Consider the following statements regarding metamorphic rocks :
I. They undergo recrystallization and reorganization of the original minerals.
II. Foliation and banding are associated with these rocks.
III. Gneissoid and syenite are examples of these rocks.
Which of the statements given above are correct?

Result

Your answer: — · Correct: A

Explanation

Statements I and II are correct. Metamorphism is the process where existing rocks (igneous or sedimentary) undergo recrystallization and reorganization of minerals due to intense heat and pressure. Foliation (or lineation) occurs when minerals align in layers or lines during this process. Banding is a specific metamorphic texture where minerals of different densities or colors arrange into alternating light and dark layers, common in high-grade metamorphic rocks like gneiss.

Statement III is incorrect. While gneiss (gneissoid) is a metamorphic rock, syenite is a coarse-grained intrusive igneous rock. It is similar to granite but contains little to no quartz, consisting primarily of alkali feldspar. Therefore, it does not belong to the category of metamorphic rocks.

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SIMILAR QUESTIONS

Consider the following statements : 1. Rocks do not remain in their original form for long and undergo transformation. 2. Transformation of rocks is caused by weathering, erosion and metamorphic action. Which of the statements given above is/are correct?

Which one of the following statements about metamorphic rocks is not correct?

Consider the following statements about rocks I. Shale becomes slate through metamorphosis II. Shale is converted to slate when it is subjected to tremendous pressure and high temperature Which of the statements given above is/are correct ?