Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope

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	Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope
	Wan, YS (Wan, Yusheng); Liu, DY (Liu, Dunyi); Wilde, SA (Wilde, Simon A.); Cao, JJ (Cao, Jianjin); Chen, B (Chen, Bin); Dong, CY (Dong, Chunyan); Song, BA (Song, Biao); Du, LL (Du, Lilin)
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2010
卷号	37 期号:2 页码:140-153
关键词	Yunkai area South China SHRIMP U-Pb zircon dating Nd isotopes Palaeozoic (Caledonian) orogen Basement granitoids
ISSN号	1367-9120
英文摘要	The Yunkai Terrane is one of the most important pre-Devonian areas of metamorphosed supracrustal and granitic basement rocks in the Cathaysia Block of South China. The supracrustal rocks are mainly schist, slate and phyllite, with local paragneiss, granulite, amphibolite and marble, with metamorphic grades ranging from greenschist to granulite facies. Largely on the basis of metamorphic grade, they were previously divided into the Palaeo- to Mesoproterozoic Gaozhou Complex, the early Neoproterozoic Yunkai 'Group' and early Palaeozoic sediments. Granitic rocks were considered to be Meso- and Neoproterozoic, or early Palaeozoic in age. In this study, four meta-sedimentary rock samples, two each from the Yunkai 'Group' and Gaozhou Complex, together with three granite samples, record metamorphic and magmatic zircon ages of 443-430 Ma (Silurian), with many inherited and detrital zircons with the ages mainly ranging from 1.1 to 0.8 Ga, although zircons with Archaean and Palaeoproterozoic ages have also been identified in several of the samples. A high-grade sillimanite-garnet-cordierite gneiss contains similar to 242 Ma metamorphic zircons, as well as similar to 440 Ma ones. Three of the meta-sedimentary rocks show large variations in major element compositions, but have similar REE patterns, and have t(DM) model ages of 2.17-1.91 Ga and epsilon(Nd) (440 Ma) values of -13.4 to -10.0. Granites range in composition from monzogranite to syenogranite and record t(DM) model ages of 2.13-1.42 Ga and epsilon(Nd) (440 Ma) values of -8.4 to -1.2. It is concluded that the Yunkai 'Group' and Gaozhou Complex formed coevally in the late Neoproterozoic to early Palaeozoic, probably at the same time as weakly to un-metamorphosed early Palaeozoic sediments in the area. Based on the detrital zircon population, the source area contained Meso- to Neoproterozoic rocks, with some Archaean material. Palaeozoic tectonothermal events and zircon growth in the Yunkai Terrane can be correlated with events of similar age and character known throughout the Cathaysia Block. The lack of evidence for Palaeo- and Mesoproterozoic rocks at Yunkai, as stated in earlier publications, means that revision of the basement geology of Cathaysia is necessary. I (C) 2009 Elsevier Ltd. All rights reserved.
学科主题	地质年代学
WOS关键词	CATHAYSIA BLOCK ; SINGLE ZIRCON ; CORE COMPLEX ; GEOCHRONOLOGY ; ROCKS ; METAMORPHISM ; COLLISION ; GRANITE ; CRUST ; AGES
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000271837200004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39180]
专题	中国地质调查局
作者单位	Peking Univ, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wan, YS ,Liu, DY ,Wilde, SA ,et al. Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope[J]. JOURNAL OF ASIAN EARTH SCIENCES,2010,37(2):140-153.
APA	Wan, YS .,Liu, DY .,Wilde, SA .,Cao, JJ .,Chen, B .,...&Du, LL .(2010).Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope.JOURNAL OF ASIAN EARTH SCIENCES,37(2),140-153.
MLA	Wan, YS ,et al."Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope".JOURNAL OF ASIAN EARTH SCIENCES 37.2(2010):140-153.