Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications.

	Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications.
	Qi, Z; Li, CD; Wang, Y; Wang, YL; Jin, WJ; Jia, XQ; Han, S; Jia XQ(贾秀琴); Han S(韩松)
刊名	ACTA PETROLOGICA SINICA
	2005
卷号	21 期号:6 页码:1527-1537
关键词	eastern China Late Mesozoic high-Sr and low-Yb granitoid adakite low-Sr and high-Yb granitoid geological implications
通讯作者	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China ; Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China ; Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
英文摘要	Late Mesozoic intermediate-acid granitoids are widespread in eastern China. They are basically distributed in three regions according to the geochemical characteristics: Northeastern China, North China and Southeastern China. Theoretically granitoids can be divided into five types based on their Sr and Yb contents: i.e., high-Sr and low-Yb type (Sr > 400 mu g/g, Yb < 2 mu g/g), low-Sr and low-Yb type (Sr < 400 mu g/g, Yb < 2 mu g/g), low-Sr and high-Yb type ( Sr < 400 mu g/g, Yb > 2 mu g/g), high-Sr and high-Yb type (Sr > 400 mu g/g, Yb > 2 mu g/g), and very low-Sr and very high-Yb type (Sr < 100 mu g/g, Yb = 2 similar to 18 mu g/g). The granitoids in NE China and SE China are mainly composed of low-Sr and high-Yb type with minor high-Sr and low-Yb type and very low-Sr and very high-Yb type, whereas the granitoids in North China consist mainly of high-Sr and low-Yb type with minor low-Sr and high-Yb type and low-Sr and low-Yb type and very low-Sr and very high-Yb type. Based on the geochemical characteristics of these granitoids, it is suggested here that the geochemical diversity of the granitoids in the North China and in the SE China is mainly caused by the composition and depth of the magma source and have a close correlation with the depth of the source. High-Sr and low-Yb type granitoids are derived from a magma source with eclogite composed of garnet + pyroxene + rutile +/- amphibole as a residual phase such that the evolved granitoids are highly depleted in HREE, Nb, Ta and Ti and enriched in Sr and Al without negative Eu anomalies, consistent with the characteristics of adakite. Low-Sr and high-Yb type granitoids are formed in a relatively shallow magma source where amphiolites or gneisses composed of plagioclase + pyroxene +/- amphiolite are the major residual phases. These differences indicate that the crust thickness of the North China and SE China is different in the late Mesozoic (late Jurassic to early Cretaceous) : the crust of the North China was thicker than that of the SE China. North China may have undergone delamination such that the chemical composition of the lower crust of the North China is different from that of the SE China: the average crustal composition of the North China is more felsic-rich than that of the SE China after the delamination of the lower crust of the North China with mafic components.
学科主题	Geology
类目[WOS]	Geology
研究领域[WOS]	Geology
原文出处	SCI
语种	英语
WOS记录号	WOS:000234692900002
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239403]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Qi, Z,Li, CD,Wang, Y,et al. Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications.[J]. ACTA PETROLOGICA SINICA,2005,21(6):1527-1537.
APA	Qi, Z.,Li, CD.,Wang, Y.,Wang, YL.,Jin, WJ.,...&韩松.(2005).Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications..ACTA PETROLOGICA SINICA,21(6),1527-1537.
MLA	Qi, Z,et al."Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications.".ACTA PETROLOGICA SINICA 21.6(2005):1527-1537.