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We have analyzed several devitrified glasses of known age, and all have yielded ages that are too young. A higher ratio means an older age. Determination of sequence Relative geologic ages can be deduced in rock sequences consisting of sedimentary, metamorphic, or igneous rock units. Argon from the environment may be trapped in magma by pressure and rapid cooling to give very high erroneous age results. Dikes and lava, now exposed on either side of Baffin Bay , have been dated to determine the time when Greenland separated from North America—namely, about 60 million years ago. Sample sizes range from less than 0. 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. If a rock dates too old, one can say that the clock did not get reset. Igneous rocks are particularly suited to K-Ar dating. In this situation, fragments of the host rock must be found within the intrusive body to establish its relatively younger age. I mentioned a number of possibilities that could cause K-Ar dates to be much older than the true ages of the rocks. Here the dikes must be younger than all other units. This is when the dinosaurs are assumed to have become extinct. It may also be that lava is produced by melting the bottom of continents and successively different layers are melted with time, or there could be a tendency for lighter isotopes to come to the top of magma chambers, making the lava there appear older. Concerning excess argon, Faure , p. Many sedimentary uranium ores are not.
In general, in one half-life, half of the parent will have decayed. They noted, 'The solubility of Ar in the minerals is surprisingly high'. Some geochronologists believe that a possible cause of excess argon is that argon diffuses into mineral progressively with time. The reason for my request is that a correlation is not implied by the fact that there are only 10 percent anomalies, or whatever. So this argon that is being produced will leave some rocks and enter others. Oscillation ripple marks, for example, are produced in sediments by water sloshing back and forth. So a rock can get a very old radiometric age just by having average amounts of potassium and argon. Similarly, in geologic studies, vast quantities of information from widely spaced outcrops have to be integrated. The relationship between the data obtained and a specific event must be known. A wrought-iron Roman cleaver. Perhaps the earth was made from older pre-existing matter, or perhaps decay rates were briefly faster for some reason. Thus they would have hardened with a lot of argon inside. In certain places, the fault planes are only a few centimetres thick and are almost impossible to detect. The geochronologist considers the Ca40 of little practical use in radiometric dating since common calcium is such an abundant element and the radiogenic Ca40 has the same atomic mass as common calcium. One factor that can upset the law of superposition in major sediment packages in mountain belts is the presence of thrust faults. Also, as the rock deforms under pressure, more cracks are likely to form and old ones are likely to close up, providing more opportunity for argon and other gases to enter. Writer Lavina Melwani described a happy marriage which had been arranged by the bride's father, and noted that during the engagement, the woman was allowed to go out with him before they were married on only one occasion; the couple married and found happiness. This of course means that the result is no longer anomalous, because the geologic period has been modified to fit the date. This could happen because of properties of the magma chambers, or because of argon being given off by some rocks and absorbed by others. And Harold Coffin's book Creation by Design lists a study showing that Rb-Sr dates are often inherited from the magma. However, this causes a problem for those who believe based on the Bible that life has only existed on the earth for a few thousand years, since fossils are found in rocks that are dated to be over million years old by radiometric methods, and some fossils are found in rocks that are dated to be billions of years old. For example, one isochron yielded a date of 10 billion years. The difficulties associated are numerous and listed as follows: Ground-water and erosional water movements could produce this effect naturally. Corroded iron from the Java Sea Wreck. Slusher asserted that the best known value of the branching ratio was not always used in computing K-Ar radiometric ages.
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