GATE 2017-2018 :: GATE Geology and Geophysics
- A sandstone bed dipping 30° has an outcrop width of 20 m in a flat terrain. What is the true thickness (in m) of the bed?
- Calculate the concentration (in ppm) of Ni in olivine that crystallizes from a basaltic magma containing 20 ppm Ni. The partition coefficient (solid/melt) of nickel is 5.
- An analysis of augite yields 3 silicon atoms calculated on the basis of 12 oxygen atoms. If only Al replaces Si, calculate the number of tetrahedral-Al in the mineral.
- Ca-montmorillonite is formed by the chemical weathering of
- In which of the following crystal systems, the characteristic symmetry elements "a two-fold axis of rotation and at least two planes of symmetry are possible?
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Determine the correctness or otherwise of the following Assertion [a] and Reason [r]. Assertion: Biaxial minerals can be pleochroic in three shades.Reason: Biaxial minerals have three refractive indices.
- The correct sequence of metamorphic facies with increasing depth in a subduction zone is
- Which one of the following basins is producing petroleum from the coal-rich reservoir rocks?
- A major thrust in the Himalayas has resulted in intense shearing of a zone about 0.5 km wide on either side of the thrust leading to landslides. Which GIS function can be used to display the shear zone?
- Vertical exaggeration commonly occurs during stereo-viewing of aerial photographs. Where does it occur?
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