Exam 13: Mountain Building and Continental Frameworks

Mountain belts formed from folded marine sediments by continent-continent collision, include ________.

Most of mainland Alaska, over half of B.C.and the Yukon, and most of Washington, Oregon, Nevada and California are ________.

Terrane accretion generally occurs along a divergent boundary between a continental plate and an oceanic plate.

The concept of ________ includes the idea that crustal rocks are floating in a kind of gravitational balance and that their elevation depends on their density contrast to the underlying upper mantle.

All mountain belts are produced by some form of orogenesis.

How were the Ural Mountains (Russia)formed?

Considering the dynamics at convergent plate boundaries where subduction is occurring, how would the angle of the subducting plate (as measured from horizontal)influence the geographic location of the associated volcanic arc? Also, if the angle of a subducting plate changed over time, how would this be expressed by the spatial distribution and ages of volcanic rocks produced by the subduction zone?

Which mountain belt did not have a stage of continent-continent collision as it formed?

What was the name of the ocean basin that was created and destroyed in the Wilson cycle that built the Appalachian orogen?

The ________ of the Appalachian orogen consists of North American, continental shelf strata deposited prior to the late Paleozoic collision with Gondwanaland (Africa).

________ refers to the floatational balance achieved between the thickness and elevation of crustal or lithospheric rocks and that of the deeper mantle.

Active volcanic arcs above a young oceanic plate are associated with a(n)________ margin.

What must happen to a region of crust for it to undergo a dramatic change in elevation?

Mountainous relief is due to the rotation and sinking of lithospheric blocks in a ________ tectonic setting.

Ophiolites, like at Thetford Mines Quebec, can provide economic deposits of chrysotile asbestos.

What are two different ways or forms for ocean crust to be added to a continental margin?

Refer to the geologic province map (fig.13.18)to answer the question(s)below. -What do the 1.8 to 1.7, 1.7 to 1.6, and Grenville belts represent?

Whether or not there are active tectonic forces in play, eroding mountain areas will always experience ________.

As thrusting builds up the elevation of a mountain belt, isostasy helps elevate the base of the crust at the same time.

The most likely place for a high temperature metamorphic belt along an Andean margin is among the volcanic debris and deformed accretionary wedge materials over the oceanic slab.