Geochemical characteristics of eclogites in Xitieshan area, North Qaidam;of northwestern China

	Geochemical characteristics of eclogites in Xitieshan area, North Qaidam;of northwestern China
	Meng, FC; Zhang, JX; Yang, JS; Xu, ZQ
刊名	ACTA PETROLOGICA SINICA
	2003
卷号	19 期号:3 页码:435-442
关键词	North Qaidam eclogite geochemical characteristics
ISSN号	1000-0569
英文摘要	Eclogites occur as lenses in gneisses in Xitieshan area, Northern Qaidam. They indicate a whole-rock chemical composition similar to tholeiite with SiO2 = 45.0% similar to 49. 83% and Al2O3 = 11. 3% - 16. 52%. REE patterns of eclogites include three types: (1) REE-enriched pattern with (La/Yb)(N) = 1. 74 similar to 2. 81 and delta(Eu) = 0. 86 similar to 1. 07, indicating the characteristics similar to E-MORB; (2) flat pattern with (La/Yb)(N) = 0. 80 similar to 1. 22 and delta(Eu) = 0. 96 similar to 1. 20, similar to T-MORB; (3) LREE depletion pattern with ( La/Yb)(N) = 0. 66 and delta(Eu) = 1. 03, similar to N-MORB. Eclogites show light enrichment in Rb, Ba, Th, and can be related to crustal contamination. Nd isotopic analyses gave epsilon(Nd) (0) = 2. 52 similar to 10. 98, epsilon(Nd) (800Ma) = 3. 05 similar to 9. 20., indicating characteristics of an oceanic depleted mantle reservoir. Therefore, we tentatively suggest that the eclogites probably resulted from subduction of oceanic crust. This is obviously different from eclogite of Dabie-Sulu area.
学科主题	变质岩岩石学
WOS关键词	HIGH-GRADE METAMORPHISM ; SM-ND ; RB-SR ; U-PB ; REE ; GEOCHRONOLOGY ; PETROLOGY ; ISOTOPE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000187675100007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37581]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Geol, Lab Continental Dynam, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Meng, FC,Zhang, JX,Yang, JS,et al. Geochemical characteristics of eclogites in Xitieshan area, North Qaidam;of northwestern China[J]. ACTA PETROLOGICA SINICA,2003,19(3):435-442.
APA	Meng, FC,Zhang, JX,Yang, JS,&Xu, ZQ.(2003).Geochemical characteristics of eclogites in Xitieshan area, North Qaidam;of northwestern China.ACTA PETROLOGICA SINICA,19(3),435-442.
MLA	Meng, FC,et al."Geochemical characteristics of eclogites in Xitieshan area, North Qaidam;of northwestern China".ACTA PETROLOGICA SINICA 19.3(2003):435-442.