Delineation of the ca. 2.7Ga TTG gneisses in the Fuping Complex, North China Craton and its geological significance

	Delineation of the ca. 2.7Ga TTG gneisses in the Fuping Complex, North China Craton and its geological significance
	Lu ZengLong 2; Song HuiXia ; Du LiLin ; Ren LiuDong ; Geng YuanSheng ; Yang ChongHui
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:10 页码:2872-2884
关键词	TTG gneisses 2.7Ga Greenstone belt Fuping Complex North China Craton
ISSN号	1000-0569
英文摘要	Through detailed field geological survey and indoor analysis we have delineated a suite of banded TTG gneisses from the Fuping Complex, North China Craton (NCC). The protolith of the gneisses was predominantly tonalite that has undergone intensive metamorphism, deformation and anatexis. The gneiss can be divided into the main rock body and strips. It extents three kinds of stripes: Tiny dark stripes, light stripes, late poured felsic stripes. The zircon LA-MC-ICPMS U-Pb data shows that the tonalite was formed ca. 2669. 2 +/- 9. 7Ma ago. The tonalite is featured with high silicon (SiO2 = 64. 32% similar to 70. 02%), high alumina (Al2O3 = 14.00% similar to 15. 87%), rich in sodic (Na2O = 3. 85% similar to 4. 22%), poor in potassium (K2O = 1. 13% similar to 2. 42%) with a low K/Na ratio. The Mg index is relatively high (Mg-# approximate to 39.5 similar to 49. 6). The gneiss is moderately-strongly fractioned in REE [(La/Yb)(N) = 3. 67 similar to 51.38]. Eu abnormality is not evident. It is enriched in LILE such as Sr (303 x 10 (-6) similar to 431 x 10(-6)), Ba (191 x 10(-6) similar to 696 x 10(-6)) and depleted in HFSE like Nb (4. 70 x 10(-6) similar to 9. 78 x 10(-6) Ta (0.19 x 10(-6) similar to 0.75 x 10(-6)), Ti (1378 x 10(-6) similar to 3295 x 10(-6)), P (174.6 x 10(-6) similar to 960.6 x 10(-6)), low contents of Yb (0.31 x 10(-6) similar to 1.75 x 10(-6)) and Y (3.61 x 10(-6) similar to 8.9 x 10(-6)) with high Sr/Y ratio (16. 0 similar to 119. 1). The contents of compatible elements [Cr (5. 9 x 10(-6) similar to 119 x 10(-6)) and Ni (6. 72 x 10(-6) similar to 45. 8 x 10(-6)) are relatively low. From the above, the gneiss is classified into high-Al TTG series, and has the similar characteristics with high-Si adakite. It is considered to be generated from the partial melting of hot Archean juvenile subducted oceanic crust. The delineation of this ca. 2. 7Ga TTG gneiss in the Fuping Complex further proves that the North China Craton experienced large-scale continental crustal accretion in Early Neoarchean, and gives new constraints on the contrast of time and scale of the magmatic events between the worldwide ones and the NCC. It also provides the subdivision of the early blocks and greenstone belts of the NCC.
学科主题	变质岩岩石学
WOS关键词	PB ZIRCON GEOCHRONOLOGY ; PRECAMBRIAN CONTINENTAL-CRUST ; TRACE-ELEMENT GEOCHEMISTRY ; U-PB ; ARCHEAN TRONDHJEMITES ; TECTONIC EVOLUTION ; GRANITIC GNEISSES ; ISOTOPE ANALYSIS ; ADAKITIC MAGMAS ; CENTRAL ZONE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000344215200007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40476]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Lu ZengLong,Song HuiXia,Du LiLin,et al. Delineation of the ca. 2.7Ga TTG gneisses in the Fuping Complex, North China Craton and its geological significance[J]. ACTA PETROLOGICA SINICA,2014,30(10):2872-2884.
APA	Lu ZengLong,Song HuiXia,Du LiLin,Ren LiuDong,Geng YuanSheng,&Yang ChongHui.(2014).Delineation of the ca. 2.7Ga TTG gneisses in the Fuping Complex, North China Craton and its geological significance.ACTA PETROLOGICA SINICA,30(10),2872-2884.
MLA	Lu ZengLong,et al."Delineation of the ca. 2.7Ga TTG gneisses in the Fuping Complex, North China Craton and its geological significance".ACTA PETROLOGICA SINICA 30.10(2014):2872-2884.