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Anomalies Creation Science Talk Blog

Various radiometric
dating methods.


Some of the basic Dating Methods are as follows:

  1. Samarium - Neodymium. (Sm-Nd)
  2. Rhenium - Osmium (Re-Os)
  3. Uranium / Thorium - Lead. ( U/Th-Pb)
  4. Ribidium - Strontium (Rb-Sr)
  5. Potassium - Argon (K-Ar)
  6. Argon - Argon (Ar-Ar)
  7. Lutetium - Hafnium (Lu-Hf)

All these methods rely on the changing ratio of  parent or daughter isotopes in a closed system. Now such a closed system does not really exists, but open system affects can't be determined easily, so it is hoped that they about balance out. These methods all have the same basic assumptions.

  1. Constant decay rate.
  2. No gain or loss of parent or daughter isotope.
  3. Known amounts of daughter isotope at start.


 Isochron Dating

PI Parent isotope
DI  Daughter isotope
DE Different isotope of  same 
element as daughter  isotope

Realizing the difficulty of dealing with assumptions #2 and #3 above Isochron Dating was developed in an attempt to solve this problem.

According to theory the sample starts out with daughter isotopes ratio with other isotopes of the same element at a constant value, but with the parent isotope is arbitrary. As a result is forms a strait horizontal line on a graph. As parent decays to daughter, the ratios change and the straight line remains but becomes angled. The slope of the line equals the number of half-lives of the parent isotope has passed sense solidification.

 

 

If there occurs a gain or loss of parent isotope the point moves horizontally. If it is a gain the point moves right. If it is a loss the point moves  left.

 

If a gain or loss of daughter isotope the point moves vertically.  A gain moved the point up and a loss moves the point down.

Take this set of data points.

A shift  from contamination can take place in all of the data points, but such contamination does not affect all data points equally, so it can cause the data points to shift off the true Isochron completely. Given this when one looks at an Isochron plot how can one really tell where the true Isochron line should be. Sufficient contamination can produce any Isochron pattern regardless of the true Isochron.

It is even possible to get a negative slope, this would be equivalent to a negative or future date.

Potassium-Argon and Isochron Ages

When you look at actual  isochron plots such as the ones at above link, there seems to be room for subjectivity. Some are better than others but there is often room for multiple plot lines. Even uniformitarian geologists recognize the existence of false isochron. So how do they distinguish good data from bad? The answer is where the sample fits in the Geologic Column..


An example of a real Isochron


Reconstruction of an isochron from original data at:
New Age Data of Buried Peat Deposits From the Site "Fili Park".


This isochron of the Fili Park peat deposits indicates an age of  89,000 years. This is the  isochron presented by the author of the paper cited above. It a fairly good five point  isochron.



Reconstructed from original data at:
New Age Data of Buried Peat Deposits From the Site "Fili Park".

It is also supported by additional isotope ratios. In addition the data points were the five out of ten samples that "were interpreted to be in the more or less closed-system." However it was concluded that this isochron was the result of contamination as an open system based on the fact that the date was about 50% of the age suggest by the spore and pollen fossils in the deposit. So this other wise good isochron was rejected because it disagreed with the fossils.



Constructed from original data at:
New Age Data of Buried Peat Deposits From the Site "Fili Park".

Even when samples that were originally considered part of an open system are added the result is still a fairly good isochron with only two point showing significant deviation.


Constructed from original data at:
New Age Data of Buried Peat Deposits From the Site "Fili Park".

If the two deviating points are removed the result is an excellent eight point isochron.


Constructed from original data at:
New Age Data of Buried Peat Deposits From the Site "Fili Park".

Further more all ten data points form a fairly good second isotope ratio plot.

The result is that contamination can form good looking isochron data and uniformitarian geolgists know it. The real way a "true" isochron is distinguished from a false isochron is by how well it agrees with how old  the fossils alleged to be.

Reference: New Age Data of Buried Peat Deposits From the Site "Fili Park".


 

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Other Methods

Fission-track dating

Concordia Dating