Fluid inclusion at a nano-scale to submicron-scale in quartz from jadeite quartzite at Shuanghe, Dabie Mountains, have been investigated using transmission electron microscopy (TEM). Most fluid inclusions are rounded or negative crystal shaped, forming wide, swarm-like trails, most inclusions ranging from 10 nm to 350 nm in size. TEM reveals that the relationship between coesite and the host quartz is syntaxy and provides strong evidence of the occurrence of high-salty fluids at peak metamorphic conditions. Fluid inclusions are often connected to dislocations, which are undetected at the scale of optical microscopy. No decrepitative leakage of fluid inclusions may occur by pipe diffusion of molecule H2O or CO2 along dislocations from the inclusions into the host quartz, thus leading to original inclusion density and composition changes. It should be taken into full account for the correct petrological interpretation of micro-thermometric results.
|Number of pages||4|
|Publication status||Published - Jun 2005|
- Dabie Mountains
- Nano-scale fluid inclusion
- UHP jadeite-quartzite