Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton | |
Yang, Wei1,2,3; Teng, Fang-Zhen2,3; Zhang, Hong-Fu1 | |
刊名 | EARTH AND PLANETARY SCIENCE LETTERS
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2009-11-15 | |
卷号 | 288期号:3-4页码:475-482 |
关键词 | magnesium isotopes terrestrial mantle peridotite olivine pyroxene the North China craton |
ISSN号 | 0012-821X |
DOI | 10.1016/j.epsl.2009.10.009 |
文献子类 | Article |
英文摘要 | In order to further investigate inter-mineral Mg isotope fractionation at mantle temperatures and to better constrain the Mg isotopic composition of the terrestrial mantle, we have studied a set of well-characterized mantle peridotite xenoliths from Sanyitang and Beiyan, North China craton. The Sanyitang and Beiyan peridotites, which have diverse origins with different mineralogy, chemical composition and degree of partial melting and metasomatism, display a small variation in Mg isotopic composition, with delta(26)Mg varying from -0.48 to -0.12 and an average value of -0.29 +/- 0.19 (2SD, n =21) in olivines, from -0.27 to -0.10 and an average value of -0.21 +/- 0.09 (2SD, n = 12) in orthopyroxenes and from -0.35 to -0.08 and an average value of -0.22 +/- 0.14 (2SD, n = 15) in clinopyroxenes. The Mg isotopic compositions of the coexisting olivine, orthopyroxene and clinopyroxene in all peridotites are identical within our external precision (similar to +/- 0.1 parts per thousand, 2SD), suggesting that Mg isotope fractionation between olivine and pyroxenes at the temperatures of >900 degrees C is insignificant. These results are thus consistent with the absence of Mg isotope fractionation during basalt differentiation. The similar to 0.4 parts per thousand Mg isotopic variations in these peridotite samples, which are larger than our external precision, might result from thermal diffusion-cl riven isotope fractionation or melt-rock interactions. |
WOS关键词 | SINO-KOREAN CRATON ; LITHOSPHERIC MANTLE ; ICP-MS ; BENEATH ; EVOLUTION ; FRACTIONATION ; GEOCHEMISTRY ; BASALTS ; MG ; METASOMATISM |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000273150900013 |
资助机构 | National Science Foundation of China(90714008 ; National Science Foundation of China(90714008 ; 40534022 ; 40534022 ; EAR-0838227) ; EAR-0838227) ; National Science Foundation of China(90714008 ; National Science Foundation of China(90714008 ; 40534022 ; 40534022 ; EAR-0838227) ; EAR-0838227) ; National Science Foundation of China(90714008 ; National Science Foundation of China(90714008 ; 40534022 ; 40534022 ; EAR-0838227) ; EAR-0838227) ; National Science Foundation of China(90714008 ; National Science Foundation of China(90714008 ; 40534022 ; 40534022 ; EAR-0838227) ; EAR-0838227) |
内容类型 | 期刊论文 |
源URL | [http://ir.iggcas.ac.cn/handle/132A11/70768] ![]() |
专题 | 中国科学院地质与地球物理研究所 |
通讯作者 | Yang, Wei |
作者单位 | 1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 10029, Peoples R China 2.Univ Arkansas, Isotope Lab, Dept Geosci, Fayetteville, AR 72701 USA 3.Univ Arkansas, Arkansas Ctr Space & Planetary Sci, Fayetteville, AR 72701 USA |
推荐引用方式 GB/T 7714 | Yang, Wei,Teng, Fang-Zhen,Zhang, Hong-Fu. Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton[J]. EARTH AND PLANETARY SCIENCE LETTERS,2009,288(3-4):475-482. |
APA | Yang, Wei,Teng, Fang-Zhen,&Zhang, Hong-Fu.(2009).Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton.EARTH AND PLANETARY SCIENCE LETTERS,288(3-4),475-482. |
MLA | Yang, Wei,et al."Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton".EARTH AND PLANETARY SCIENCE LETTERS 288.3-4(2009):475-482. |
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