Geography, 26.06.2020 15:01, pc103919

Lesson 7 - Describe radiometric dating and discuss three prerequisites that must be met in order to obtain a reliable radiometric date on a granite batholith. What are the various methods of radiometric dating that may be used

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RADIOMETRIC DATING can also be seen as the way of determining the particular time in which materials were been formed by studying the decay of the radioactive isotopes that exist in the material, which is why RADIOMETRIC DATING is reliable because the rates of decay for many types of isotopes do not vary.

3 PREREQUISITE

1. The rate of decay must remain constant and must not vary.

2. The amount of parent and daughter must as well remain completely precise.

3. Lastly the granite would as well have to have stayed a closed system for the whlle period of time following when it was created

METHOD OF RADIOMETRIC DATING

1. The potassium argon dating

2.Uranium lead dating

Explanation:

REDIOACTIVE DATING can be defined as the method in abundance ratio of a radioactive isotope is been compared to a reference isotope in order to help determine the actual age of a material and this is done measuring the decay of radioactive atoms to effectively determine the age of a rock sample.

In other word RADIOMETRIC DATING can also be seen as the way of determining the particular time in which materials were been formed by studying the decay of the radioactive isotopes that exist in the material, which is why RADIOMETRIC DATING is reliable because the rates of decay for many types of isotopes do not vary.

Therefore in order for to obtained a reliable radiometric date for a granite batholith, their are three prerequisites which must be followed and they are :

1. The rate of decay must remain constant and must not vary.

2. The amount of parent and daughter must as well remain completely precise.

3. Lastly the granite would as well have to have stayed a closed system for the whlle period of time following when it was created .

Some of the various methods of RADIOMETRIC DATING include;

1. The potassium argon dating

2.Uranium lead dating

Below is the formula for RADIOMETRIC DATING

log F = (N/H)log(1/2)

Where F is the fraction remaining

N is the number of years

H is the half life.

In order to determine the fraction remaining we have to know the particular amount which is now present as well as the amount which was present at the time when the mineral was been formed.

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Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust.