GEOLOGY
PHYSICAL GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following sets is arranged in order of increasing metamorphic grade?
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shale - slate - phyllite
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phyllite - slate - schist
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phyllite - gneiss - schist
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schist - shale - gneiss
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Explanation:
Detailed explanation-1: -Low-grade metamorphism begins at temperatures and pressures just above sedimentary rock conditions. The sequence slate→phyllite→schist→gneiss illustrates an increasing metamorphic grade.
Detailed explanation-2: -Regional metamorphism of shale occurs in the following sequence: Slate, phyllite, schist, gneiss.
Detailed explanation-3: -Gneiss, the highest grade metamorphic rock, contains bands of easily visible quartz, feldspar, and/or mica.
Detailed explanation-4: -Eclogites: These are medium to coarse grained consisting mostly of garnet and green clinopyroxene called omphacite, that result from high grade metamorphism of basic igneous rocks. Eclogites usually do not show foliation.
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