Radiometric dating basalt. Unreliability of radiometric dating and old age of the earth
What about rocks that are thought not to have their clock reset, or to have undergone later heating episodes?
The global tectonic rock cycle
Potassium is present in most geological materials, making potassium-argon dating highly useful if it really works. These oldest rocks are metamorphic rocks with earlier but now erased histories, so the ages obtained in this way are minimum ages for the Earth.
Because dike swarms are commonly widespread, the conditions determined can often be extrapolated over a broad region. But are dates from mica always accepted, and do they always agree with the age of their geologic period?
In general, when lava cools, various minerals crystallize out at different temperatures, and these minerals preferentially include and exclude various elements in their crystal structures. You have to follow arguments between experts on different issues and see where they go.
A few sources have said that Sr is mobile in rock to some extent. This Speed dating events in gloucester undoubtedly contains a significant amount of argon For example, the rubidium-strontium method would give a valid isotopic age of the biotite sample with inherited argon.
And such flows often have a large internal scatter of dates, but these dates are not considered as anomalies because of the unrestricted biostratigraphic limit. This implies that some of them were originally computed using less accurate values, which is similar to Slusher's point.
The data do not fall on any straight line and do not, therefore, form an isochron.
Lunar mare - Wikipedia
Woodmorappe fails to mention, however, that these data were obtained as part of a controlled experiment to test, on samples of known age, the applicability of the K-Ar method to glauconite and to illite, another clay mineral.
They are part of a continuing effort to learn. Thus it Radiometric dating basalt seem that a large amount of Ar40 was present in the beginning. Perry, in particular, a noted physicists and former assistant to Kelvin, showed that cooling calculations using different but equally likely assumptions and data resulted in ages for the Earth of as much as 29 Ga.
The timing of cycles involving the expulsion of fluids from deep within the crust can be ascertained by dating new minerals formed at high pressures in exposed deep crustal sections.
We also need to know that no parent or daughter has entered or left the system in the meantime.
An exception is the lava from the Hualalai flow, which is so badly contaminated by the xenoliths that it is impossible to obtain a completely inclusion-free sample. Unsourced material may be challenged and removed. It is common, therefore, for multiple layers to form in a single year.
The teacher gave 14 assumptions of radiometric dating and said something like "If creationists got a hold of these, they could cut radiometric dating to pieces.
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