The nominally anhydrous minerals (NAMs) such as garnets and omphacites in Ultrahigh pressure eclogites in the Shima and Yingshan areas from Dabie Mountains were investigated by Fourier transform infrared spectroscopy (FTIR). It reveals that the NAMs could contain hydrogen occurring as hydroxyl (OH) or molecule H2O. It was found that the water contents are not uniform in the NAMs from different areas, and from the different grains at the same area to the different position in the same grain. the structural water contents of the omphacites at Shima and Yingshan are varied from 90 × 10-6-1 670 × 10-6 and from 110 × 10-6-710 × 10-6 respectively; while the garnets are from 510 × 10-6-830 × 10-6 and 0-180 × 10-6 respectively. The influence of structural water on the eclogites deformation and the relationship between structural water and fluid inclusions in NAMs are initially discussed in association with the related research result of former academicians.
|Number of pages||6|
|Publication status||Published - Jun 2006|
- Dabie Mountains
- Infrared spectroscopy
- Structural water