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Geology GE2000 Exam 2 MTU Questions with Answers

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Geology GE2000 Exam 2 MTU Questions with Answers Geologic Structures - Answer-Brittle and Ductile Structures Brittle Structures - Answer-joints and faults Ductile Structures - Answer-folds geologic joints - Answer-fractures in rock where no movement has occurred tensional stress - Ans...

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  • August 6, 2024
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  • 2024/2025
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Geology GE2000 Exam 2 MTU Questions
with Answers

Geologic Structures - Answer-Brittle and Ductile Structures

Brittle Structures - Answer-joints and faults

Ductile Structures - Answer-folds

geologic joints - Answer-fractures in rock where no movement has occurred

tensional stress - Answer-geologic joints result from ___ (tectonic or thermal)

joint types - Answer-perpendicular joint planes, parallel joint set, columnar jointing

columnar jointing in a lava flow - Answer-result from contractional cooling stresses

faults - Answer-brittle fractures in rock upon which movement (slip) has occurred

footwall block - Answer-the block of rock that lies beneath a fault plane

hanging wall block - Answer-the rock surface immediately above a fault

normal fault - Answer-results from tensional stresses, the hanging wall slips down
relative to the footwall

reverse fault - Answer-results from compressional stresses, the hanging wall moves up
relative to the footwall

thrust fault - Answer-a low angle (<20 degrees) reverse fault

large crustal sheets - Answer-Thrusts are often

Chief Mt. - Answer-remnant of hanging wall block

Strike-slip fault - Answer-results from shearing stresses (right or left lateral)

Oblique-slip faults - Answer-faults that have both vertical and lateral movement

fold - Answer-Bend or warp in layered rocks results from compressional or shear stress
(ductile behavior)

, Anticline fold - Answer-concave downward

Syncline fold - Answer-concave upward

monocline fold - Answer-is a step-like fold in rock strata consisting of a zone of steeper
dip within an otherwise horizontal or gently-dipping sequence.

non-plunging fold - Answer-Fold axis is horizontal

plunging folds - Answer-Fold axis is not horizontal

Sheep Mt, WY - Answer-Plunging anticline

Mountain belts/orogens - Answer-a mountain building event called an orogeny. Ex.
Larmide Orogeny & Penokean Orogeny

plate tectonics - Answer-Mountain building and deformation of rocks is closely related to
___.

Incoming exotic terrane - Answer-a piece of the Earth's crust that has merged with
another landmass that usually has a separate and entirely different geologic history

active accretionary prism - Answer-series of steeply inclined, fault-bounded wedges of
sediment and volcanic rocks above a descending slab

active arc - Answer-ridges of recent volcanoes with an associated deep seismic zone

Older accreted terrane - Answer-a piece of the Earth's crust that has merged with
another landmass that is by an active arc~

suture - Answer-a joining together along a major fault zone, of separate terranes,
tectonic units that have different plate tectonic

Extinct Arc - Answer-A chain of no longer active volcanic activity, typically in a curved
pattern, rising from a subduction zone

fold-thrust belt - Answer-when plate movements push the contingent tightly against the
subduction zone, compression on the continent side of the volcanic arc generates a
____. In such belts, a thrust-fault system has developed above a nearly horizontal
detachment fault, and folds form as strata are pushed up from the fault.

Collision mountains - Answer-Continental crust -> ^ <-

Rifting mountains - Answer-fault blocks appear to rise up as mountains, the rift valleys
are really sinking, this can occur over a narrow or wide region

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