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Stages of Mountain Building
Transcript of Stages of Mountain Building
Team Hawking: Castro, Delfin, Lirios, Dedoroy, Verceles
Today, we know that mountains built by internal processes through geologic time. These mountain-building processes are triggered by geothermal heat generated by radioactive decay in Earth's interior.
Accumulation of Sediments
accumulated igneous rocks and sediments that can reach up to several kilometer in thickness
these rocks and sediments came from nearby terrestrial landmasses; and
transported through weathering and erosions
Period of Crustal Uplift caused by Isostatic Rebound and Block-Faulting
Occurs at the end of the plate convergence;
Crustal uplift occurs due to
crust will then sink
until it reaches its buoyancy point;
If anything changes the load or crust, isostatic rebound occurs, and the
crust rises back
after a geologic time;
Surface materials from the mountains are removed (erosional forces), allowing the
weight of the crust
in this region to become
Tensional forces exist in a horizontal direction and breaks the continental crust into pieces of smaller rocks;
fault block moves vertically
at different orientations;
normal and graben faults
Orogenic Period of Rock Deformation and Crustal Uplift
refers to forces and events leading to a large structural deformation of the Earth's lithosphere (crust and uppermost mantle) due to the interaction between tectonic plates.
PERIOD of ROCK
PERIOD of CRUSTAL UPLIFT caused by ISOSTATIC REBOUND and BLOCK-FAULTING
Orogens or orogenic belts develop when a
continental plate is crumpled and is pushed upwards
to form mountain ranges, and involve a
great range of geological processes
3 types of Tectonic Converges:
: when an island arc collides with the edge of a continental plate;
Zones of arc-continent collision are producers of much of the world's minerals, so understanding processes that take place during these tectonic events is of importance in modeling how this mineral wealth is formed and preserved.
An example is the arc continental collision in Taiwan.
: when ocean and continental plates allow the accretion of marine sedimentary deposits to the edge of the continent;
Where the two plates meet, the denser oceanic lithosphere is forced down and under the more buoyant continental lithosphere, descending at an angle into the mantle in a process called subduction.
An example is the Andes Mountains in the South American boundary and a small part of Pacific Ocean's boundary.
: when an ocean basin closes and two continental plates collide;
Continental collision is a variation on the fundamental process of subduction, whereby the subduction zone is destroyed, mountains produced, and two continents sutured together.
An example of this is found at the boundary between the South American continental plate and the Nazca oceanic plate.
: exhibit when a crust bends the lithosphere into the asthenosphere, causing the lower layer to flow out of the way
: when the weight decreases, the continental crust makes an isostatic adjustment, causing it to float higher in the mantle.