The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction | |
Zhang, Hong-Fu1; Zhou, Mei-Fu2; Sun, Min2; Zhou, Xin-Hua1 | |
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/132A11/72294] ![]() |
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. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论