Petrology, mineralogy and geochemistry of oxide minerals in polymict xenoliths from the Bultfontein kimberlites, South Africa: implication for low bulk-rock oxygen isotopic ratios
文献类型：期刊论文
| 作者 | Zhang, HF; Menzies, MA; Mattey, DP; Hinton, RW; Gurney, JJ |
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2001-06-01 |
| 卷号 | 141期号:3页码:367-379 |
| 关键词 | South Africa polymict xenolith oxide mineral ilmenite chemical zoning |
| ISSN号 | 0010-7999 |
| 文献子类 | Article |
| 英文摘要 | Polymict mantle xenoliths from the Bultfontein kimberlites, South Africa, contain abundant ilmenites (30% in BD2666, 15% in JJG1414. 3% each in BD2394 and BD344). These ilmenites occur as disrupted veins or layers, coarse discrete grains, small segregations interstitial to other silicate minerals, and tiny irregular grains disseminated in the subgrains of enstatites. The vein-like ilmenite usually shows a textural zonation across the vein, in rare cases along veins. This textural zonation is coincident with chemical and oxygen isotopic variations, with the margins being finer in grain sizes and richer in incompatible elements. The chemical and isotopic compositions also vary between different occurrences of ilmenite grains. In general, the smaller grains are richer in Cr, LREE and LILE and lighter in oxygen isotopes, Thus. chemical and oxygen isotopic disequilibria are well preserved in these ilmenites, which are also seen in the silicate minerals. These features suggest that ilmenites from the polymict xenoliths formed by magmatic and/or metasomatic processes. The invasion of the Fe-Ti-Cr-rich melt with low oxygen isotopic ratio can account for the observed low bulk oxygen isotopic ratios in the polymict xenoliths. This Fe Ti-rich melt with high ilmenite normative could be produced by melt immiscibility during the migration of an initially homogeneous high-Ti silicate melt. |
| WOS关键词 | UPPER MANTLE ; FRACTIONATION ; METASOMATISM ; TITANATES ; BEARING ; RUTILE |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000169538000009 |
| 出版者 | SPRINGER-VERLAG |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/76731]  |
| 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 3.Univ Edinburgh, Dept Geol & Geophys, Edinburgh EH9 3JW, Midlothian, Scotland 4.Univ Cape Town, Dept Geochem, ZA-7700 Rondebosch, South Africa |
| 推荐引用方式 GB/T 7714 | Zhang, HF,Menzies, MA,Mattey, DP,et al. Petrology, mineralogy and geochemistry of oxide minerals in polymict xenoliths from the Bultfontein kimberlites, South Africa: implication for low bulk-rock oxygen isotopic ratios[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2001,141(3):367-379. |
| APA | Zhang, HF,Menzies, MA,Mattey, DP,Hinton, RW,&Gurney, JJ.(2001).Petrology, mineralogy and geochemistry of oxide minerals in polymict xenoliths from the Bultfontein kimberlites, South Africa: implication for low bulk-rock oxygen isotopic ratios.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,141(3),367-379. |
| MLA | Zhang, HF,et al."Petrology, mineralogy and geochemistry of oxide minerals in polymict xenoliths from the Bultfontein kimberlites, South Africa: implication for low bulk-rock oxygen isotopic ratios".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 141.3(2001):367-379. |
入库方式： OAI收割
来源：地质与地球物理研究所
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