GEOLOGY
PHYSICAL GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which nonfoliated rock forms only in a zone of contact metamorphism?
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conglomerate
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hornfels
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pegmatite
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quartzite
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Explanation:
Detailed explanation-1: -Hornfels is another non-foliated metamorphic rock that normally forms during contact metamorphism of fine-grained rocks like mudstone or volcanic rock (Figure 7.13). In some cases, hornfels has visible crystals of minerals like biotite or andalusite.
Detailed explanation-2: -Contact metamorphism produces non-foliated (rocks without any cleavage) rocks such as marble, quartzite, and hornfels.
Detailed explanation-3: -Hornfels is medium-to-coarse crystalline metamorphic rocks formed out of contact metamorphism, dark color, and rich in silicates with granoblastic and porphyroblastic texture.
Detailed explanation-4: -A) Hornfels is a rock that is created by contact metamorphism.
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