Isochron Dating Problems

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Key Flaw Found in Radioisotope Isochron Dating | Answers . . .
Problems with Isochrons
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Isochron Rock Dating Is Fatally Flawed
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Furthermore, the isochron method is claimed to overcome other problems with the assumptions involved in all radiometric dating techniques .6 The theory of isochron dating goes like this . At time zero when the rock unit formed (for example, the granite body crystallized and cooled), the samples of it had different numbers of parent 87 Rb atoms in them .
Problems with Isochrons . The isochron technique of radiometric dating is often presented as overcoming problems with earlier methods . However, it is easy to imagine scenarios that could cause isochrons to yield false daates, and geologists recognize that isochrons can yield bad dates . The idea of isochrons is this: Suppose X is a parent element . . .
apps .usd .edu › esci › creation › age › content › current_scientific_clocks › isochron_dating .html
The problem with the isochron , then, is that the date being calculated is not the date that the rock was initially formed, but the date that it re-homoginized and re-crystallized to its current state .
www .talkorigins .org › faqs › isochron-dating .html
Potential problems for generic dating ; Isochron methodology . Why isochron data are colinear; Miscellaneous notes; Avoidance of generic dating's problems . Initial daughter product; Contamination - parent isotope; Contamination - daughter isotope; Exceptions for loss of daughter; So, are isochron methods foolproof? Violation of cogenetic requirement
ISOCHRON ROCK DATING IS FATALLY FLAWED . Radiometric rock dating , the methodology of determining the date of formation of a rock sample by the well-established rate of decay of the isotopes contained, depends on accurately determination of the starting points, the original concentrations of the isotopes .
The isochron is supposed to take care of such issues . Essentially, rather than looking at the amounts of Rb-87 and Sr-87, we look at their ratios compared to Sr-86 . The ratio of Sr-87 to Sr-86 is graphed versus the ratio of Rb-87 to Sr-86 for several different parts of the rock .
Some of the problems associated with K-Ar dating are Excess argon . This is only a problem when dating very young rocks or in dating whole rocks instead of mineral separates . Minerals should not contain any excess Ar because Ar should not enter the crystal structure of a mineral when it crystallizes .
detectingdesign .com › radiometricdating .html
Also, the various isochron dating systems seem to eliminate the problem of not knowing how much daughter element was present when the rock formed . Isochron dating is unique in that it goes beyond measurements of parent and daughter isotopes to calculate the age of the sample based on a simple ratio of parent to daughter isotopes and a decay . . .
First, the various isotope combinations used in the isochron method of dating are clearly discordant—they do not produce the same age for a given rock formation . 5 Second, the isochron method gives erroneous ages for rock formations of known age . 6 Specifically, rocks gathered from recently erupted Mt . Ngauruhoe in New Zealand gave a K-Ar date of 270,000 to 3 .5 million years, a Rb-Sr date of over 133 million years, a Sm-Nd date of nearly 200 million years, and Pb-Pb dates of 3 .9 billion . . .
Thus, there apparently ARE some problems in that kind of radiometric dating . General unreliability of radiometric dating The main point at issue is fractionation and its relationship to U/Pb and Th/Pb dating . Jon Covey cited some references about this, and it will take a lot of work to understand what is going on from a creationist viewpoint .
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Isochron Dating Problems