Iron and magnesium isotopic constraints on the origin of chemical heterogeneity in podiform chromitite from the Luobusa ophiolite, Tibet
文献类型：期刊论文
| 作者 | Zhu, B (Zhu, Bin)2; Shi, RD (Shi, Ren-Deng)1; Huang, QS (Huang, Qi-Shuai)1; Gong, XH (Gong, Xiao-Han)1; He, YS (He, Yong-Sheng)5; Xiao, Y; Xiao, Y (Xiao, Yan)2; Teng, FZ (Teng, Fang-Zhen)3; Su, BX (Su, Ben-Xun)2,3,4; Hu, Y (Hu, Yan)3 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2016 |
| 卷号 | 17期号:3页码:940-953 |
| 关键词 | North China Craton Melt-rock Interaction Southern Tibet Magmatic Differentiation Peridotite Xenoliths Mantle Xenoliths Ortho-pyroxene Lithospheric Mantle Oxygen Fugacity Eastern China |
| DOI | 10.1002/2015GC006223 |
| 文献子类 | Article |
| 英文摘要 | We present high-precision measurements of iron (Fe) and magnesium (Mg) isotopic compositions of olivine, orthopyroxene, and chromite separates from harzburgites, dunites, and chromitites in the mantle section of the Luobusa ophiolite, southern Tibet, to investigate the origins of podiform chromitite. Two harzburgites in the Zedong ophiolite, southern Tibet, are also reported for comparison. The olivine and orthopyroxene in the Luobusa and Zedong harzburgites have similar Fe and Mg isotopic compositions, with Fe-56 values ranging from 0 to +0.083 in olivine, from -0.034 to +0.081 in orthopyroxene and Mg-26 values ranging from -0.25 parts per thousand to -0.20 parts per thousand in olivine, from -0.29 parts per thousand to -0.26 parts per thousand in orthopyroxene, respectively. The olivines of two dunites from the Luobusa display small Fe and Mg isotopic variations, with Fe-56 values of +0.014 parts per thousand and +0.116 parts per thousand and Mg-26 values of -0.21 parts per thousand and -0.29 parts per thousand. All chromites in the Luobusa chromitites have lighter Fe isotopic compositions than the coexisting olivines, with Fe-56 values ranging from -0.247 parts per thousand to +0.043 parts per thousand in chromite and from -0.146 parts per thousand to +0.215 parts per thousand in olivine (Fe-56(Chr-Ol)=-0.294 to -0.101 parts per thousand). The chromite Mg-26 values span a significant range from -0.41 parts per thousand to +0.14 parts per thousand. Large disequilibrium Fe and Mg isotope fractionation between chromite and olivine, as well as positive correlation of chromite Fe-56 values with their MgO contents, could be attributed to Fe-Mg exchange between chromite and olivine. In the disseminated chromitites, the higher modal abundances of olivine than chromite would result in a more extensive Fe-Mg exchange, whereas chromite in the massive chromitite where olivine is rare could not be affected by this process. |
| 学科主题 | 地质学 |
| 语种 | 英语 |
| WOS记录号 | WOS:000375144700017 |
| 源URL | [http://ir.itpcas.ac.cn/handle/131C11/7740]  |
| 专题 | 青藏高原研究所_图书馆 |
| 通讯作者 | Xiao, Y |
| 作者单位 | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 3.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA 4.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, B ,Shi, RD ,Huang, QS ,et al. Iron and magnesium isotopic constraints on the origin of chemical heterogeneity in podiform chromitite from the Luobusa ophiolite, Tibet[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2016,17(3):940-953. |
| APA | Zhu, B .,Shi, RD .,Huang, QS .,Gong, XH .,He, YS .,...&Zhou, MF .(2016).Iron and magnesium isotopic constraints on the origin of chemical heterogeneity in podiform chromitite from the Luobusa ophiolite, Tibet.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,17(3),940-953. |
| MLA | Zhu, B ,et al."Iron and magnesium isotopic constraints on the origin of chemical heterogeneity in podiform chromitite from the Luobusa ophiolite, Tibet".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.3(2016):940-953. |
入库方式： OAI收割
来源：青藏高原研究所
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。