(a) In Exercise 7.2, your instructor provided you with four rocks and you identi
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Question
(a) In Exercise 7.2, your instructor provided you with four rocks and you identified their minerals and chemical composi- tion. Compare the mineral content and most abundant ions from the four rocks you were given with the four main compositional classes of metamorphic rocks. What protoliths produced the four specimens you studied? bol Specimen 1 Specimen 2 Specimen3 Specimen 4 bo Shale Umestene shale basalt Protolith (b) How would your interpretation of protoliths be affected if you learned that the area had experienced significant meta- somatism? Explain.Explanation / Answer
a.
1&3)
shale is a sedimentary rock and it will converts progressively into slate
shale ----->slate
2)
basalt: basalt is a basic igneous rock its metamorphism is tricky it depends on the grade of metamophism going
low grade regional, high pressure >>>>blueschist
medium grade regional >>>>> greenschist
medium grade regional >>>>> amphibolite
4)
limestone -----------> marble
b.
On significant metamorphism different rock behave differently shale will become slate on further metamophism it will become phylite ,phylite will become schist and on high grade metamorphism will become gniess.
metamorphic product of a rock depend on its lithology composition and grade of metamorphism as mentioned above different class of rock will evolve from different rock .
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