The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction

doi:10.1016/j.jseaes.2009.10.006

	The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction
	Zhang, Hong-Fu 1; Zhou, Mei-Fu 2; Sun, Min 2; Zhou, Xin-Hua 1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2010-03-25
卷号	37 期号:5-6 页码:425-437
关键词	PGE Kimberlite Subducted oceanic slab-mantle interaction North China Craton
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2009.10.006
文献子类	Article
英文摘要	Concentrations of major, trace, and platinum-group element (PGE) compositions were determined for a suite of the Early Palaeozoic (ca. 465 Ma) Mengyin and Fuxian diamondiferous kimberlites from the eastern North China Craton to constrain the petrogenesis of these rocks and thus the mantle processes involved in their origin. Although the Chinese kimberlites are broadly similar to the kimberlites of South Africa (McDonald et al., 1995), there are significant compositional differences between the Mengyin and the Fuxian fields. The Mengyin kimberlites are more refractory (Mg# >87, Ni = 1207-1786, Cr = 1991 4224) and more strongly enriched in LREE ((La/Yb)(N) = 265-517), but have lower Pd/Ir ratios (1.26-2.08) than those of the Fuxian field. The Mengyin kimberlites possess primitive, mantle-like Sr-Nd isotopic ratios. These features suggest that the Mengyin kimberlites formed from a mixture of carbonated asthenosphere and lithospheric keel with a minor contribution from a previously subduction-dehydrated oceanic slab. In contrast, the Fuxian kimberlites are less refractory (Mg# = 80-87, Ni = 971-1411, Cr = 1483-2285), less enriched in LREE ((La/Yb)(N) = 45-173) and have higher Pd/Ir ratios (1.59-4.24). Their lower epsilon Nd values (epsilon Nd similar to -2.3) and large variations in Sr isotopic compositions suggest significant involvement of hydrothermally-altered and previously subduction-dehydrated oceanic lithosphere. Thus, we consider that the formation of the two kimberlites was related to the previously dehydrated subduction of an oceanic slab beneath the North China Craton in the Palaeozoic. The subduction of Palaeo-Tethyan oceanic lithosphere in the south and/or subduction of the Mongolian Ocean lithosphere in the north could have initiated the destabilization of the eastern North China Craton. Melts released from the previously dehydrated subducted slab migrated and concentrated in regions of thermally perturbed asthenosphere and at the base of lithosphere keel, which in turn triggered the generation of kimberlitic magmas by a small degree of melting of the carbonated asthenosphere and the lithosphere keel. (C) 2009 Elsevier Ltd. All rights reserved.
WOS关键词	PLATINUM-GROUP ELEMENTS ; LITHOSPHERIC MANTLE ; ENRICHMENT PROCESSES ; MINERAL INCLUSIONS ; TECTONIC EVOLUTION ; ISOTOPIC EVIDENCE ; MESOZOIC BASALTS ; PRECIOUS METALS ; INNER-MONGOLIA ; TRACE-ELEMENT
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000275289700003
资助机构	Chinese Academy of Sciences (Beirenjihua) ; Chinese Academy of Sciences (Beirenjihua) ; Natural Science Foundation of China(40721062 ; Natural Science Foundation of China(40721062 ; 90714008) ; 90714008) ; Chinese Academy of Sciences (Beirenjihua) ; Chinese Academy of Sciences (Beirenjihua) ; Natural Science Foundation of China(40721062 ; Natural Science Foundation of China(40721062 ; 90714008) ; 90714008) ; Chinese Academy of Sciences (Beirenjihua) ; Chinese Academy of Sciences (Beirenjihua) ; Natural Science Foundation of China(40721062 ; Natural Science Foundation of China(40721062 ; 90714008) ; 90714008) ; Chinese Academy of Sciences (Beirenjihua) ; Chinese Academy of Sciences (Beirenjihua) ; Natural Science Foundation of China(40721062 ; Natural Science Foundation of China(40721062 ; 90714008) ; 90714008)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72292]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Hong-Fu
作者单位	1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, 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, Hong-Fu,Zhou, Mei-Fu,Sun, Min,et al. The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction[J]. JOURNAL OF ASIAN EARTH SCIENCES,2010,37(5-6):425-437.
APA	Zhang, Hong-Fu,Zhou, Mei-Fu,Sun, Min,&Zhou, Xin-Hua.(2010).The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction.JOURNAL OF ASIAN EARTH SCIENCES,37(5-6),425-437.
MLA	Zhang, Hong-Fu,et al."The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction".JOURNAL OF ASIAN EARTH SCIENCES 37.5-6(2010):425-437.