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Isochron dating process

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One thing that should be made clear from the beginning: The age of a rock is really just a measure of how long it has been since the rock cooled to become a rock, not how long the material has been around. If you take any rock, melt it, and let it cool back to a rock, it will be a new rock with its age clock reset to zero years old. You should keep this in mind when we are talking about determining the age of rocks. A more relevant example: Let us say that a rock is sitting on the surface of the Moon. A billion years after that rock was formed, the rock is covered and remelted by a lava flow. Two billion years after the lava flow that rock is uncovered by an impact and thrown to the surface.
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Watching a Rock Age on an Isochron Diagram

Isochron dating process
Isochron dating process
Isochron dating process
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Rock Formations

Geological Science a line on an isotope ratio diagram denoting a suite of rock or mineral samples all formed at the same time. The slope of the line is related to the age of the rock or mineral suite. Geological Science a line or curve on a geological map or cross section esp of oceanic crust connecting points of identical age. Mentioned in? References in periodicals archive? The isochron from the demand point is drawn by using ArcGIS space analysis technology based on the walking time and concept of isochron.
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Lead–lead dating

Radioactive decay has become one of the most useful methods for determining the age of formation of rocks. However, in the very principal of radiometric dating there are several vital assumptions that have to be made in order for the age to be considered valid. These assumptions include: 1 the initial amount of the daughter isotope is known, 2 neither parent or daughter product has migrated into, or out of, the closed rock system, and 3 decay has occurred at a constant rate over time.
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The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth. The equation is the one which describes radioactive decay:. Solving the equation for "age," and incorporating the computation of the original quantity of parent isotope, we get:.
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