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OH in zoned amphiboles of eclogite from the western Tianshan, NW-China

文献类型：期刊论文

作者Su, Wen1,2,3; Zhang, Ming3; Redfern, Simon A. T.3; Gao, Jun1; Klemd, Reiner4
刊名INTERNATIONAL JOURNAL OF EARTH SCIENCES
出版日期2009-09-01
卷号98期号:6页码:1299-1309
关键词Zoned amphibole OH-stretching Infrared spectra Raman EMP Western Tianshan
ISSN号1437-3254
DOI10.1007/s00531-008-0379-z
文献子类Article
英文摘要Chemically-zoned amphibole porphyroblast grains in an eclogite (sample ws24-7) from the western Tianshan (NW-China) have been analyzed by electron microprobe (EMP), micro Fourier-transform infrared (micro-FTIR) and micro-Raman spectroscopy in the OH-stretching region. The EMP data reveal zoned amphibole compositions clustering around two predominant compositions: a glaucophane end-member ((B)Na(2)(C)M(3)(2+) M(3)(2)(+)(T) Si(8)(OH)(2)) in the cores, whereas the mantle to rim of the samples has an intermediate amphibole composition ((A)(B)(0.5)Ca(1.5)Na(0.5)(C)M(4.5)(2+) M(0.5)(3+) (T)Si(7.5)Al(0.5)(OH)(2)) (A = Na and/or K; M(2+) = Mg and Fe(2+); M(2+) = Fe(2+) and/or Al) between winchite (and ferro-winchite) and katophorite (and Mg-katophorite). Furthermore, we observed complicated FTIR and Raman spectra with OH-stretching absorption bands varying systematically from core to rim. The FT-IR/Raman spectra of the core amphibole show three lower-frequency components (at 3,633, 3,649-3,651 and 3,660-3,663 cm(-1)) which can be attributed to a local O(3)-H dipole surrounded by (M(1) M(3))Mg(3), (M(1) M(3))Mg(2)Fe(2+) and (M(1) M(3))Fe(3)(2+), respectively, an empty A site and T Si8 environments. On the other hand, bands at higher frequencies (3,672-3,673, 3,691-3,697 and 3,708 cm(-1)) are observable in the rims of the amphiboles, and they indicate the presence of an occupied A site. The FTIR and Raman data from the OH-stretching region allow us to calculate the site occupancy of the A, M(1)-M(3), T sites with confidence when combined with EPM data. By contrast M(2)- and M(4) site occupancies are more difficult to evaluate. We use these samples to highlight on the opportunities and limitations of FTIR OH-stretching spectroscopy applied to natural high pressure amphibole phases. The much more detailed cation site occupancy of the zoned amphibole from the western Tianshan have been obtained by comparing data from microchemical and FTIR and/or Raman in the OH-stretching data. We find the following characteristic substitutions Si(T-site) (Mg, Fe)[ M(1)-M(3)-site] -> Al(T-site) Al[M(1)-M(3)-site] (tschermakite), Ca(M4-site)square (A-site) -> Na(M4-site) Na + K(A-site) (richterite), and Ca(M4-site) (Mg, Fe) [M(1)-M(3)-site] -> Na(M4-site) Al[M(1)-M(3)-site] (glaucophane) from the configurations observed during metamorphism.
WOS关键词RIETVELD STRUCTURE REFINEMENT ; SHORT-RANGE ORDER ; TRACE-ELEMENT ; FERRI-CLINOHOLMQUISTITE ; SYNTHETIC AMPHIBOLES ; CRYSTAL-CHEMISTRY ; INFRARED-SPECTROSCOPY ; POWDER-DIFFRACTION ; SODIC AMPHIBOLES ; PARGASITE JOIN
WOS研究方向Geology
语种英语
WOS记录号WOS:000269376400007
出版者SPRINGER
资助机构NNSFC(40872059 ; NNSFC(40872059 ; National Basic Research Program of China(2007CB411302 ; National Basic Research Program of China(2007CB411302 ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; 40572028) ; 40572028) ; 2009CB825001) ; 2009CB825001) ; NNSFC(40872059 ; NNSFC(40872059 ; National Basic Research Program of China(2007CB411302 ; National Basic Research Program of China(2007CB411302 ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; 40572028) ; 40572028) ; 2009CB825001) ; 2009CB825001) ; NNSFC(40872059 ; NNSFC(40872059 ; National Basic Research Program of China(2007CB411302 ; National Basic Research Program of China(2007CB411302 ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; 40572028) ; 40572028) ; 2009CB825001) ; 2009CB825001) ; NNSFC(40872059 ; NNSFC(40872059 ; National Basic Research Program of China(2007CB411302 ; National Basic Research Program of China(2007CB411302 ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; 40572028) ; 40572028) ; 2009CB825001) ; 2009CB825001)
源URL[http://ir.iggcas.ac.cn/handle/132A11/70408]  
专题中国科学院地质与地球物理研究所
通讯作者Su, Wen
作者单位1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210008, Peoples R China
3.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England
4.Univ Wurzburg, Inst Mineral, D-97074 Wurzburg, Germany
推荐引用方式
GB/T 7714		 Su, Wen,Zhang, Ming,Redfern, Simon A. T.,et al. OH in zoned amphiboles of eclogite from the western Tianshan, NW-China[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2009,98(6):1299-1309.
APA Su, Wen,Zhang, Ming,Redfern, Simon A. T.,Gao, Jun,&Klemd, Reiner.(2009).OH in zoned amphiboles of eclogite from the western Tianshan, NW-China.INTERNATIONAL JOURNAL OF EARTH SCIENCES,98(6),1299-1309.
MLA Su, Wen,et al."OH in zoned amphiboles of eclogite from the western Tianshan, NW-China".INTERNATIONAL JOURNAL OF EARTH SCIENCES 98.6(2009):1299-1309.

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来源：地质与地球物理研究所

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