Final Chapter 5 Flashcards
Do metamorphic rocks form when rock melts and then crystallizes?
Metamorphism is a solid-state process, it uses heat and pressure which causes
-new minerals to create
- the development of bands or layers of like minerals
-the parallel alignment of new and old mineral crystals
What causes contact metamorphism? Regional metamorphism?
regional metamorphism: occurs over areas of hundreds or thousands of square kilometers
contact metamorphism: heat from an intruding body of magma to the surrounding rocks
What is directed pressure and how does it help form foliated metamorphic rocks? And related to this, are you most likely to have foliated metamorphic rocks forming in the middle of a tectonic plate or along convergent
plate boundaries?
Directed pressure: pressure that is greater in one direction that in others (pressure is created at convergent boundaries)
-????
Do you have regional or contact metamorphism along subduction zones?
contact metamorphism occurs along subduction zones
Which of the following rocks are foliated or nonfoliated: Anthracite, slate, quartzite, phyllite, schist, marble,
gneiss?
Nonfoliated: slate, phyllite, schist, gneiss
Foliated: anthracite, quartzite, marbles
List the foliated metamorphic rocks form lowest to highest metamorphic grade
lowest-slate-phyllite-schist-gneiss-migmatite-greatest
Which of the following index minerals is the lowest grade: Chlorite, biotite, staurolite, garnet, kyanite,
sillimanite. Which is the highest grade?
lowest-chlorite-biotite-garnet-staurolite-kyanite-sillimanite-greatest
Based on the exercise you did (or Fig. 5.14), are foliated or non-foliated rocks in general more likely to contain
these index minerals?
foliated rocks are more likely to contain index minerals
What does metamorphic grade tell us? How does a higher metamorphic grade relate to where an ancient
mountain belt was highest or lowest?
-intensity of metamorphism; range of temperatures and conditions
-higher mountain belt
