The distribution characteristics of structural water in nominally anhydrous minerals (NAMs) from Dabie mountains can provide important microscopic information on some aspects of the related fluid activities, mineral deformation, dynamical process of blocks subduction and exhumation. The NAMs such as jadeites, garnets, rutiles and quarts in ultra-high pressure (UHP) jadeite quartzites of Shuanghe and Bixiling areas from Dabie mountains were investigated by Fourier transform infrared spectroscopy (FTIR), the result of which indicates that NAMs contain hydrogen occurring as hydroxyl (OH-) or molecule H2O. It is found that the average structural water contents of the jadeites from the two areas are both close to 1000 × 10-6; the rutilezs are both above 2000 × 10-6; the quarts are both <4 × 10-6. The structural water contents of garnets from different grains in the same area arent uniform, while the water contents of UHP jadeite quartzites from the two areas both range from 900 × 10-6 to 1600 × 10-6.The results reveal that the water in crust or protolith can be transported into the earths depth through NAMs in the UHP metamorphic rocks during the formation of the HP UHP metamorphic rocks.
|Number of pages||8|
|Journal||Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences|
|Publication status||Published - Mar 2007|
- Dabie mountains
- Infrared spectroscopy
- The structural water
- Ultra-high pressure jadeite quartzites