Fall22Quiz7
docx
keyboard_arrow_up
School
University of Kansas *
*We aren’t endorsed by this school
Course
101
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by DoctorSummer16429
Geology 101, Fall 2022, Quiz 7
Due
11:59 pm on Monday, November 14
th
.
1.
In three or four sentences, describe the role that temperature, pressure, and
fluids play in creating metamorphic rocks.
How do geologists reconstruct the
temperature and pressure at which a metamorphic rock was formed? (8 pts)
Temperature plays a big role in its specific mineralogy, chemical composition,
and texture by altering the existing crystal structures by breaking the chemical
bonds formed. Pressure changes a rocks mineralogy, chemical composition, and
texture through the process of placing stress on a rock. Fluids can change a rocks
mineralogy and chemical composition by removing or adding chemical agents
that are soluble in water. This has been experimented with differing pressures
and temperatures on rocks to understand when changes or how these occurred.
2.
Where in the world would you go to find blueschist, greenschist, and amphibolite
facies metamorphism? Be specific: what plate tectonic setting would you go to, in
what location in that setting would you look, and how deep would you need to
go?
(6 pts)
Blueschist is found at subduction zones with depths of 20km-50km.
Greenschist is found at convergent boundaries lying beneath mountains with
depths of 5km-30km. Here the areas are of mid to high pressure and
mid temperatures of 500
C.
Amphibolite is found at convergent boundaries under mountains in areas of partial
melting, within depths of 10km-40km in these areas of high temperatures and high
pressure.
3.
In three or four sentences and in your own words, describe the formation of a
sedimentary rock from weathering, erosion, transportation, deposition, and
burial, through diagenesis.
Before doing your reading, you might have thought
that these words were all synonymous—make sure your explanation
distinguishes what each of these processes mean.
(8 pts)
Weathering of rocks are rocks that break into sediments by chemical or physical
processes like thawing. Erosion dislodges the sediments, where then transportation
of those sediments moves them to differing locations through things like wind,
streams, and rain. These sediments settle out and dissolve with deposition. And the
remaining sediments form layers on top of older ones through burial. Finally, the
sediments then become lithified and create what we call sedimentary rocks or
diagenesis.
4.
Sediments are often transported by currents of air or water.
How does the
particle size that can be transported depend on the current strength/energy?
(3
pts)
When these currents slow the heavier particles settle to the bottom and rest
there. If the current goes from really fast to very slow gravel will be on the
bottom, then sand then mud on top. When it comes to particle size the bigger the
current of water is the bigger the particle that can be transported. The stronger
currents of 50cm/s can carry things like gravel. Moderate level currents that are
20-50cm/s can carry things like sand. The weakest of the currents which are less
than 20cm/s can only carry really small particles.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help