Sources and petrogenesis of the Cenozoic alkali basalts in Hebi, eastern North China Craton: Geochemical and Sr-Nd-Hf isotopic evidence

	Sources and petrogenesis of the Cenozoic alkali basalts in Hebi, eastern North China Craton: Geochemical and Sr-Nd-Hf isotopic evidence
	Zhu YuSheng 1,2; Hou GuangShun 3; Yang JinHui 1
刊名	ACTA PETROLOGICA SINICA
	2012-12-01
卷号	28 期号:12 页码:4064-4076
关键词	Alkali basalt Geochemistry Mantle Lithosphere-asthenosphere interaction Hebi region in the North China Craton
ISSN号	1000-0569
文献子类	Article
英文摘要	Continental alkali basalts are the key to understand the nature of the subcontinental lithospheric mantle and the interaction among the crust, lithospheric mantle and asthenosphere. Cenozoic alkali basalts, located in the central North China Craton, are main components of Cenozoic basalt province in the North China Craton. Their source and petrogenesis would provide complement evidence for studying the modification of lithospheric mantle beneath the central North China Craton during Cenozoic. The Hebi basalts are basanites and alkali olivine basalts, belonging to alkaline rocks, with SiO2 contents of 45.0% similar to 47.8%, MgO concentrations of 7.3% similar to 8.5%, and Na2O + K2O abundances of 4.6% similar to 6.3%. They are enriched in light rare earth elements (REEs) with highly fractionated LREEs and HREEs ((La/Yb)(N) = 15.1 similar to 21.2). In primitive mantle-normalized spidergrams, all rocks have evident positive Nb and Ta anomalies without Eu anomalies. They are enriched in LILEs and HFSEs, with Nb/U ratios of 35 similar to 48, La/Nb ratios of 0.4 similar to 0.7, and Ba/Nb ratios of 3.6 similar to 11. They have depleted Sr-Nd-Hf isotopic compositions, with initial Sr-87/Sr-86 ratios of 0.7036 similar to 0.7044, epsilon(Nd)(t) values of +0.4 to +5.4 and epsilon(Hf)(t) values of +5.0 to +9.7. All these characteristics are similar to those of the oceanic island basalts (OIBs). All these geochemical features, combined with petrographic observations, suggest weak crustal contamination and fractional crystallization in their origin. It is concluded that the Hebi alkali basalts were derived from small degree partial melting of asthenospheric mantle at depths more than 80km, with interaction with lithospheric mantle.
WOS关键词	SINO-KOREAN CRATON ; LITHOSPHERIC MANTLE BENEATH ; TRACE-ELEMENT ; TAIHANG MOUNTAINS ; MASS-SPECTROMETRY ; VOLCANIC-ROCKS ; MAJOR-ELEMENT ; PB ISOTOPE ; LU-HF ; TECTONIC EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000313315700021
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84236]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhu YuSheng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Henan Polytech Univ, Inst Resources & Environm, Jiaozuo 454000, Peoples R China
推荐引用方式 GB/T 7714	Zhu YuSheng,Hou GuangShun,Yang JinHui. Sources and petrogenesis of the Cenozoic alkali basalts in Hebi, eastern North China Craton: Geochemical and Sr-Nd-Hf isotopic evidence[J]. ACTA PETROLOGICA SINICA,2012,28(12):4064-4076.
APA	Zhu YuSheng,Hou GuangShun,&Yang JinHui.(2012).Sources and petrogenesis of the Cenozoic alkali basalts in Hebi, eastern North China Craton: Geochemical and Sr-Nd-Hf isotopic evidence.ACTA PETROLOGICA SINICA,28(12),4064-4076.
MLA	Zhu YuSheng,et al."Sources and petrogenesis of the Cenozoic alkali basalts in Hebi, eastern North China Craton: Geochemical and Sr-Nd-Hf isotopic evidence".ACTA PETROLOGICA SINICA 28.12(2012):4064-4076.