ESC1000C_Rocks_LabExploration_AnswerTemplate_Summer2023_v1 (1)
docx
keyboard_arrow_up
School
University of Florida *
*We aren’t endorsed by this school
Course
1000
Subject
Geology
Date
Feb 20, 2024
Type
docx
Pages
3
Uploaded by DukeMosquito3920
Florida SouthWestern College
Introduction to Earth Science
Exercise 3: Rocks Answer Template
Directions:
Although you can work together as a group, each individual student should compose their own well-conceived and articulate answers on the RockLab_AnswerTemplate.docx (see Rock Exploration Activity page). Please submit
the .docx Answer Template to the Rock Exploration Assignment page. Alert me by email if you have any questions or issues accessing the files. The answer form below works best in MS Word which is freely available via FSW’s Office 365, please click and then type in areas designated (“
Click or tap here to enter text”). Igneous Rock Questions 1.
Answer the questions based on the texture quality of the igneous rocks only
.
a)
Rhyolite, Andesite, and Basalt.
b)
Granite, Diorite, and Gabbro
c)
Obsidian
d)
Felsic: A compositional group of igneous rocks that indicates a rock is composed almost entirely of light-colored silicates. Also called granitic composition
. This group includes Granite and Rhyolite.
Mafic: A compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calcium-rich plagioclase feldspar. Also called basaltic composition. This group includes Gabbro and Basalt.
e)
(Complete sentences) Coarse and fine-grain texture is dependent on the rate of cooling of the magma. The faster the cooling period the finer the grain size because the crystals don’t have enough time to grow larger. Coarse-grained igneous rocks are generally formed deep under the crust while fine-grained igneous rock forms closer to
the surface 2.
Locate on the diagram below where you would expect each of the igneous rocks listed above to form considering whether on average, they are intrusive (cool slowly), extrusive (cool quickly), or cool instantaneously. Indicate on your worksheet where all the igneous would likely form (A, B, or C).
a)
Granite, Diorite, and Gabbro
b)
Rhyolite, andesite, and Basalt
c)
Obsidian
Continue to the next page…
3.
Classify (type of texture and felsic/mafic) and identify (general name (ex. “granite”) both of the igneous
rocks in the picture series below. Provide the reasons for how you know… (Example: “Felsic intrusive igneous rock, possibly a granite based on …”)
Photo 1: Intermediate Intrusive Igneous Rock; Possibly Diorite based on its almost equal parts of light and dark color and coarse grain texture.
Photo 2: Felsic Extrusive Igneous Rock; Possibly Rhyolite based on its light color and fine grain texture.
Sedimentary Rock Questions – use the Rocks_LabExploration.pdf for rock images (slides 6-11)
4.
By what characteristic are detrital sedimentary rocks classified? What are the specific classification categories?
Detrital sedimentary rocks are classified by their particle size. Classification categories are Gravel (Boulder, Cobble, Pebble, Granule), Sand, and Mud (Silt, and Clay).
5.
Arrange the following 5 steps (Transport, Deposit, Cement, Weather, Compression) in the correct sequence starting from an exposed, pre-existing rock to the formation a detrital sedimentary rock. Weather, Transport, Deposit, Compression, Cement
6.
Answer the questions below based on the sedimentary rocks found in the rock image .pdf
a)
The grain size of conglomerate stone is massive compared to sandstone. It is full of rounded cobbles and pebbles while the sandstone contains angular sand grains. b)
Boulder and Cobble sized particles. The Conglomerate rocks
7.
Answer the two questions below:
a)
This would lead to extremely fine rounded particles.
b)
Shale would be comprised of these very fine particles.
8.
Once deposited, how are the individual particles in a detrital sedimentary rock put together to make a new rock?
Through either Compaction (pressure forcing the individual particles to stick together), or Cementation (minerals and water seep between the individual particles and harden together).
9.
Metamorphic Rock Questions
– (slides 12-18)
a)
Contact Metamorphism occurs when the parent rock comes into contact with a magma flow. The heat from the magma will cause metamorphic changes. Regional Metamorphism occurs during mountain building when the parent rocks are subjected to high heat
and pressure.
b)
The Slate and Anthracite Coal both exhibit low-grade metamorphism.
c)
The Gneiss, Schist, Marble, and Quartzite all exhibit High-grade Metamorphism. The rough texture of their larger grain sizes shows this.
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