Geology. Sandstone Shale Intermediate Igneous Felsic Igneous Mafic Igneous Compl

Question

Geology.

Sandstone Shale Intermediate Igneous Felsic Igneous Mafic Igneous Complete the geologic history by correctly inserting the following events in the proper sequence. Use the letters in the correct order, to fill in the blanks. Remember to start with the oldest at the bottom Using rock and process names, describe the sequence of events in words in the box below Include the following terms at least once: Intrusion, deposition, uplift, erosion, precipltation, compression, folding, faulting, burial, cooling, metamorphism Hints: Group sedimentary layers that "behave" in the same way together Some processes occur more or less at the same time. Put these on the same line. You may need to use one or more of the above more than once. a.(1) An angular unconformity is represented by b. (1) What two units can you be sure represent a disconformity? C. (1) If K is limestone, what kind of rock is developed when K is in contact with E? d. (1) If J is a quartz sandstone, then what is the type of rock that you would expect to find whenis in contact with D? e. (1.5) The three igneous units in the sequence, from oldest to youngest, are (by letter) f. Igneous rock ages are (i)360 Ma, (ii) 300 Ma, (ii) 200 Ma. g.(1) Which of the igneous rocks is 360 Ma? 2) Which dating method would you recommend for this unit and why? h. (2) Given the age of the igneous bodies, could you use the C4 method to date Unit K? Why or why not? L (1) What type of fold is found in the centre of the cross-section (between Q and R)? j (1) What two minerals are likely to dominate rock unit E? k·(15) what three minerals are likely to dominate rock unit N? L. (2) There are two faults. The fault at Q is what type of fault? Does this type of faulting represent tensional or compressional forces? m. (2) The fault at R is what type of fault? Does this type of faulting represent tensional or compressional forces? n. (2) What complete and accurate statement can you make about the relative age of the faulting? You are given 6 rocks. Folowing the uplift and erosion of the felsic igneous intrusion (#1), a sequence of fine thin layers (#2) and wel-sorted quartz-nch (#3) terrestrial clastic sediments were deposited and ithified The next sequence of sediment was "deposted follawing sea level rise, which resulted in the presence of extensive reefs (84) These rocks were later intruded by a fine-grained, mafic igneous body (W5), not connected to the overlying volcano The latest igneous event resulted in an intermediate fine-grained intrusive dyke that cross-cuts the entire sequence (B) So... you have 6 descriptions of rocks/rock sequences, and the objective here is to match each of the 6 rocks with one of the letters in the diagram on the first page, and suggest a possible rock name for each, by completing the table below Sample | Letter from diagram Possble rock type (from the description given) #1 N2 #3 #4 #5

Explanation / Answer

P (Youngest)

T

E

M

L

R

K

J

H

S

N

Q

F

G

C

B

A(Oldest)

D and E are intrusion.

K, J and H which forms a sedimentary package can be metamorphed by these intrusions.

Q and R are faults.

a.Angular unconformity is represented by horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers.

b. H and J represent a Disconformity

c. Marble will form as K (limestone) will metamorph to give marble due to contact metamorphism.

d. Quartzite will be obtained when metamorphism of quartz sandstone (j) will take place due to the contact with D.

e. N(oldest), E and D(youngest)

g. N is 360 million year old

we can opt for uranium lead dating as it its half life is 4,500 million years.

h. No, we cannot use C14 dating as its half life is 5,730 years and hence we cant find the age of the unit by this method.

i. Anticline is found.

j. E is an magmatic intrusion which are generally rich in quartz and plagioclase feldspar.

k. Quartz, feldspar and copper can be found in N.

l. Q is reverse fault as the foot wall is going relatively downwards.

This is caused by compressional forces.

m. M is also reverse fault as the foot wall is going relatively downwards.

This is caused by compressional forces.

n. The faulting happen before the deposition of formation H

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.