Video about how reliable are radiometric dating methods:
Reliability of Radiometric Dating - by Hugh Ross
In the special case where the isochron line has a zero slope indicating zero age , then gain or loss of P may move the data points, but they will all still fall on the same horizontal line. The geochronologists credit this to "argon leakage". I found the following statement in an on-line non creationist reference, as follows: If something were seriously wrong with the current geologic time scale, one would expect inconsistencies to grow in number and severity, but they do not. If geological tests are not being applied consistently, one wonders what value they have. The principle of inclusion - a structure that is included in another is older than the including structure. It had been noted that some minerals which yield such dates as beryl, cordierite, etc. Because cosmic rays constantly bombard meteorites flying through space, this method has long been used to date the ' flight time' of meteorites--that is the time from when they were chipped off a larger body like an asteroid to the time they land on Earth. TL dating and its related techniques have been cross calibrated with samples of known historical age and with radiocarbon and thorium dating. The same goes for extrusive flows on the surface, since argon would be filtering up through the earth and through the lava as it cooled. They also pointed out that for the anomalies to be accounted for by excess argon, unreasonably high partial pressures of Ar during crystallization would have to be required. A number of historical eruptions as far back as Vesuvius nearly 2, years ago serve as benchmarks with which to determine the accuracy of the yearly layers as far down as around meters. Such situations occur mainly where old rocks have been locally heated, which released argon into pore spaces at the same time that new minerals grew. What change does this have on uncalibrated carbon ages?
These rocks were dated at up to 3. The assumption that there has been no loss or gain of the isotopes in the rock assumption 2 does not take into account the impact of weathering by surface and ground waters and the diffusion of gases. The layers of sediment are up to meters thick and were supposedly laid down one layer at a time each year. Igneous rocks are particularly suited to K-Ar dating. A Triassic, Jurassic and Cretaceous time scale. The geological time scale and the techniques used to define it are not circular. The rapid cooling might mean that any enclosed argon is retained, but if not, the fact that this cooling occurs near the volcano, with a lot of argon coming out, should guarantee that these beads would have excess argon. For rocks that are being dated, contamination with atmospheric argon is a persistent problem that is mentioned a number of times. If those rocks were over a billion years old, as evolutionists claim, the helium should have leaked out of the rock. This may be explained by the different parent atoms having decayed at different rates in the past—an explanation not allowed by evolutionists. Furthermore, it is possible that the craters were chosen as those for which the dating methods agreed. There are many other methods that can be used to establish ages for parts of the earth and the solar system. The rates of exchange that would mess up the dates are very tiny. This is supported by the presence of large amounts of helium in some minerals. It is possible that such isochrons are not often done. So a number of applications of the thorium method are based on this chemical partition between uranium and thorium. Often values for constants are standardized, so that the values actually used may not be the most accurate known. The original element is called the parent, and the result of the decay process is called the daughter element. Only rarely does a creationist actually find an incorrect radiometric result Austin ; Rugg and Austin that has not already been revealed and discussed in the scientific literature. Some of these events do exist. Because it would take an extremely elaborate scheme to make up his existence, including forgeries, fake photos, and many other things, and besides, there is no good reason to simply have made him up. The check is not just the isochron plot itself which can in most cases indicate such a problem by failure of the data to fall on a line , but in addition the physical location and geological relationships of the samples selected for dating. Porig - The quantity of the parent isotope that was originally present. This document is partly based on a prior posting composed in reply to Ted Holden. Fundamental to stratigraphy are a set of simple principles, based on elementary geometry, empirical observation of the way these rocks are deposited today, and gravity. Here are the numbers they applied to the geological boundaries in this interval, compared to the numbers in the newer studies:
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