patterns. the songshan ttg have high sr (433 x 10(-6) on the average) and sr/y ratios (165 on the average) and low rb/sr ratios, and display negative nb, ta and ti anomalies on the primitive-mantle normalized trace element patterns. their nb/ta ratios are averaged to be about 14 and la/nb ratios are 7. these indicate that the songshan ttg may have formed in an island arc or a continent marginal arc. the whole rock nd isotopic compositions and zircon hf isotopic compositions indicate that the songshan ttg may originated from a juvenile crust derived from a depleted mantle at 2.6ga with minor assimilation of ancient crust, while the variable mg-# values of the songshan ttg indicate different degrees of contamination of mantle wedge. therefore, the songshan ttg gneiss may have formed by partial melting of a subducted basaltic slab with garnet and amphibolite left in the residual magmas. the emplacement of the songshan ttg indicates an ancient oceanic crust may have existed at 2.53 ga before the collisions of different micro-continents in north china craton.
WOS关键词	TRACE-ELEMENT GEOCHEMISTRY ; TRONDHJEMITE-GRANODIORITE TTG ; ARCHEAN CONTINENTAL-CRUST ; HF-ISOTOPE ; SUPERIOR PROVINCE ; EASTERN FINLAND ; IGNEOUS ZIRCON ; LU-HF ; MANTLE ; EVOLUTION
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000265945400008
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2405010
专题	中国科学院大学
通讯作者	Zhou YanYan
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Henan Sci Res Inst Land Resources, Zhengzhou 450053, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 4.Henan Inst Geol Survey, Zhengzhou 450001, Peoples R China 5.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Zhou YanYan,Zhao TaiPing,Xue LiangWei,et al. Petrological, geochemical and chronological constraints for the origin and geological significance of neoarchean ttg gneiss in the songshan area, north china craton[J]. Acta petrologica sinica,2009,25(2):331-347.
APA	Zhou YanYan,Zhao TaiPing,Xue LiangWei,Wang ShiYan,&Gao JianFeng.(2009).Petrological, geochemical and chronological constraints for the origin and geological significance of neoarchean ttg gneiss in the songshan area, north china craton.Acta petrologica sinica,25(2),331-347.
MLA	Zhou YanYan,et al."Petrological, geochemical and chronological constraints for the origin and geological significance of neoarchean ttg gneiss in the songshan area, north china craton".Acta petrologica sinica 25.2(2009):331-347.

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