In the isochemical phase diagram shown below, the curved arrow represents the P-T path. The variance at peak metamorphism is _.
The units A to H marked on the figure represent different rock formations. Select the option that describes the chronological sequence from old to young.
Consider two intersecting, north-easterly striking and south-easterly dipping dikes Y1 and Y2, which are exposed on an east-west trending vertical wall of a granite (X) quarry as shown below.
The angle that the dikes make with the horizontal on the quarry wall is
Group I | Group II |
P. Sillimanite | 1. First order |
Q. Quartz | 2. Second order |
R. Muscovite | 3. Greater than third order |
S. Calcite | 4. Third order variegated |