Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton

doi:10.1016/j.epsl.2009.10.009

	Chondritic magnesium isotopic composition of the terrestrial mantle: A case study of peridotite xenoliths from the North China craton
	Yang, Wei 1,2,3; Teng, Fang-Zhen 2,3; Zhang, Hong-Fu 1
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	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.