Geochernical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications

doi:10.1016/j.lithos.2004.12.015

	Geochernical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications
	Zhang, HF ; Sun, M ; Zhou, XH ; Ying, JF
刊名	LITHOS
	2005-04-01
卷号	81 期号:1-4 页码:297-317
关键词	Mesozoic Alkaline Intrusive Complex Lithospheric Mantle North China Craton
ISSN号	0024-4937
DOI	10.1016/j.lithos.2004.12.015
文献子类	Article
英文摘要	Mesozoic alkaline intrusive complexes are widespread in the southern portion of the North China Craton and can provide some important constraints on the evolution of the Mesozoic lithosphere beneath the region. Three selected intrusive complexes (Tongshi, Hongshan, and Longbaoshan) are generally high in alkalis (K2O+Na2O=9-13 wt.%) and Al2O3 (14 similar to 21.6 wt.%) and low in CaO and TiO2 (< 0.6 wt.%), with high and variable SiO2 contents. Rocks from these complexes are all enriched in LREE and LILE (Cs, Rb, Ba, U, Th), depleted in Nb and Ti, have a highly positive Pb anomaly, and are characterized by lack of a clear Eu anomaly despite trace element abundances and isotopic ratios that vary greatly between complexes. The Tongshi complex has high Cs (2.6 similar to 8.5 ppm) and REE abundances (Sigma REE=112.6 similar to 297 ppm, (La/Yb)(N)=13.1 similar to 30.9) and MORB-like Sr-Nd-Pb isotopic ratios ((Sr-87/Sr-86)(i)< 0.704; epsilon(Nd)> 0; (Pb-206/Pb-204)(i)> 18). The Hongshan complex has low REE concentrations (EREE=28.2 similar to 118.7 ppm, (LaiYb)(N)=4.6 similar to 14.7) and is moderately enriched as demonstrated by their Sr-Nd isotopic ratios ((Sr-87/Sr-86)(i)> 0.706; epsilon(Nd)<-7). The Longbaoshan complex is extremely PEE enriched (Sigma REE=211.3 similar to 392.6 ppm, (La/Yb)N=32.4-60.9) and has an EM2-like Sr-Nd isotopic character ((Sr-87/Sr-86)(i)> 0.7078; epsilon(Nd)<-11). We suggest that the Tongshi complex originated from the asthenosphere and the Hongshan complex and the Longbaoshan complex were derived from the partial melting of previously subduction-modified lithospheric mantle, in response to post-collisional lithospheric extension and asthenospheric upwelling. The occurrence of these alkaline intrusive complexes demonstrates that the lithosphere beneath the region must have been considerably thinned at the time of intrusion of these complexes. This study also shed light on the temporal evolution of the Mesozoic lithosphere and the timing of the lithospheric thinning. (c) 2005 Elsevier B.V. All rights reserved.
WOS关键词	COESITE-BEARING ECLOGITES ; WESTERN SHANDONG PROVINCE ; SINO-KOREAN CRATON ; PB ISOTOPE ; LITHOSPHERIC MANTLE ; SM-ND ; METAMORPHIC ROCKS ; DABIE MOUNTAINS ; EASTERN CHINA ; TRACE-ELEMENT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000228418000014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/64818]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, HF
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Zhang, HF,Sun, M,Zhou, XH,et al. Geochernical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications[J]. LITHOS,2005,81(1-4):297-317.
APA	Zhang, HF,Sun, M,Zhou, XH,&Ying, JF.(2005).Geochernical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications.LITHOS,81(1-4),297-317.
MLA	Zhang, HF,et al."Geochernical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications".LITHOS 81.1-4(2005):297-317.