Isochron dating problems

isochron dating problems

Are the results of isochron dating random?

The large majority of isochron dating results are in accordance with the mainstream age and history of the Earth. If the results were essentially random numbers, that would not be the expected distribution of results. See the tables of meteorite isochron ages in The Age of the Earth FAQ for example.

What are the requirements for isochron dating?

One of the requirements for isochron dating is that the samples be cogenetic, meaning that they all formed at about the same time from a common pool of material in which the relevant elements and isotopes were distributed reasonably homogeneously. (As described in Figure 4, this is how the data are caused to be colinear.)

What is the ratio of daughter isotopes in isochron dating?

Instead of using the initial quantity of daughter isotope, the ratio of daughter isotope compared to another isotope of the same element (which is not the product of any decay process) is used as the comparison for isochron dating.

What is isochron age uncertainty?

Age uncertainty. An additional nice feature of isochron ages is that an uncertainty in the age is automatically computed from the fit of the data to a line. A routine statistical operation on the set of data yields both a slope of the best-fit line (an age) and a variance in the slope (an uncertainty in the age).

What is the isochron dating method?

The isochron method Many radioactive dating methods are based on minute additions of daughter products to a rock or mineral in which a considerable amount of daughter-type isotopes already exists. These isotopes did not come from radioactive decay in the system but rather formed during the original creation of the elements.

What is the difference between isochron dating and extinct radionuclides?

However, methods using extinct radionuclides give only relative ages and have to be calibrated with radiometric dating techniques based on long-living radionuclides like Pb-Pb dating to give absolute ages. Isochron dating is useful in the determination of the age of igneous rocks, which have their initial origin in the cooling of liquid magma.

What is the ratio of daughter isotopes in isochron dating?

Instead of using the initial quantity of daughter isotope, the ratio of daughter isotope compared to another isotope of the same element (which is not the product of any decay process) is used as the comparison for isochron dating.

Can an isochron diagram give a valid age?

An isochron diagram will only give a valid age if all samples are cogenetic, which means they have the same initial isotopic composition (that is, the rocks are from the same unit, the minerals are from the same rock, etc.), all samples have the same initial isotopic composition (at t 0 ), and the system has remained closed .

What is the initial condition for isochron dating?

3) The initial condition must be known. In this case, the initial condition is the amount of daughter isotope in the rock when it was formed. This amount is often unknown and is one of the downfalls of conventional radiometric dating. However, isochron dating bypasses this assumption, as explained below.

What is the difference between isochron dating and extinct radionuclides?

However, methods using extinct radionuclides give only relative ages and have to be calibrated with radiometric dating techniques based on long-living radionuclides like Pb-Pb dating to give absolute ages. Isochron dating is useful in the determination of the age of igneous rocks, which have their initial origin in the cooling of liquid magma.

Is the isochron date correct for accelerated decay?

They propose that decay rates have been accelerated on several occasions, so that the isochron date given is correct for the amount of decay that has occurred, but the time that has elapsed is not the same as the age given.

Can an isochron diagram give a valid age?

An isochron diagram will only give a valid age if all samples are cogenetic, which means they have the same initial isotopic composition (that is, the rocks are from the same unit, the minerals are from the same rock, etc.), all samples have the same initial isotopic composition (at t 0 ), and the system has remained closed .

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