Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block, western Yunnan

	Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block, western Yunnan
	Chen, FK ; Li, QL ; Wang, XL ; Li, XH
刊名	ACTA PETROLOGICA SINICA
	2006-02-01
卷号	22 期号:2 页码:439-448
关键词	Western Yunnan basement migmatitc zircon age Sr-Nd-Hf isotopes
ISSN号	1000-0569
文献子类	Article
英文摘要	The Tethyan belt in western Yunnan, being one of the important parts of the eastern Tethyan belt, is made up of several micro-continental blocks and orogenic belts in between. Provenance and evolution of basements within these blocks are rarely known due to limited exposure of the basements that were subjected to imprint of tectonic events. This study presents zircon age, geochemical composition and Sr-Nd-Hf isotopic characteristic of migmatite from the eastern part of the Tengehong block, to discussion the formation age and tectonic setting of the protolith. Protoliths of migmatite originated from Middle Proterozoic granodioritic to granitic material that was subjected to re-melting in late Mesozoic and probably later migmatitization. The analyzed rocks have depleted-mantle Nd modal ages of 1.9 to 1.5Ga and zircon Hf modal ages of 1.8 to 1.5Ga, different from those of the early Paleozoic and late Mesozoic granites exposed in the Baoshan block. Geochemically, they exhibit enrichment in light REEs, light-degree fractionation between middle and heavy REEs, significantly negative Eu-, Nb-, Ti-, Ba-, and Sr-anomaly. Initial epsilon(Nd) values (-1.7 to 3.5 at 1.0Ga) of whole-rocks and zircon initial epsilon(Hf) values (mean values 10.5 to 13.1 at 1.0Ga), combined within chemical feature, can imply that there was probably arc-related magmatism in the eastern part of the Tengchong block in middle Proterozoic.
WOS关键词	SOUTHWEST CHINA ; EVOLUTION ; PB ; ORTHOGNEISSES
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000236152700016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66960]
专题	中国科学院地质与地球物理研究所
通讯作者	Chen, FK
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Lab Radiogen Isotope Geochem, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Sch Earth Sci, Grad Coll, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Chen, FK,Li, QL,Wang, XL,et al. Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block, western Yunnan[J]. ACTA PETROLOGICA SINICA,2006,22(2):439-448.
APA	Chen, FK,Li, QL,Wang, XL,&Li, XH.(2006).Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block, western Yunnan.ACTA PETROLOGICA SINICA,22(2),439-448.
MLA	Chen, FK,et al."Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block, western Yunnan".ACTA PETROLOGICA SINICA 22.2(2006):439-448.