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...
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Extinct Arc - Answer-A chain of no longer active volcanic activity, typically in a curved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.
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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