Section A
Q1. Describe the following in brief with diagrams and suitable examples, wherever necessary :
(a) Draw stereogram for crystal class 2 (Sphenoidal class).
(b) Name the members of plagioclase feldspar series and their composition ranges.
(c) Rubidium-Strontium geochronology.
(d) Compatible and incompatible trace elements.
(e) Crystal settling in magma chamber.
(f) Distinguish between S-type and I-type granites.
(g) Pressure solution.
(h) Two-feldspar thermometer.
(i) Give mineralogical and phase transformation changes at upper mantle transition zone - 410 km discontinuity.
(j) Draw a neat diagram showing forces acting at mid-oceanic ridges.
