Question

Which of the following statements are true for migmatite?
A. Both igneous and metamorphic components are involved in its formation,
B. It is formed under high temperature and high pressure conditions,
C. Felsic and mafic components may be separated during its formation,
D. It is formed due to prolonged activity of chemically active fluids. Choose the correct answer from the options given below:

• A. A and C only
• B. A and B only
• C. A, B and C only
• D. A, C and D only

Hint:

Migmatite is formed by partial melting during high-grade metamorphism and shows both igneous and metamorphic features.

Answer 1

The Correct Option is C

Concept:
Migmatite is a mixed rock showing both metamorphic and igneous characters. It is commonly formed under very high-grade metamorphic conditions where partial melting takes place.

Step 1: Check statement A.
Migmatite contains both metamorphic portions and igneous-looking melted portions. \[ A \text{ is correct} \]

Step 2: Check statement B.
Migmatites generally form under high temperature and high pressure conditions during high-grade metamorphism. \[ B \text{ is correct} \]

Step 3: Check statement C.
During partial melting, felsic material may separate from darker mafic material. \[ C \text{ is correct} \]

Step 4: Check statement D.
Prolonged activity of chemically active fluids is more closely related to metasomatism, not the main formation process of migmatite. \[ D \text{ is incorrect} \] Thus, the correct statements are: \[ A,B,C \] \[ \therefore \text{Correct Answer is (C)} \]