Which of the following pairs is INCORRECTLY matched? Parent rock Metamorphosed rock

Question

Question

This question was previously asked in

Kerala PSC Common Preliminary Exam (GRADUATE LEVEL) PYP 38-24

Answer 1

The incorrectly matched pair is Sandstone – Schist. as Sandstone becomes Quartzite, not Schist.

Key Points

It's important to remember that different types of rocks undergo different transformations during metamorphism, depending on their original composition and the intensity of the metamorphic forces.

Important Points

Metamorphic Facies: Sets of mineral assemblages that indicate specific temperature and pressure conditions during metamorphism.
Index Minerals: Minerals that are characteristic of particular metamorphic grades. Foliation: The layering or banding in metamorphic rocks caused by the alignment of platy or elongate minerals.
Recrystallization: The process where existing minerals in a rock are transformed into new crystals of the same or different minerals.

Additional Information

Granite - Gneiss is a classic example of a parent rock (granite) transforming into a metamorphic rock (gneiss) through the process of metamorphism.
Limestone - Marble is an excellent and very common example of a sedimentary rock transforming into a metamorphic rock.
The transformation from shale to slate is a classic example of low-grade metamorphism. The main change is the alignment of clay minerals, which gives slate its characteristic cleavage.