ECONOMIC GEOLOGY ARTICLES

Chromium (Cr) Deposits

Important minerals : Types of chromite deposits :- Indian deposits :- Stratiform or Layered Chromite Associated with mafic/ ultramafic layered intrusions formed in calm environment (Precambrian) Podiform chromite Irregular geometry, found in disturbed environment, Phanerozoic in age Sukinda ultramafic complex, Orissa Stratified beds inclosed in a sequence of Dunite-peridotite Sithampundi chromite, Tamilnadu Stratiform deposit in

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Geophysical Methods (Summery)

Method Measured parameter Used physical property Suitable deposits type Seismic Travel time of reflected & refracted waves Density and Elastic modeVelocity and Acoustic Coal, Oil, Gas, Groundwater, Layered sedimentary basin, Ni- Cu- PGE in volcanic basal flows Gravity Gravity(Variation in earth’s gravitational field) Density contrast between the surrounding and host rock Massive sulfides, Chromite, Ni-Cu-

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Pathfinder elements of ore deposits (Geochemistry)

Type of deposits Pathfinder element Gold- Silver vein type, Gold- Silver- Cobalt- Copper- Zinc and complex sulfide ores As W- Be- Zn- Mo- Cu- Pb- Skarns,Sn- Ba veins B Cu- Pb- Zn- Silver & Complex sulfide deposits Hg, Zn Ba- Ag vein deposit, Porphyry Cu Mn Wolframite- Tin contact metamorphic deposits Mo Porphyry Cu, Barium-

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Petroleum

Petroleum is hydrocarbon, with minor amount of Nitrogen, Oxygen and Sulfur as impurities along with heavy metal. Source of petroleum is organic. It contains CH4 chains that are linked together to form long chains of more complex molecules. Petroleum occurs in the earth in combination of any of the many states like gas, liquid (crude

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