The evolution of the Central Yangtze Block during early Neoarchean time:;Evidence from geochronology and geochemistry

doi:10.1016/j.jseaes.2013.08.013

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	The evolution of the Central Yangtze Block during early Neoarchean time:;Evidence from geochronology and geochemistry
	Wang, Zhengjiang 1; Wang, Jian 1; Du, Qiuding 1; Deng, Qi 1,2; Yang, Fei 1,3
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	77;SI SI 页码:31-44
关键词	Yangpo Group A-type granite Yangtze craton Neoarchean Crustal basement
ISSN号	1367-9120;EI 1878-5786
DOI	10.1016/j.jseaes.2013.08.013
英文摘要	Although some Archean zircons (xenocrysts) have been reported in various places in the South China, Archean outcrops within the Yangtze Block have been spotted only in the Kongling terrain. Recently, the findings of a Neoarchean K-granite pluton emplaced within the Yangpo Group have opened a new window to study the formation and evolution of the Yangtze Block. We conducted a combined study of zircon U-Pb and whole-rock major and trace elements for seven quartz schist and two granite samples from the Yangpo Group in the Huji region, South China. It is another Archean outcrop in the Yangtze Block except for the Kongling terrain. Results of LA-ICP-MS dating for the detrital zircons from the quartz schist of the Yangpo Group indicate two age groups originating from two significant magmatic events at similar to 2.8 ca and similar to 3.05 Ga, as well as the similar to 2.9 Ga and similar to 3.2-3.3 Ga magmatism identified in a previous study. The quartz schists of the Yangpo Group show high SiO2 content and K2O/Na2O ratios, and low TiO2, Fe2O3, and MgO contents. Two granitic samples from the Yaozishan pluton display relatively high SiO2 and high alkali contents, low MgO, TiO2, and P2O5 content, and high A/KNC ratios (1.21-1.31), exhibiting an aluminous feature. At the same time, the two samples show positive anomalies of HFSE (Zr, Hf, Y) and LILE (Rb, U, Th, La), and high Rb/Sr and 10(4) x Ga/Al ratios. These geochemical observations are typical of A-type granites. The LA-ICP-MS dating results of the Jinshan and Yaozishan Granitic plutons further confirm the within-plate rifting and A-type granite emplacing event at 2.65 Ga. Compared with the Jinshan A-type granite, the Yaozishan A-type granite has a distinct feature of abnormally high 10(4) Ga/Al ratios (6.19-6.23) and lower zirconium saturation temperature (772-778 degrees C), which indicates that the Yaozishan A-type granite emplacing at similar to 2673 Ma be associated with an early episode of the plate rifting event in the middle Neoarchean. These results suggest that the Yangpo Group be developed from similar to 2.8 Ga to similar to 2.7 Ga, as filling sequence of a passive continental margin or intracratonic basin. Thus, our study reveals for the first time that the preliminary cratonization of the Central Yangtze Block ended similar to 2.8 Ga followed by the filling of the craton basin, plate collision at similar to 2.7 Ga, and post-collision rifting at similar to 2.65 Ga. (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	构造地质学
WOS关键词	NORTH CHINA CRATON ; ZIRCON U-PB ; A-TYPE GRANITES ; ARCHEAN CRUSTAL ; EVOLUTION ; HF-ISOTOPE EVIDENCE ; TRACE-ELEMENT CHARACTERISTICS ; GA ; CONTINENTAL-CRUST ; BACK-ARC BASIN ; LIAO-JI BELT ; SOUTH CHINA
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000326996800004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39978]
专题	中国地质调查局成都地质调查中心
作者单位	1.Minist Land & Resources, Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China. 2.Minist Land & Resources, Key Lab Sedimentary Basin & Oil & Gas Resources, Chengdu 610081, Peoples R China. 3.Chinese Acad Geol Sci, Grad Fac, Beijing 100037, Peoples R China. 4.Shandong Univ Sci & Technol, Grad Fac, Qingdao 266510, Peoples R China.
推荐引用方式 GB/T 7714	Wang, Zhengjiang,Wang, Jian,Du, Qiuding,et al. The evolution of the Central Yangtze Block during early Neoarchean time:;Evidence from geochronology and geochemistry[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,77;SI SI:31-44.
APA	Wang, Zhengjiang,Wang, Jian,Du, Qiuding,Deng, Qi,&Yang, Fei.(2013).The evolution of the Central Yangtze Block during early Neoarchean time:;Evidence from geochronology and geochemistry.JOURNAL OF ASIAN EARTH SCIENCES,77;SI SI,31-44.
MLA	Wang, Zhengjiang,et al."The evolution of the Central Yangtze Block during early Neoarchean time:;Evidence from geochronology and geochemistry".JOURNAL OF ASIAN EARTH SCIENCES 77;SI SI(2013):31-44.