International Journal of Earth Sciences

, Volume 98, Issue 6, pp 1299–1309 | Cite as

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

  • Wen Su
  • Ming Zhang
  • Simon A. T. Redfern
  • Jun Gao
  • Reiner Klemd
Original Paper

Abstract

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 M2+ 3 M3+ 2 T Si8(OH)2) in the cores, whereas the mantle to rim of the samples has an intermediate amphibole composition ( A 0.5 B Ca1.5Na0.5 C M 2+ 4.5 M 0.5 3+ T Si7.5Al0.5(OH)2) (A = Na and/or K; M 2+ = Mg and Fe2+; M 3+ = Fe3+ 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 FTIR/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)Mg3, M(1) M(3)Mg2Fe2+ and M(1) M(3) Fe2+ 3, 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 micro-chemical 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)□ (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.

Keywords

Zoned amphibole OH-stretching Infrared spectra Raman EMP Western Tianshan 

Notes

Acknowledgments

This work was supported by the NNSFC (No.40872059, 40572028), National Basic Research Program of China (No.2007CB411302 and 2009CB825001) and the Key Laboratory of Continental Dynamics in Northwest University. We are especially grateful to Dr. T. Zack, Dr. M. Gottschalk, Dr. G. Della Ventura and Dr. G. Iezzi for their constructive and helpful suggestions of this manuscript.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Wen Su
    • 1
    • 2
    • 3
  • Ming Zhang
    • 3
  • Simon A. T. Redfern
    • 3
  • Jun Gao
    • 1
  • Reiner Klemd
    • 4
  1. 1.Chinese Academy of SciencesState Key Laboratory of Lithospheric Evolution, Institute of Geology and GeophysicsBeijingChina
  2. 2.State Key Laboratory for Mineral Deposits ResearchNanjing UniversityNanjingChina
  3. 3.Department of Earth SciencesUniversity of CambridgeCambridgeUK
  4. 4.Institute of MineralogyWuerzburg UniversityWuerzburgGermany

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