At equilibrium, which should be attained in , years for this decay series, we should expect to have 3 million times as much U as radium to equalize the amount of daughter produced. But anyway, let's suppose we only consider isochrons for which mixing cannot be detected. I suspect that a number of geologists now realize the implications of what they know about the lead and uranium content of subducted oceanic plate versus crustal material and the mechanics of magma solidification. Some radiometric dating methods depend upon knowing the initial amount of the isotope subject to decay. I'd like to know how often this happens, in any case, especially on the geologic column of Cambrian and above. With a wristwatch you check with a different clock, with radiometric dating the checks are with different dating methods and different isotope pairs. Anomalies and other objections that have been raised by creationists are dealt with in detail in Roger Wiens' article [ Wien ], Mark Isaak's book [ Isaak , pg. Usually it involves using more than one sample from a given rock. However, more recent work has indicated that this process cannot account for the relative quantities of the various rock types known to exist. Fission tracks and electron spin resonance is dependent on the rate of decay of isotopes.
Nevertheless, it has been maintained that the method has been verified beyond any question by numerous correlations with known dates. Such small uncertainties are no reason to dismiss radiometric dating. But numerous experiments have been conducted to detect any change in radioactivity as a result of chemical activity, exceedingly high heat, pressure, or magnetic field. The problems are compounded because many of the parent and daughter substances are mobile, to some extent. This source already had both rubidium and strontium. It depends how fast it happened. However, there are numerous examples, but I only have limited space on this forum. This newly-pointed-out flaw in the isochron method is a stark reminder of that. Responses to specific creationist claims Wiens' online article, mentioned above, is an excellent resource for countering claims of creationists on the reliability of geologic dating. Geochronologists use the branching ratio as a semi-emperical, adjustable constant which they manipulate instead of using an accurate half-life for K Such a distribution would give the appearance of age. They have measured He diffusion rates from Zircons that are supposedly 1. Let me clarify the problem with excess argon. In fact, if a rock can absorb only a ten millionth part of argon, that should be enough to raise its K-Ar age to over million years, assuming an average amounts of potassium. These processes correspond to changing the setting of the clock hands. Field and laboratory observations and experiments have shown that the resetting and changing in specimen clocks can and does happen. So all of the scenarios given before can also yield spurious isochrons. A pioneering investigation into the crystallization of magma was carried out by N. Micas exclude strontium, so Rb-Sr dating can be used on micas to determine the length of time since the mica formed. That was written in For example, zircons are thought to accept little lead but much uranium. Then from mixing, one can produce an isochron having a spurious age. So it is logical to conclude that if recent lava flows of known age yield incorrect old potassium-argon ages due to the extra argon that they inherited from the erupting volcanoes, then ancient lava flows of unknown ages could likewise have inherited extra argon and yield excessively old ages. Potassium-Argon and Argon-Argon Methods Both these methods suffer from the same problems, because they are both based on the radioactive decay of potassium K to argon Ar , a gas which does not bond with other elements. We can assume that the Precambrian rocks already existed when life began, and so the ages of the Precambrian rocks are not necessarily related to the question of how long life has existed on earth. How radiometric dating works in general Radioactive elements decay gradually into other elements. One must suppose that trees grew exponentially slower in the past, and so forth, to produce exactly the same errors as the error he supposes.
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