4. Is igneous intrusion J older or younger than layers A and B? What two relativ

Question

4. Is igneous intrusion J older or younger than layers A and B? What two relative dating principles apply to your answer? Intrusion J is Relative dating principles: than layers A and B. and 5. Is the igneous intrusion dike K older or younger than layers C-F? List the entire sequence of events, in order from oldest to youngest, by writing the appropriate letters in the spaces provided on the figure. 6. 7, An analysis of a mineral sample from dike K indicates that 25% of the parent isotope is present in the sample. a. How many half-lives have elapsed since dike K formed? b. If the half-life of the parent isotope is 50 million years, what is the numerical age Write your answer next to dike K on Figure of dike K? 1 as well. 8. An analysis of a mineral sample from intrusion J indicates its age to be 400 million years old. Write the numerical age of rock J on Figure 1. 9. Are rock layers H and I younger or older than 100 million years? Explain. 10. Determine the possible age range of rock layer E. Layer E is between million years old. and 11. Determine the age of rock layer A. Rock layer A is greater than million years

Explanation / Answer

4.Igneous intrusion J is younger than Rock layers A and B.The relative dating principle used to determine is  Cross-Cutting Relationship.This defines that  anything that cuts across rock layers is younger than the rock layers it cuts through.Igneous Intrusions CUT through rock layers are always YOUNGER.

5.Igneous intrusion Dike K is younger than Rock layers C-F.

6.Sequence

Deposition of Rock layers From A (Oldest)-B-C-D-E-F-G (youngest).

Then there is a Faulting with Fault L

Then there is an intrusion J.

Then you have a Dike K being cross cut.

Then there is an unconfirmity with erosion of Rock Layer G.

Then rock layer H is depodited and above it we have Rock layer I.

7. a) 4 half lives

b) The numerical Age of Dike K is 200 million years.

I can do First 4 questions only according to the rule.

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