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

文献类型：期刊论文

作者Zhang, Hong-Fu1; Zhou, Mei-Fu2; Sun, Min2; Zhou, Xin-Hua1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期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
DOI10.1016/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
WOS记录号WOS:000275289700003
出版者PERGAMON-ELSEVIER SCIENCE LTD
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)
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.

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来源：地质与地球物理研究所

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