Tectonic setting and mantle source characteristics of Jiugequan basalts, North Qilian: Contraints from trace elements and Nd-isotopes.

	Tectonic setting and mantle source characteristics of Jiugequan basalts, North Qilian: Contraints from trace elements and Nd-isotopes.
	Qian, Q ; Zhang, Q ; Sun, XM
刊名	ACTA PETROLOGICA SINICA
	2001-07-01
卷号	17 期号:3 页码:385-394
关键词	North Qilian mountains basalt trace element Nd-isotopes seamount
ISSN号	1000-0569
文献子类	Article
英文摘要	Basalts from Jiugequan ophiolite, North Qilian mountains, are of MORB-type, and are composed of N-MORBs in the lower section and E-MORBs in the upper section. Most of the basalts show negative Nb anomaly. From the bottom to the top, Th, Nb, LREE and Zr contents and (La/Yb)(N), (La/Sm)(N), Ce/Zr, Zr/Y, Th/La, Th/Yb ratios of the basalts are gradually increased, companioned with continuous descreasing of Y, Yb, Lu and Sc contents, Zr/Nb and La/Nb ratios, as well as epsilon (Nd)(t) In addition, the samples show significant correlations between incompatible element ratios and epsilon (Nd)(t), that is, incompatible elements and isotopes are coupled. We interpret these correlatios as mixing trends of N-MORB source and OIB source resulting from melting of a heterogeneous mantle domain. Trace elemental and Nd-isotopic characteristics indicate that the Jiugequan ophiolite was from a seamount in a back-are basin, and the geochemical variations records the motive geological processes that the seamount being gradually developed and moved away from the spreading ridge. It is proposed that many ophiolites were actually from seamounts.
WOS关键词	MID-ATLANTIC RIDGE ; EAST PACIFIC RISE ; GEOCHEMICAL VARIATIONS ; VOLCANIC-ROCKS ; SEAMOUNTS ; OPHIOLITE ; HETEROGENEITY ; PETROGENESIS ; EVOLUTION ; ORIGIN
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000170244300006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76635]
专题	中国科学院地质与地球物理研究所
通讯作者	Qian, Q
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Jilin Univ, Dept Geol, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Qian, Q,Zhang, Q,Sun, XM. Tectonic setting and mantle source characteristics of Jiugequan basalts, North Qilian: Contraints from trace elements and Nd-isotopes.[J]. ACTA PETROLOGICA SINICA,2001,17(3):385-394.
APA	Qian, Q,Zhang, Q,&Sun, XM.(2001).Tectonic setting and mantle source characteristics of Jiugequan basalts, North Qilian: Contraints from trace elements and Nd-isotopes..ACTA PETROLOGICA SINICA,17(3),385-394.
MLA	Qian, Q,et al."Tectonic setting and mantle source characteristics of Jiugequan basalts, North Qilian: Contraints from trace elements and Nd-isotopes.".ACTA PETROLOGICA SINICA 17.3(2001):385-394.