Question 1

Refer to the geologic province map (fig.13.18)to answer the question(s)below.
 
-What does the Superior craton represent?

Accepted Answer

The answer of Refer to the geologic province map (fig.13.18)to...

Question 2

An exotic terrane created by a seamount accreted to a continental margin would be composed ________.

Accepted Answer

A) of folded, quartz sandstone and shallow water, marine limestone 
B) exclusively of granite batholiths and rhyolite welded tuffs 
C) mainly of organic-rich, black shales and beach-type sandstones 
D) mainly of basaltic lava flows and minor, coralline limestone

Question 3

Refer to the geologic province map (fig.13.18)to answer the question(s)below.
 
-What does the Trans Hudson Orogen represent?

Accepted Answer

The answer of Refer to the geologic province map (fig.13.18)to...

Question 4

Intensely folded, thinly bedded, Paleozoic shales and carbonates cause this part of the Canadian Rockies to appear the most jagged and rough due to the easily-eroded shale interbeds.

Accepted Answer

A) Western Ranges 
B) Main Ranges 
C) Front Ranges 
D) Foothills

Question 5

Refer to the geologic province map (fig.13.18)to answer the question(s)below.
 
-Geochemically and thermally, what was the biggest difference between the early Earth and today?

Accepted Answer

The answer of Refer to the geologic province map (fig.13.18)to...

Question 6

British Columbia is "accreted terrane central" as it contains more than 39 separate terranes, all accreted during the past 200 million years with the westward motion of North America since the break up of Pangaea.

Accepted Answer

A) True 
 B)False

Question 7

Adjacent terranes accreted to a continent will generally show similar geologic histories for the time before joining and different geologic histories thereafter.

Accepted Answer

A) True 
 B)False

Question 8

Fault-block mountains occur in regions dominated by ________ faulting.

Accepted Answer

The answer of Fault-block mountains occur in regions dominated by...

Question 9

Which statement comes closest to describing the isostatic compensation under convergent continental mountain belts?

Accepted Answer

A) The extra elevation of mountains, like that of icebergs above the sea, is held up by the weight of the denser material that their lower portions displace. 
B) The extra elevation of mountains is maintained almost entirely by rising mantle plumes. 
C) The extra elevation of mountains is accounted for by the missing mass from adjacent eroded valleys and flanking lowland areas. 
D) The extra elevation of mountains is maintained by active elastic compression supplied by earthquake cycles and crustal convergence.

Question 10

Which one of the following is an example of an isostatic movement?

Accepted Answer

A) stream downcutting following a drop in sea level 
B) arching of strata at the centre of a dome 
C) numerous aftershocks associated with deep-hypocentre earthquakes 
D) uplift of areas recently covered by thick, continental ice sheets

Question 11

A good example of a present-day, passive, trailing, continental margin is the ________.

Accepted Answer

A) north flank of the East Pacific Rise 
B) west coast of South America 
C) east coast of the Japanese Islands 
D) west coast of Africa

Question 12

Which of the following best describes the geology of the Pacific coastal regions of western North America including Alaska?

Accepted Answer

A) An earlier, continental margin broke apart and the geologically similar fragments were tectonically reassembled. 
B) Geologically different, microcontinent-sized fragments and terranes, formed elsewhere, were tectonically accreted to North America. 
C) A massive subcontinent of old igneous and metamorphic rocks (similar to India)was accreted during late Proterozoic time. 
D) Tightly folded, continental shelf strata were squeezed between North America and the convergent, Bering-Siberian subcontinent.

Question 13

Turbidite sandstones with graded bedding would be common on continental shelves associated with trailing, passive, continental margins.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following geologic products or processes is not a result of mountain building?

Accepted Answer

A) building of a deep sea fan of turbidites offshore from a convergent continent-ocean margin 
B) downdropped extensional grabens with playa lakes 
C) exposure of belts of high pressure, Precambrian, igneous and metamorphic rocks within continental shield areas 
D) subsided sedimentary basins in the middle of continental cratons

Question 15

Thick blocks of crust carried toward a subduction zone ________.

Accepted Answer

A) can get sliced off the descending slab and transferred to the accretionary continental margin as an accreted terrane 
B) cause the subduction zone to stop or reverse and begin subducting the other way 
C) get eroded, contributing a greater than usual volume of sediments to the trench at that point 
D) get uplifted to become an island on the oceanward side of the trench

Question 16

Microcontinental fragments, island arcs, oceanic plateaus and volcanic island chains plus intervening packages of sediments are all commonly accreted in ocean-continent margin settings.

Accepted Answer

A) True 
 B)False

Question 17

Subduction zones include all of the following except for ________.

Accepted Answer

A) deep ocean trenches 
B) magma generation 
C) suture zones 
D) volcanic arcs

Question 18

According to the Wilson Cycle, continents first break up by forming internal subduction zones that rift them apart and immediately reduce the size of their margins by subducting so much sediment.

Accepted Answer

A) True 
 B)False

Question 19

During the Late Paleozoic (Devonian through Carboniferous), the tectonic and topographic configuration of the Appalachian region in eastern North America was most similar to the ________.

Accepted Answer

A) Himalayas and Tibetan Plateau 
B) Andes 
C) Afar Rift 
D) western California

Question 20

Folded, fine grained turbidites that occur high in the Himalayas were originally deposited as sediments ________.

Accepted Answer

A) in the accretionary wedge along the southern edge of Asia 
B) along the shallow shoreline and continental shelf north of India 
C) on the deep ocean abyssal plain south of India 
D) in a massive, Late Paleozoic syncline north of the Tibetan Plateau

Exam 13: Mountain Building and Continental Frameworks

Refer to the geologic province map (fig.13.18)to answer the question(s)below. -What does the Superior craton represent?

An exotic terrane created by a seamount accreted to a continental margin would be composed ________.

Refer to the geologic province map (fig.13.18)to answer the question(s)below. -What does the Trans Hudson Orogen represent?

Intensely folded, thinly bedded, Paleozoic shales and carbonates cause this part of the Canadian Rockies to appear the most jagged and rough due to the easily-eroded shale interbeds.

Refer to the geologic province map (fig.13.18)to answer the question(s)below. -Geochemically and thermally, what was the biggest difference between the early Earth and today?

British Columbia is "accreted terrane central" as it contains more than 39 separate terranes, all accreted during the past 200 million years with the westward motion of North America since the break up of Pangaea.

Adjacent terranes accreted to a continent will generally show similar geologic histories for the time before joining and different geologic histories thereafter.

Fault-block mountains occur in regions dominated by ________ faulting.

Which statement comes closest to describing the isostatic compensation under convergent continental mountain belts?

Which one of the following is an example of an isostatic movement?

A good example of a present-day, passive, trailing, continental margin is the ________.

Which of the following best describes the geology of the Pacific coastal regions of western North America including Alaska?

Turbidite sandstones with graded bedding would be common on continental shelves associated with trailing, passive, continental margins.

Which of the following geologic products or processes is not a result of mountain building?

Thick blocks of crust carried toward a subduction zone ________.

Microcontinental fragments, island arcs, oceanic plateaus and volcanic island chains plus intervening packages of sediments are all commonly accreted in ocean-continent margin settings.

Subduction zones include all of the following except for ________.

According to the Wilson Cycle, continents first break up by forming internal subduction zones that rift them apart and immediately reduce the size of their margins by subducting so much sediment.

During the Late Paleozoic (Devonian through Carboniferous) , the tectonic and topographic configuration of the Appalachian region in eastern North America was most similar to the ________.

Folded, fine grained turbidites that occur high in the Himalayas were originally deposited as sediments ________.