Mixed mantle provenance: diverse garnet compositions in polymict peridotites, Kaapvaal craton, South Africa
文献类型：期刊论文
| 作者 | Zhang, HF; Menzies, MA; Mattey, D |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2003-11-30 |
| 卷号 | 216期号:3页码:329-346 |
| 关键词 | Kaapvaal craton polymict peridotite garnet mantle provenance |
| ISSN号 | 0012-821X |
| DOI | 10.1016/S0012-821X(03)00487-4 |
| 文献子类 | Article |
| 英文摘要 | Garnet compositions are used to understand mantle petrogenesis and to reconstruct the lithostratigraphy of the shallow mantle (< 200 km). However, garnets in polymict peridotites from the Kaapvaal craton (> 2500 Ma) have a centimeter-scale elemental and stable isotopic variability suggestive of a mixed mantle provenance. The chemical heterogeneity of the garnets is similar to that reported from rocks sampled over a considerable depth and temperature range within the lower lithosphere. For example garnets found in polymict peridotites are similar to garnets found in sheared and granular peridotites, 'cold' and 'hot' lherzolites, peridotitic (P-type) diamond inclusions, and garnets from polybaric (50-200 km) peridotites (i.e. spinel, garnet and diamond facies). These data indicate that the Kaapvaal cratonic root has been disturbed by complex processes possibly associated with crack propagation and entrainment that juxtaposed garnet-bearing lithologies of diverse petrogenesis, provenance and depth. This has preserved chemical disequilibrium in the high pressure minerals in what is, in effect, a mantle breccia possibly associated with kimberlite precursors. (C) 2003 Elsevier B.V. All rights reserved. |
| WOS关键词 | RARE-EARTH ELEMENTS ; OXYGEN-ISOTOPE COMPOSITION ; TRACE-ELEMENTS ; LITHOSPHERIC MANTLE ; GEOCHEMICAL EVIDENCE ; LHERZOLITE NODULES ; DIAMOND FORMATION ; PYROPE GARNETS ; MIR KIMBERLITE ; INCLUSIONS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000186805700008 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79159]  |
| 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, Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 2.Univ London, Royal Holloway & Bedford New Coll, Dept Geol, Egham TW20 0EX, Surrey, England |
| 推荐引用方式 GB/T 7714 | Zhang, HF,Menzies, MA,Mattey, D. Mixed mantle provenance: diverse garnet compositions in polymict peridotites, Kaapvaal craton, South Africa[J]. EARTH AND PLANETARY SCIENCE LETTERS,2003,216(3):329-346. |
| APA | Zhang, HF,Menzies, MA,&Mattey, D.(2003).Mixed mantle provenance: diverse garnet compositions in polymict peridotites, Kaapvaal craton, South Africa.EARTH AND PLANETARY SCIENCE LETTERS,216(3),329-346. |
| MLA | Zhang, HF,et al."Mixed mantle provenance: diverse garnet compositions in polymict peridotites, Kaapvaal craton, South Africa".EARTH AND PLANETARY SCIENCE LETTERS 216.3(2003):329-346. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
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。