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20 Cards in this Set
- Front
- Back
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Delta progrades
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builds the land surface forward into what was formerly the sea
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Compaction
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Mud deposited is 80% water, which gets squeezed out
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Isostatic adjustment
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dumping of sediment on the earth's crust imposes huge load, which causes the area to sink under its own load.
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Delta lobe
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local prograding sediment deposit
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Delta Cycle
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Growth
Abandonment Subsidence Reoccupation Renewed deposition |
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Prodelta
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Offshore deposit in front of the delta plain.
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Muddy Mississippi River water mixes with salty GoM water and transform into _____.
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shale
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Strike-fed depositional system
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the shoreline is horizontal and the activity of gravity in sediment transport is less straightforward than in a dip-fed system.
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Water movement at wave base
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the circular movement is reduced to a point ( no motion)
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At contact between the water and teh bottom, the elliptical water movement is just a ___ back-and-forth motion of both the ____ and ____ being dragged along.
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linear, water, sediment
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Wave action is responsible for
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distributing sediment laterally along a coast.
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longshore drift
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sand "walks" in a sawtooth manner along the beach.
in this manner, sand can be transported hundreds of meters in a day. |
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Deltas do not form into the gulf because
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Prevailing winds directed landward off the Gulf distribute sand.
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When GoM began to rift
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intense evaporation caused deposition of gypsum and halite
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Salt
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low-density, incompressible, mechanically weak, easily deformed
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Salt domes are located in
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Northeast TX, under the coast, and a parallel band offshore
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growth fault
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displacements at same time as sediment on either side of the fault were accumulating
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difference between conventional faults and growth faults.
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movement along growth faults and deposition of sediment proceed simultaneously
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Growth faults are ______.
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not sites of earthquakes
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Movement along growth faults
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movement is a constant slow creep, not sudden jolt of earthquake
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