Test metamorphic: QUESTION I Gencraly speaking, how is the chemical composition

Question

Test metamorphic: QUESTION I Gencraly speaking, how is the chemical composition of most metamorphic rocks going to compare to that of the parent rock? Chemical compositions will be nearly the same In order to be a metamorphic rock, the chemical composition must change by 50% There will be a complete compositional change Chemical composition is not necessary to understand metamorphic rocks t poists QUESTION 2 1. Physical rotation of platy minerals will contribute most to the development of foliation grade metamorphism. Low Medium Medium-High 1 points QUESTION 3 1. What is foliation? Intergrown mineral crystals formed from cooling magma Randomly oriented mineral crystals placed due to confining pressure Thin, parallel layers of clay sediments that have been compressed Roughly parallel layers of mineral crystals aligned perpendicular to the direction of pressure 1 points QUESTION 4 What is the definition of a parent rock? The rock that was altered by metamorphism The resulting precipitate when water dissolves mineral matter The rock produced by metamorphism The igneous rock forming through solidification of magma 1. 1 points QUESTION 5 What kind of force will create foliation in metamorphic rocks? Tension 1. Compression Shear Brittle I points QUESTION 6

Explanation / Answer

answer 1 - achemical compositions will be nearly same.

metamorphism is an isochemical process , where the original rock is subjected to various pressure and temperature conditions, as a result the minerals in the protolith rock will recrystallize to form new minerals of same composition.

metasomatism is another process, where addition of fluids and gases makes the protolith rock to undergo changes in chemical composition.

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