Fluid inclusions

Many geological processes are dynamically linked to the presence and mobility of fluids. While these fluids can be studied indirectly using various petrological methods, we can examine geological fluids directly at the Fluid Inclusion Laboratory. Most minerals in nature have grown in the presence of a fluid: a liquid, a gas or a melt. Small quantities of this fluid can be trapped as inclusions during mineral growth. Fluid inclusions may be likened to small (commonly <50 µm) sealed containers in a mineral with relics of the fluid present during mineral growth or later recrystallization. Ever since their entrapment, the fluids have been imprisoned in the minerals.

Therefore, by carefully studying fluid inclusions, we can constrain directly the nature of fluids present during a wide range of geological processes.

The Fluid Inclusion Laboratory
Microthermometry: Analyses are carried out in the temperature range -180° to 600°C with a Linkam THM 600 heating and cooling stage mounted on a Nikon microscope utilising a 40x long working-distance objective. The sample is placed in the heating/cooling stage for detailed observations of phase changes in fluid inclusions as a function of temperature. These may be the disappearance or appearance of solid, liquid or gaseous phases. Microthermometry yields information about the temperature and composition of geological fluids.

Laser Raman microspectrometry: Analyses are performed using a laser Raman confocal spectrometer (Horiba instrument LabRAM HR 800) equipped with a multichannel air-cooled CCD detector. Both gaseous and solid phases present in fluid inclusions can be identified. Identification is based on the position, shape and intensity of characteristic peaks on a Raman spectrum. Peak characteristics reflect parameters such as molecular structure, bond strength and density.
A laser Raman confocal spectrometer, Horiba instrument LabRAM HR 800, equipped with a multichannel air cooled CCD detector at the department of geological sciences A laser Raman confocal spectrometer, Horiba instrument LabRAM HR 800, equipped with a multichannel air cooled CCD detector.
A The fluid inclusion laboratory at the department of geological sciences The fluid inclusion laboratory.
A microthermometric stage, Linkam THM 600, mounted on a Nikon microscope utilizing a 40X long working-distance objective at the department of geological sciences. A microthermometric stage, Linkam THM 600, mounted on a Nikon microscope utilizing a 40X long working-distance objective
For information and booking contact:
Curt Broman +46 (0)8 16 47 46
curt.broman[at]geo.su.se

 

 

 

 

 

Institutionen för geologiska vetenskaper
Svante Arrheniusväg 8, SE-106 91 Stockholm | Telefon: 08 16 20 00 | Webbadministratör ines.jakobsson[at]geo.su.se
Vid nödsituation ring (08) 16 22 16 or (08) 16 42 00