Arrange the following metamorphic facies in increasing order of pressure: (A) Greenschist (B) Eclogite (C) Albite-Epidote hornfels (D) Blueschist
Choose the correct answer from the options given below:

Correct option is D

The correct answer is (d) C, A, D, B. The increasing order of pressure for the listed metamorphic facies is:
1. (C) Albite-Epidote hornfels:
· Forms at low pressure and low to moderate temperature conditions, typically in contact metamorphism settings.
2. (A) Greenschist:
· Forms under low to moderate pressure and low temperature conditions, characteristic of regional metamorphism.
3. (D) Blueschist:
· Forms under high pressure and low temperature, typically in subduction zones.
4. (B) Eclogite:
· Forms under very high pressure and high temperature, characteristic of deep subduction zones.
Information Booster 1. Albite-Epidote Hornfels Facies:
· Formed by contact metamorphism with low pressure and moderate temperatures (200°C to 450°C).
2. Greenschist Facies:
· Forms at pressures of 2–10 kbar and temperatures of 300°C to 450°C. Minerals include chlorite, epidote, and actinolite.
3. Blueschist Facies:
· Forms in subduction zones at pressures of 7–20 kbar and temperatures of 200°C to 500°C. Characteristic minerals are glaucophane and lawsonite.
4. Eclogite Facies:
· Forms at very high pressures (greater than 15 kbar) and temperatures of 400°C to 800°C. Characteristic minerals are omphacite and garnet.
Additional Knowledge · Metamorphic Facies:
· Distinct sets of minerals that form under specific pressure and temperature conditions.
· Pressure-Temperature Conditions:
· Contact Metamorphism: Low pressure, high temperature.
· Regional Metamorphism: Varies from low to high pressure and temperature.
· Subduction Metamorphism: High pressure, low temperature.