CVNG 1011 Geology Due Date: Monday 23 March, 2018 before 12:30 pm The iformanion
ID: 289527 • Letter: C
Question
CVNG 1011 Geology Due Date: Monday 23 March, 2018 before 12:30 pm The iformanion yow 'Wl need for this lab is, Jor the most part, in the course notes and in the extra reading material posted on the cowrse websine bwt yow will need to dig around for some more background inforasarion, and you wi need to ase some engineering jwdgement to answer some of the questions Consider the following geologic and stratigraphic features. Sequence of Events The diagram above shows several types of rock bodes, unconformities, and crossourting relationships. The major rock bodies, faults, and unconformities are labeled by letters, each in the column below. Study the diagram and list these events in their proper chronological order rock G of dolerite Briefly justify your choice. Say why it is in that order giving reasons etc.Explanation / Answer
The events according to their chronological order can be stated as(from older to younger) follows:
Metamorphic rock (E)
Igneous intrusion of granite (B) and (D)
Erosional surface (K)
Inclined sequence of sedimentary rocks (A)
Igneous intrusion of dolerite (F)
Erosional surface (C)
Horizontal sedimentary sequence (L)
Alluvial fan (I)
Igneous intrusion of dolerite (G)
Volcanic cinder cone (H)
Lava flow (J)
This can be explained by the principal of cross cutting relationship which states that any layer which cuts across another layer or bed is younger than the layer which it cross cuts and the principal of superposition which states that under normal conditions, any sequence of rocks or beds are normally deposited in layers beginning from the oldest layer at the bottom and youngest layer at the top, each layer being younger than the layer above it. Here, the intrusion of granite and the metamorphic rock lies at the bottom which makes them the oldest followed by the erosional surface (K) overlying them and then the deposition of sedimentary layers above it which were later tilted (A). There is no clear relationship between the layers B and D so probably they were deposited simultaneously from the same source. Again, the igneous intrusion of dolerite(F) has been cut across by the erosional surface (C) which makes F older than C. The erosional surface (C) is followed upwards by the deposition of the horizontal sedimentary beds (L) and alluvial fan (I) at the top. The volcanic cinder cone cuts across all the layers of C, L and I which makes it younger than all of these layers so it was formed after them followed by the lava flows(J) at the top.