Message 99 of 155 (752376)
03-10-2015 11:09 PM
What you can see when you open your eyes.
Faith tries dancing but once again it seem she just doesn't know the steps.
Earlier we were discussing evaporite salt beds, ones that are hundreds of feet thick and buried tens of thousands of feet underground.
She tries then to change the subject to "Salt Domes" hoping I guess that no one would notice that she was trying to change the subject. Salt is salt after all.
But it's pretty easy for scientists to tell the difference between a salt bed and a salt dome and they even use two terms so the two are not confused.
The salt bed is laid out over great areas, often really wide areas, often under several states. The beds are horizontal and layered.
Salt Domes (notice it is a different term than salt bed) though are intrusions where salt from a salt bed intrudes into an overlying system, deforming the overlying rocks.
But what is the process, the model, the method, the mechanism involved.
First is the creation of the salt bed. An area is needed where there is an inflow of salt water but a restricted outflow. Water is lost through evaporation until the salt precipitates out. Gradually over time the bed of salt gets thicker. Often, if the salt water inflow is seasonal you get periods when dirt and clay and other minerals blow in on the surface forming the distinctive banding that is seen followed by another cycle of salt formation.
Eventually the bed of salt itself get covered, the inflow get halted, and the whole bed gets covered. We know this because that is what we see. The bed is now buried tens of thousands of feet underground yet for the salt to have formed it must have once been at the surface.
As more and more dirt accumulates over the salt bed it compresses, eventually becoming rock (what type of rock depends on other factors) but is denser than just soil.
Salt though is funny. If you have ever looked at salt under a microscope you know that it forms regular cubes. It is the crystal nature of salt that limits compaction and so it remains less dense than the overlying rock. That means the salt will be more buoyant and will tend to float. The crystal lattice also allows salt to behave as a plastic and to flow. If there is any significant faulting (pretty common, just look at every day's list of earthquakes) the salt can flow vertically as well as horizontally forming intrusions.
It is the intrusions that are termed "Salt Domes" to distinguish the two processes, models, method and procedures.
So science has examined the evidence and has found detailed models, processes, methods and procedures that will produce what is seen in reality.
But they all take time. Not just six thousand years but rather millions or billions of years.
Anyone so limited that they can only spell a word one way is severely handicapped!
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