Formation age and tectonic environment of the Gantaohe Group, North;China Craton: Geology, geochemistry, SHRIMP zircon geochronology and;Hf-Nd isotopic systematics

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	Formation age and tectonic environment of the Gantaohe Group, North;China Craton: Geology, geochemistry, SHRIMP zircon geochronology and;Hf-Nd isotopic systematics
	Xie HangQiang 4; Liu DunYi ; Yin XiaoYan ; Zhou HongYing ; Yang ChongHui ; Du LiLin ; Wan YuSheng
刊名	CHINESE SCIENCE BULLETIN
	2012
卷号	57 期号:36 页码:4735-4745
关键词	Gantaohe Group SHRIMP zircon dating geochemistry Paleoproterozoic continental rift North China Craton Trans North China Orogen
ISSN号	058MI
英文摘要	The Gantaohe Group is an important early Precambrian unit in the Trans-North China Orogen, North China Craton, and is mainly composed of greenschist-facies metabasalt, meta-sandstone and dolomitic marble. We report whole-rock geochemical compositions and SHRIMP zircon ages as well as LA-ICP-MS Hf-in-zircon isotopeic analyses for metabasalts from the Gantaohe Group. SHRIMP dating yielded a weighted mean Pb-207/Pb-206 age of 2087 +/- 16 Ma (MSWD=1.3) for magmatic zircons, but there are also abundant ca. 2.5 Ga inherited zircon xenocrysts. The magmatic zircons shows a large E > (Hf)(t) variation in E > (Hf)(t) from -7.17 to +0.45, suggesting an isotopically highly heterogeneous source for the metabasalt. Chemically all samples show no distinct Zr or Hf anomalies, and some samples show no Nd or Ta anomalies in a primitive mantle-normalized trace element variation diagram, and their whole-rock E > (Nd)(t) values range from 4.0 to -0.8. We suggest that the basalt is formed by partial melting of a depleted mantle source, followed by significant crustal contamination. Field observations, the presence of abundant inherited zircon, as well as isotope and trace elements geochemistry support formation of the Gantaohe Group on top of a continental basement. These data and the regional geology lead us to conclude that the Trans-North China Orogen constituted an intracontinental rift during the Paleoproterozoic that was connected to the Eastern Block since the end of the Archean.
学科主题	构造地质学
WOS关键词	WUTAI MOUNTAINS AREA ; U-PB GEOCHRONOLOGY ; DETRITAL ZIRCONS ; HUTUO-GROUP ; ZHONGTIAO MOUNTAIN ; JIANGXIAN GROUP ; EVOLUTION ; CONSTRAINTS ; OROGEN ; COMPLEX
WOS研究方向	Multidisciplinary Sciences
语种	英语
出版者	We would like to thank Yuhai Zhang and Zhiqing Yang for help in SHRIMP;dating and Hua Tao, Qing Ye, Hui Zhou and Chun Yang for zircon mount;making and CL imaging. We are grateful to Prof. Guochun Zhao and the;other two anonymous reviewers for their valuable comments and;suggestions. This work was supported by the China Geological Survey;(1212010811033) and the National Basic Research Program of China;(2012CB416601).
WOS记录号	WOS:000312637600012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39755]
专题	中国地质调查局天津地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China. 3.China Geol Survey, Tianjin Inst Geol & Mineral Resources, Tianjin 200170, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Xie HangQiang,Liu DunYi,Yin XiaoYan,et al. Formation age and tectonic environment of the Gantaohe Group, North;China Craton: Geology, geochemistry, SHRIMP zircon geochronology and;Hf-Nd isotopic systematics[J]. CHINESE SCIENCE BULLETIN,2012,57(36):4735-4745.
APA	Xie HangQiang.,Liu DunYi.,Yin XiaoYan.,Zhou HongYing.,Yang ChongHui.,...&Wan YuSheng.(2012).Formation age and tectonic environment of the Gantaohe Group, North;China Craton: Geology, geochemistry, SHRIMP zircon geochronology and;Hf-Nd isotopic systematics.CHINESE SCIENCE BULLETIN,57(36),4735-4745.
MLA	Xie HangQiang,et al."Formation age and tectonic environment of the Gantaohe Group, North;China Craton: Geology, geochemistry, SHRIMP zircon geochronology and;Hf-Nd isotopic systematics".CHINESE SCIENCE BULLETIN 57.36(2012):4735-4745.