中国科学院机构知识库网格系统: Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs

Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs

文献类型：期刊论文


作者	Wu, Yuanbao 1; Zhou, Guangyan 1; Gao, Shan 1; Liu, Xiaochun 2; Qin, Zhengwei 1; Wang, Hao3 ; Yang, Jianzhou 1; Yang, Saihong 3
刊名	PRECAMBRIAN RESEARCH
出版日期	2014-11-01
卷号	254 页码:73-86
关键词	Yangtze Craton TTG rocks Neoarcchean Douling complex Petrogenesis
ISSN号	0301-9268
DOI	10.1016/j.precamres.2014.08.004
文献子类	Article
英文摘要	The Yangtze Craton is one of the most important cratonic blocks in eastern Asia. However, its early evolution has not been well constrained yet, because of the poor exposure of Archean basement rocks. In this contribution, a combined study of zircon U-Pb age, Hf-O isotope compositions, as well as whole rock element compositions was carried out for gray gneiss rocks from the Douling complex in the northwestern part of the Yangtze Craton. Zircon U-Pb dating for two gneiss samples yielded weighted mean ages of 2509 21 and 2496+15 Ma. The gray gneisses have high SiO2 (63.64-73.74%), Na2O (3.66-6.21%), but low 1(20 (0.76-2.93%) contents, and belong to the trondhjemite, tonalite and granodiorite series rocks. They are characterized by enrichments of LILEs and LREEs, but notable depletions in Nb-Ta and Ti, as well as heavy REEs and Y. All the samples plot into the fields of typical Archean17G rocks in the (La/Yb)(N) vs. (MN and Sr/Y vs. Y diagrams. Therefore, the gray gneisses in the Douling complex are Neoarchean 17G rocks. The relatively high Nb/Ta and Zr/Sm ratios of 19.6-46.0 and 14.5-143.4 suggest their formation under eclogite-facies conditions. They have low sHf(t) values of -3.21 and -3.39 and Hf model ages of 3194 +/- 26 and 3205 +/- 24 Ma, indicating their derivation from ca. 3.2 Ga juvenile mafic rocks. Their delta O-18 values of 6.41 +/- 0.12 and 5.44+/- 0.12% suggest that surface rocks were differently recycled into their sources. Collectively, the 17G rocks in the Douling complex were generated by partial melting of thickened mafic crust rather than direct partial melting of oceanic crust in a convergent plate boundary. A compilation of available zircon U-Pb and Hf isotope compositions of the Yangtze Craton reveals that there are quite differences of Hf isotope compositions in Archean. The ca. 3.8-3.4 Ga zircons exhibit (r)values of -5.8 to 0.0. These chondritic to slightly enriched hafnium isotope compositions imply that their host rocks were formed by protracted intra-crustal reworking of ancient protoliths without juvenile input. By contrast, zircons with ages younger than ca. 3.2 Ga register both negative and positive 6t(t) values up to the depleted mantle, providing clear evidence for the addition of juvenile materials. These imply that the subduction-driven plate tectonics might have been operated since ca. 3.2 Ga in the Yangtze Craton. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	ZIRCON U-PB ; NORTH CHINA CRATON ; TRONDHJEMITE-GRANODIORITE TTG ; OXYGEN-ISOTOPE RATIOS ; GA CONTINENTAL-CRUST ; DABIE-SULU OROGEN ; SOUTH CHINA ; TECTONIC EVOLUTION ; SUPERIOR PROVINCE ; BILLION YEARS
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000343786400005
出版者	ELSEVIER SCIENCE BV
资助机构	National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173016 ; 41173016 ; 41173017) ; 41173017) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173016 ; 41173016 ; 41173017) ; 41173017) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173016 ; 41173016 ; 41173017) ; 41173017) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173016 ; 41173016 ; 41173017) ; 41173017)
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85493]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu, Yuanbao
作者单位	1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Geol Sci, Inst Geomech, Key Lab Paleomagnetismand Tecton Reconstruct Mini, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wu, Yuanbao,Zhou, Guangyan,Gao, Shan,et al. Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs[J]. PRECAMBRIAN RESEARCH,2014,254:73-86.
APA	Wu, Yuanbao.,Zhou, Guangyan.,Gao, Shan.,Liu, Xiaochun.,Qin, Zhengwei.,...&Yang, Saihong.(2014).Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs.PRECAMBRIAN RESEARCH,254,73-86.
MLA	Wu, Yuanbao,et al."Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs".PRECAMBRIAN RESEARCH 254(2014):73-86.

入库方式： OAI收割

来源：地质与地球物理研究所

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Petrogenesis of Neoarchean TG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs

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