Dear Syed asim Hussain,

Fluid inclusions are archives of the fluid at the moment of crystal formation, and record the physical conditions and chemical composition of this fluid. In particular, their density is a function of the temperature of the fluid during crystal formation. The homogenization temperature provides this temperature of entrapment, provided that entrapment pressure is low and that no irreversible deformation of the fluid inclusions walls has occurred since the entrapment.

A fluid inclusion in a recrystallized crystal records information of the moment of recrystallization; for instance, homogenization temperature will be that of the fluid during recrystallization. Usually, recrystallization occurs long after the primary growth, and the recrystallization environment is therefore not representative of the primary environment; recrystallized fluid inclusions much more likely record diagenesis conditions.

This is why halite fluid inclusions must be exclusively primary in paleoclimate studies.

Dear Dr. Emmanuel Guillerm,

Thanks for your reply. I got it now.

Syed asim Hussain I agree with Emmanuel Guillerm , If you want to use recrystallized grains, keep in mind that it will only provide you information about the conditions of that time (recrystallization conditions). So, if you're interested in the PT conditions at that moment (time of recrystallization), go for it, but don't expect to get anything about the pre-recrystallization conditions (Primary crystallization).

Mohsin Raza thank you dear