Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China
文献类型：期刊论文
| 作者 | Giuliani, Gaston1,2; Pivin, Marjorie4; Fallick, Anthony E.4; Ohnenstetter, Daniel2; Song, Yucai5; Demaiffe, Daniel3 |
| 刊名 | COMPTES RENDUS GEOSCIENCE
 |
| 出版日期 | 2015 |
| 卷号 | 347期号:1页码:24-34 |
| 关键词 | Oxygen isotopes Chemistry Corundum Kimberlite Alkali basalt Origin Mantle |
| DOI | 10.1016/j.crte.2014.12.003 |
| 文献子类 | Article |
| 英文摘要 | Oxygen isotope signatures of ruby and sapphire megacrysts, combined with trace-element analysis, from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China, provide clues to specify their origin in the deep Earth. At Mbuji-Mayi, pink sapphires have 8180 values in the range 4.3 to 5.4 parts per thousand (N=10) with a mean of 4.9 +/- 0.4 parts per thousand, and rubies from 5.5 to 5.6 parts per thousand (N=3). The Ga/Mg ratio of pink sapphires is between 1.9 and 3.9, and in rubies, between 0.6 and 2.6. The blue or yellow sapphires from Changle have delta O-18 values from 4.6 to 5.2 parts per thousand, with a mean of 4.9 +/- 0.2 parts per thousand (N=9). The Ga/Mg ratio is between 5.7 and 11.3. The homogenous isotopic composition of ruby suggests a derivation from upper mantle xenoliths (garnet lherzolite, pyroxenite) or metagabbros and/or lower crustal garnet clinopyroxenite eclogite-type xenoliths included in kimberlites. Data from the pink sapphires from Mbuji-Mayi suggest a mantle origin, but different probable protoliths: either subducted oceanic protolith transformed into eclogite with delta O-18 values buffered to the mantle value, or clinopyroxenite protoliths in peridotite. The Changle sapphires have a mantle O-isotope signature. They probably formed in syenitic magmas produced by low degree partial melting of a spinel Iherzolite source. The kimberlite and the alkali basalt acted as gem conveyors from the upper mantle up to the surface. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
| WOS关键词 | GEM-CORUNDUM ; MINERAL INCLUSIONS ; SOUTH-AFRICA ; ORIGIN ; XENOLITHS ; SAPPHIRES ; FIELDS ; DIAMONDS ; RUBIES ; RUBY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000353428100004 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62599]  |
| 专题 | 地质与地球物理研究所_其他部门 |
| 作者单位 | 1.Univ Toulouse 3, GET UMR CNRS IRD CNES 5563, F-31400 Toulouse, France 2.Univ Lorraine, CNRS, CRPG UMR 7358, F-54501 Vandoeuvre Les Nancy, France 3.ULB, DSTE, B-1050 Brussels, Belgium 4.SUERC, Isotope Geosci Unit, Glasgow G75 0QF, Lanark, Scotland 5.Chinese Acad Sci, Inst Geol, Beijing 100037, Peoples R China |
| 推荐引用方式 GB/T 7714 | Giuliani, Gaston,Pivin, Marjorie,Fallick, Anthony E.,et al. Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China[J]. COMPTES RENDUS GEOSCIENCE,2015,347(1):24-34. |
| APA | Giuliani, Gaston,Pivin, Marjorie,Fallick, Anthony E.,Ohnenstetter, Daniel,Song, Yucai,&Demaiffe, Daniel.(2015).Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China.COMPTES RENDUS GEOSCIENCE,347(1),24-34. |
| MLA | Giuliani, Gaston,et al."Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China".COMPTES RENDUS GEOSCIENCE 347.1(2015):24-34. |
入库方式： OAI收割
来源：地质与地球物理研究所
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