Metamorphic Rock Statements Analysis
This question asks to evaluate two statements about metamorphic rocks. Let's analyze each statement:
Statement 1: Ortho-metamorphic Rocks Origin
Statement 1 claims that "Ortho-metamorphic rocks are formed from igneous rocks."
- The term 'ortho-' in metamorphic petrology indicates that the parent rock (protolith) was an igneous rock.
- Therefore, ortho-metamorphic rocks are indeed metamorphic rocks derived from igneous precursors.
- Statement 1 is correct.
Statement 2: Heat Metamorphism Identification
Statement 2 claims that "Intense heat of the intruding magmas results in metamorphism of the surrounding rocks, a process known as dynamic metamorphism."
- Metamorphism caused by the heat radiating from intruding magma bodies is specifically called contact metamorphism or thermal metamorphism.
- Dynamic metamorphism, conversely, is caused by mechanical stresses and deformation, typically occurring along fault zones.
- Statement 2 incorrectly equates heat-driven metamorphism with dynamic metamorphism.
- Statement 2 is incorrect.
Conclusion on Statements
Based on the analysis:
- Statement 1 is correct.
- Statement 2 is incorrect.
Therefore, only statement 1 is correct.
