to earnusask 3. Consider the following geologic and stratigraphic features. E. I
ID: 113450 • Letter: T
Question
to earnusask 3. Consider the following geologic and stratigraphic features. E. Igneous intrusion-granite G. Igneous intrusion-granite H. Volkankc cinder cone L Alluvial fa J. Lava Bow K. Erosional suface L. Horomal sedimentary sepuence cal, onder in the adjacent column. Seady Sequence of Events The diagram above shows several types of rock bodies, unconformities, and crosscuting relatioeships, Although this is a hypothetical situation, all the rela tionships between nock bodies and landlorms shown in the diagram occur in the Colorado Plateau. The mago oxk C. Eonional surface bodies, faults, and unconformities are labeled by leters, each representing a significant geologic event. These are shown in alphaletical, not chronog A. Inclined sequence of sedimen tary rock B. Igneous intrusion basalt D. Igneous intrusion hasal a) List the 3 oldest geologic features and the 5 youngest and briefly justify your choice. b) If you were searching for a location for a nuclear fuel waste repository, are there any units or formations here that you would either definitely wish to investigate or that you would remove from consideration at the outset? Provide reasons (briefly)?Explanation / Answer
a. The 3 oldest geological features are
1. Metamorphic (E)
2. Igneous intrusion- Granite (F + G)
3. Erosional surface ( K)
The youngest features are as follows :
1. Identified sedimentary sequence (A)
2. Igneous intrusion- Basalt (D)
3. Erosional surface (C)
4. Igneous intrusion (B)
5. Horizontal sedimentary sequence ( L)
6. Volcanic cinder cone ( H)
7. Alluvial fan (I)
As metamorphic or igneous rocks occur as basement so they are always oldest features. After their depostion erosion takes place and sedimentary sequence is deposited. Volcanic cinder cone and alluvial fan are formed at last period.
b. For a nuclear fuel waste repository, granite and sedimentary rocks are the suitable places. The reason is deep stable geological environment is good for repository, particularly below 300m. These places provide high level of long term isolation and future maintanance is not needed.
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