Water in rutiles from UHP eclogites in the Dabie orogen
DOI:
CSTR:
Author:
Affiliation:

Clc Number:

P575.4; P588.3

Fund Project:

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    Intergranular rutiles from six UHP eclogites in the Dabie orogen were investigated by Micro-FTIR and EMP analysis. The results show that all grains show two strong absorbance bands at 3280 cm-1 and 3295 cm-1, withan occasional weak and wide absorbance band at ~3360 cm-1, which are all ascribed to structural OH. Comparisons with the results of HT-HP experiments indicate that the 3280 cm-1 band is caused by Ti3+ +H <—>Ti4+substitution, the 3295 cm-1 band is attributed to Fe3+ +H<—>Ti4+ substitution, and the ~3360 cm-1 band is possibly related to Mg2+ +2H<—>Ti4+. The calculated water contents (expressed as H2O wt.) based on two reliable IR absorbance coefficients are 161×10-6~854×10-6 and 202×10-6~1075×10-6respectively, and the results will increase by about 4~5 times if other absorbance coefficients are applied. Hence the relatively high water content in literature should be considered carefully. Similar to coexisting garnet and omphacite, heterogeneous distribution of water on the outcrop scales in rutiles implies a very limited fluid mobility during UHP metamorphism and a quick subduction and exhumation process. 

    Reference
    Related
    Cited by
Get Citation

盛英明 夏群科 郝艳涛,2007,大别山超高压榴辉岩中金红石的微量结构水[J].岩石矿物学杂志,26(3):269~274. SHENG Ying-ming, XIA Qun-ke, HAO Yan-tao,2007,Water in rutiles from UHP eclogites in the Dabie orogen[J]. Acta Petrologica et Mineralogica,26(3):269~274.

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:
  • Revised:September 12,2006
  • Adopted:
  • Online:
  • Published:
Article QR Code