Question

For the given Barrovian metamorphic sequence, which of the following statements are correct?

• A. Grade of metamorphism increases from left to right.
• B. ‘P’ isograd is the Garnet isograd.
• C. Zone ‘Q’ is the Garnet zone.
• D. ‘R’ isograd is the Kyanite isograd.

Answer 1

The Correct Option is A, C, D

Understanding the Barrovian Metamorphic Sequence 

Step 1: Evaluating the Given Options

• (A) Grade of metamorphism increases from left to right: Correct. In the **Barrovian metamorphic sequence**, the grade of metamorphism indeed increases as we move from **Chlorite** (left) to **Kyanite** (right), with the temperature and pressure rising.
• (B) ‘P’ isograd is the Garnet isograd: Incorrect. While the **‘P’ isograd** is an important marker in the Barrovian sequence, it does not specifically represent the **Garnet isograd**, which occurs later in the sequence.
• (C) Zone ‘Q’ is the Garnet zone: Correct. In the **Barrovian sequence**, Zone ‘Q’ corresponds to the **Garnet zone**, where Garnet forms as a result of increasing pressure and temperature.
• (D) ‘R’ isograd is the Kyanite isograd: Correct. The **‘R’ isograd** marks the **Kyanite isograd**, where Kyanite forms due to increasing temperature and pressure.

Step 2: Selecting the Correct Answers

Based on the above analysis, the correct answers are:

\[ \mathbf{(A),\ (C),\ \text{and}\ (D)} \]

Final Answer:

Thus, the correct options are: (A), (C), and (D).