20-08 Metamoprhic Rocks_NOTES.docx - EES: 1030 –...

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EES: 1030 – Metamorphic RocksSeptember 17th, 2020Study Guide Questions1.What determines what kind of metamorphic rock we will end up with-what factors areimportant?2.What are our metamorphic agents? Relatedly, what are our different kinds of pressure,and what does confining pressure result from?3.What are some of the different sources of fluids in metamorphism?4.What is a protolith, and why does it matter in metamorphic rock formation?5.We talked about physical changes that you might see in rocks due to metamorphism.Know the three changes that we might anticipate, and be able to give examples of rockswhere we would see reorientation of crystals as well as rocks where we might instead seeonly recrystallization of minerals into fewer, larger grains.6.How does schistosity differ from a slaty or phyllitic texture?7.Why do we observe bands of felsic and mafic minerals in gneiss?8.What’s special about migmatite-what has happened to the felsic minerals in these rocks?9.How does marble form, and what does it form from? What major changes might weobserve in a marble, relative to our protolith?10. How can we use index minerals to learn about the conditions of metamorphism?11. With increasing metamorphic grade, how would you expect crystal size and foliation tochange?12. Be able to recognize the different descriptions of metamorphic environments, knowwhere you might find them, and know the particular characteristics of the metamorphismthat you would observe in each environment. For example, what does contactmetamorphism result from, and what are its characteristics in terms of pressure andtemperature? What about impact metamorphism? What is significance of eclogites?METAMORPHIC ROCKSReview: Igneous rocksBrief introduction: Sedimentary rocksRemember the rock cycle: these are the paths and processes by which rock types change at theEarth’s surface and interior. If you take igneous or sedimentary or metamorphic rocks and addpressure/temperature/fluids, you get metamorphic rocks!From Greek“meta”(change) and“morph”(form)Changes in mineralogy, texture, and often chemical composition of a solid rock occur becauseminerals and rocks experience conditions unlike those they formed under.What we get is dependent on:1.)The parent rock, or protolith(igneous? Sedimentary? Metamorphic? Rock type?)2.)The degree of metamorphism(the time over which a rock is being metamorphosed)1

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Term
Fall
Professor
BradleyCramer
Tags
Metamorphic rocks

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