Thin section and sample preparation laboratory (TSL)
Thin section making facility for preparing thin glass slides of rock/mineral samples at CESS was a manual facility procured in the early eighties. It is now upgraded with addition of equipments from the Department of Science and Technology (Govt of India), Ministry of Earth Sciences, Govt of India and Plan funds of the NCESS. Laboratory is equipped with Automatic thin section preparation units from Buhler USA (Isomet 1000, PetroLap, PetroBond, PetroThin and PetroPol), Section grinding Machine (Geological Syndicate, Calcutta), Rock Cutting Machines for both big block samples and smaller specimens and three disc polishing machine, Automatic Wirtz Vibrating Grinder and Polisher (M/S Jean Wirtz, Germany), Mounting press etc.
The laboratory has the capabilities to prepare thin sections (upto ~0.03 mm) from hard rocks, weathered materials, loose sand, silt etc. Facility is also well equipped to prepare polished sections for ore microscope study, microprobe work, fluid inclusion plates, grain mounting etc.
Routine works undertaken in the facility include
- preparation of normal (un-polished) and polished rock sections and grain mounts for petrographic studies and for EPMA analysis
- preparation of wafers for fluid inclusion studies
- Preparation of special thin sections, for ex., coral, tooth etc.
Standard operating procedure involves three steps; sectioning, grinding and polishing. In between each steps the samples will be cleaned using SonicClean Ultrasonicator.
In addition, facility of Fritsch Pulverisette with Ni-Ch grinding set (Fritsch GmbH; Germany) attached with air compressor and a Jaw Crusher (Insmart Systems) are available for preparing samples for geochemical work.
The Group Head, CrP