Question

The characteristic rock of contact metamorphism is

• A. hornfels
• B. blueschist
• C. eclogite
• D. granulite

Hint:

Hornfels are a common product of contact metamorphism, formed by the heat from nearby magma altering the surrounding rock.

Answer 1

The Correct Option is A

Step 1: Understanding the question.
Contact metamorphism occurs when rocks are heated by nearby magma or lava. The characteristic rock produced by this process is called hornfels. Hornfels are fine-grained, foliated rocks that form due to heat and pressure from the intrusion of molten rock.
Step 2: Analyzing the options.
(A) hornfels: Correct — Hornfels is the typical rock formed during contact metamorphism.
(B) blueschist: This rock forms under high-pressure conditions, typically in subduction zones, not contact metamorphism.
(C) eclogite: Eclogite forms under very high-pressure and temperature conditions, deep in the Earth's crust, not during contact metamorphism.
(D) granulite: Granulite forms under high-temperature conditions, but it is associated with regional metamorphism, not contact metamorphism.
Step 3: Conclusion.
The correct answer is (A) hornfels, as it is the characteristic rock formed by contact metamorphism.