b) Mesoaoie rassic PROBLEM -Cross Section (6 ppts) dest (1) to a) Label the foll
ID: 115540 • Letter: B
Question
b) Mesoaoie rassic PROBLEM -Cross Section (6 ppts) dest (1) to a) Label the following events from ol youngest (6). 3 pts) eansrise or land subsides - deposition of sed units D, C, and forming ue K Fault L _ Folding of sed units E, F, G, H, I, J Deposition of sed units E. F. G. H,I Igneous intrusion A Fault L 1O) What type of unconformity (ue k) exists between sedimentary units H, 1, J and uni the fault? (0.5 pt) a) disconformity t D, on the right hand side of ) angular unconformity 11) What type of fault (specifie type) is fault L? (0.5 pt) a) left lateral strike slip b) reverse e) right lateral strike slip d) normal 12) What type of stress is associated with fault L? (0.5 pt) ductile (plastic) a) compression Fault L is an example of what type of deformation (strain)? (0.5 pt) a) compression At what type of plate boundary would this type of fault form? (0.5pt) b) tension d) brittle e shear 13) b) ductile (plastic) e) tension d) elastic e) brittle 14) a) divergent b) convergent c) transform 15) What type of folding of layers E, F, G, H, I do you see in the footwall side of the fault? (0.5p) a) syncline b) anticline c) brittle d) plastic 16) Intrusion A contains rocks with radioactive isotopes, with half life for parent being 350,000,000 years. If there a) 175,000,000 years are 50% parent atoms and 50% daughter atoms in the sample now, how olds intrusion A? (05 p) b) 350 million years c) 700 million years d) 1,050,000,000 yearsExplanation / Answer
10) The unconformity is angular unconformity. Because the bedes below the erosional surface are tilted and folded.
11) Fault L is reverse fault. Because the hanging wall or right side of fault plane moves upward.
12) Brittle stress is associated with the fault. Because fault is formed by brittle deformation.
13) Fault L is an example of brittle deformation.
14) This type of fault is found in convergent plate boundary. Because convergent plate form reverse fault.
15) Always footwall is fixed and hanging wall moves along fault plane. In the map left side of the fault plane is footwall. The layer E, F, G, H, I represents anticline fold. Because the layers show a ridge or fold of stratified rock in which the strata slope downwards from the crest.
16) As the radioactive elements contain 50% daughter element and 50% parent element. It means that the radioactive elements is now in half life position.
if the half life of radioactive element is 350,000,000 years then the age of the intrusion is 350,000,000 years or 350 million years.
17) Since the age of the rock is 350 million years, it means that the intrusion intruded at the time of mesozoic, cretaceous time.
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