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 ________.