National Centre for Earth Science Studies

NCESS thin section laboratory consists of a complete range of equipment necessary for preparing thin glass slides of rock/mineral samples. The laboratory is equipped with automatic thin section preparation units from Buhler USA (Isomet 1000, Isomet 5000, PetroLap, PetroBond, PetroThin, PetroPol, Automet), Struers-Labpol, Section grinding machine (Geological Syndicate, Calcutta), rock cutting machines for both big block samples and smaller specimens, and mounting press. The laboratory has the capabilities to prepare thin sections (up to ~0.03 mm) from hard rocks, weathered materials, loose sand, silt etc. The facility is also well equipped to prepare polished sections for ore microscope study, microprobe work, fluid inclusion plates, and grain mounting. Routine works undertaken in the facility include preparation of normal (un-polished) and polished rock sections and grain mounts for petrographic studies and EPMA analysis and preparation of wafers for fluid inclusion studies. The standard operating procedure involves three steps; sectioning, grinding and polishing. In between each step the samples will be cleaned using Sonic Clean ultrasonicator.

For the preparation of finely powdered samples used for whole-rock major and trace element geochemical analysis, the facility has a Fritsch Pulverisette with Ni-Ch grinding set (Fritsch GmbH; Germany) attached with air compressor, Jaw Crusher (Insmart Systems) and Hydraulic crusher unit.

The mineral separation facility includes Holman-Wilfley wet shaking table, Exhaust fume hood for heavy liquid separation, Frantz magnetic barrier separator (LB-1) and Binocular microscope (Nikon) with a camera attachment. The laboratory routinely processes the separation of different accessory mineral phases such as zircon, monazite, rutile, baddeleyite etc. The separated minerals are mounted on epoxy discs, ground and polished for further analysis in NCESS Isotope Geochemistry Facility.

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The palaeomagnetism laboratory was built during 1989-1990 and is being upgraded with full financial assistance from grants of the Department of Science and Technology, Government of India. The laboratory is equipped with a spinner magnetometer (sensitivity 0.05 mA/m; long spin; MOLSPIN Ltd, UK), AF demangetiser (peak field 100 mT; MOLSPIN Ltd; UK), MMTD thermal demagnetiser (Magnetic measurements, UK). The laboratory also has low field hysterisis apparatus, High field hysterisis loop tracer, pulse field magnetometer (Arun Electronics Ltd; Bombay) to record rockmagnetic properties. The spinner magnetometer is interfaced to an IBM personnal computer. The laboratory is equipped, for field collection of samples, with two Pomeroy gasoline drills (ASC scientific; USA), diamond drill bits, oriented device, pump can for water cooling, Brunton compass and other accessories. Laboraratory drilling Unit (Bharat Diamond works Ltd; Bombay) is also available for drilling and preparing specimens for palaeomagnetic study.

NCESS Petrology laboratory is equipped with the latest research model microscopes like Zeiss trinocular polarising microscope- AxioVision; Leica binocular polarising microscope with Leica DFS 320 digital photographic system, Mechanical counting stage; Leica M205C Stereo binocular microscope with 20.5:1 zoom. These are in addition to a) Leica transmitted/reflected binocular petrographic microscope with MPS 60 photomicrographic system b) Zeiss transmitted/reflected binocular petrographic microscope, c) Zeiss monocular, polarizing microscopes. NCESS petrology laboratory caters to the needs of the various disciplines of Earth Science at NCESS and other Institutes and Universities for carrying out research in fundamental and applied aspects of igneous, sedimentary, metamorphic petrology.