globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.07.041
Scopus记录号: 2-s2.0-85051017801
论文题名:
High-temperature inter-mineral Cr isotope fractionation: A comparison of ionic model predictions and experimental investigations of mantle xenoliths from the North China Craton
作者: Shen J.; Qin L.; Fang Z.; Zhang Y.; Liu J.; Liu W.; Wang F.; Xiao Y.; Yu H.; Wei S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 499
起始页码: 278
结束页码: 290
语种: 英语
英文关键词: chromium isotope ; inter-mineral fractionation ; ionic model ; mantle xenolith ; XANES
Scopus关键词: Lithology ; Melting ; Radioactive tracers ; Silicate minerals ; X ray absorption ; Coordination environment ; Experimental investigations ; Ionic models ; Isotope fractionation ; Mantle xenoliths ; Peridotite xenoliths ; X-ray absorption near edge spectroscopy ; XANES ; Isotopes ; chromium ; experimental study ; geochemistry ; high temperature ; ionic composition ; isotopic fractionation ; partial melting ; prediction ; XANES spectroscopy ; xenolith ; China ; North China Block
英文摘要: Recent works have proposed that chromium (Cr) isotopes could be fractionated during peridotite partial melting and basaltic magma crystallization. However, until now, inter-mineral Cr isotope fractionation behavior for major mantle minerals has been poorly constrained. To investigate the mechanism and magnitude of equilibrium inter-mineral Cr isotope fractionation and to explore its implications for planetary mantle and crust lithology evolutions, we performed a systematic study of equilibrium Cr isotope fractionation between major mantle minerals by coupling theoretical ionic modeling with laboratory isotope analyses of natural samples and Cr valence determinations by X-ray absorption near edge spectroscopy (XANES). The ionic model considers both charges and coordination environments of Cr species in mantle minerals, which have proven to be critical factors affecting inter-mineral isotope fractionation. The ionic modeling results predict a general order of spinel (Spl) > pyroxene (Py) ≥ olivine (Ol) in 53Cr/52Cr. Systematic Cr isotope analyses of coexisting mantle minerals of seventeen peridotite xenoliths from Beiyan in the North China craton were performed. Chromium isotope results for different mineral pairs of lherzolites (e.g., Δ53CrSpl–Ol of 0.11‰ to 0.16‰, Δ53CrSpl–Py of 0.04‰ to 0.11‰ and Δ53CrPy–Ol of 0.05‰ to 0.10‰ at 870 °C to 970 °C), document measurable and systematic inter-mineral Cr isotope fractionation, in excellent agreement with the modeling results predicted with XANES-determined Cr2+/ΣCr values of the mineral separates. This fractionation order could essentially account for Cr isotope behaviors during partial melting and magmatic crystallization observed in terrestrial peridotites and lunar basalts. In contrast, we found that metasomatisms could influence Cr isotope compositions of minerals from Beiyan metasomatized clinopyroxene- (Cpx-) rich lherzolites and wehrlites by means of mineral–melt interaction and/or kinetic diffusion, leading to disequilibrium inter-mineral Cr isotope fractionation. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109712
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: CAS Key Laboratory of Crust–Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; National Synchrotron Radiation Laboratory, University of Science, Technology of China, Hefei, 230026, China; Ore Deposit and Exploration Centre (ODEC), School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, PO Box 9825, Beijing, 100029, China

Recommended Citation:
Shen J.,Qin L.,Fang Z.,et al. High-temperature inter-mineral Cr isotope fractionation: A comparison of ionic model predictions and experimental investigations of mantle xenoliths from the North China Craton[J]. Earth and Planetary Science Letters,2018-01-01,499
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