mountains part ii domed and fault-block
DESCRIPTION
Dome Mountains Created when magma pushes up from underneath existing strata and cools.TRANSCRIPT
Mountains Part II Domed and Fault-Block Dome Mountains Created
when magma pushes up from underneath existing strata and cools.
Associated features: A sill is an igneous intrusion that squeezes
in between existing rock layers Goes parallel to the layers The
cliff band on Triangle Mtn is a sill A dike is similar but cuts
across the existing rock strata The belt on Mt Daly is a dike
Intrusive Magma: Batholiths are large bubbles of magma (usually
felsic) that cool underground. Forms Tectonic Domes Smaller bubbles
are called Laccoliths- usually a sill that has bulged upwards.
Forms Plutonic Domes Stock> Domed mountains create:
Cuestas Hogback ridges Flatirons Watergaps Stocks Dike Dike Sopris
is NOT a volcano- Its a stock! Mtn Sopris = Stock Flat Irons-
Boulder - closest = Grand Hogback near Rifle
Hogback- front range - closest = Grand Hogback near Rifle Henry
Mtns- laccolith Cuesta- Horse tooth Reservoir Historic photo of the
Grand Hogback- New Castle How to tell the difference between a
folded and a domed mountain?
If the mountain is folded, the underlying rocks will be either
sedimentary or metamorphic If the mountain is domed, then the rocks
below will be igneous (intrusive/plutonic) Fault-Block Mountain
Fault Block Mtns Formed from blocks of crust that have been faulted
and tilted at the same time. Red Butte Sangre De Cristos Tetons
Sierra Nevada Wasatch Mountains Joints Rock layers may rupture from
pressure applied.
Fractures where no movement has occurred are called joints, Faults
Faults are fractures in the earths crust where movement has
occurred. There are three types: normal, reverse or thrust, and
strike-slip (also called transcurrent). Teton Mountains The Tetons
in Wyoming have been uplifted along a fault plane. Basin and range
Mountain Ranges Mountain ranges are formed when long belts of the
earths crust are folded and/or faulted then are uplifted and
eroded.The Rockies are an example. Erosion When a section of the
earths crust is elevated, streams begin to erode deep channels. Can
form mountains also. Capstones Resistant layers help to produce
mesas, buttes, and pinnacles. Earthquakes Earthquakes occur due to
movement along faults. Lake Baikal-. -deepest lake in the world.
-5,315 feet deep
Lake Baikal- -deepestlake in the world -5,315 feet deep -contains
1/5 of all the worlds freshwater Lake Tahoe