Schistose texture

Metamorphic Rocks Quiz

Quiz
•
Science
•
Professional Development
•
Hard
Ryan Lawson
FREE Resource
45 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Light (e.g., quartz and feldspar) and dark (e.g., mica) are separated into parallel bands across the rock
Mica minerals with pyrite porphyroblasts
Platy minerals aligned at 90 degrees in the direction of maximum pressure
Platy minerals aligned at 90 degrees in the direction of maximum pressure in thin layers
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Example of poikiloblastic texture
Mica minerals with pyrite porphyroblasts
Spotted rock, hornfels
Crystals in a spotted rock
Large crystals that form after the groundmass
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What size and shape crystals do medium-grade metamorphic rocks typically have?
Medium, subhedral crystals
Fine, anhedral crystals, as there is little time to recrystallize
Gneiss
Quartzite
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Examples of a regionally-metamorphic rock
Marble
quartzite
Pumice, obsidian, basalt
Slate, schist, gneiss
Igneous, sedimentary, and metamorphic
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What rock does sandstone become under medium- and high-grade metamorphism?
Granite Gneiss
Quartzite
Marble
Gneiss
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Thermal/contact metamorphism
Friction from major fault planes, low temperature and high pressure
In shale/mudstone, as they contain many minerals
Compaction of sedimentary rocks, low temperature and high pressure
Igneous intrusions, high temperature and low pressure, no foliation
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does intrusion volume affect metamorphism?
Mafic magmas are ~1200 degrees, and silicic ~850 degrees, so mafic intrusions generally have a wider metamorphic aureole
The extent of heat and pressure on the rock
Some rocks (e.g., mudstone) are affected by metamorphism more than others (e.g., sandstone)
The larger the volume, the wider the metamorphic aureole
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