Both kinds of processes can influence radiometric dates. The right branch of the reaction series is a continuum in which the earliest formed calcium-rich feldspar crystals react with the sodium ions contained in the melt to become progressively more sodium rich. In other words, mantle is not the direct source of magma. If I have a rock X with lots of uranium and lead daughter isotope, and rock Y with less of both relative to non-radiogenic lead , then one will get an isochron with a positive slope. All of the different dating methods agree--they agree a great majority of the time over millions of years of time. This process will generate an igneous rock of yet another composition. But what is this age based on? So this is a valid mixing, and we are done. I now show that the mixing of three sources can produce an isochron that could not be detected by the mixing test. By analogy with the behaviour of Ra, Th and U it can be suggested that Pb, owing to its large mobility, was also fed to the magma by fluids. The issue of the "uniformitarian" assumption is discussed in significantly greater detail at Uniformitarian. But it could be measuring the apparent age of the ocean floor or crustal material rather than the time of the lava flow. This belief in long ages for the earth and the existence of life is derived largely from radiometric dating. Carbon is supposed to allow dating of objects up to 60, years. If there is a proof that this could not be so, then I have missed it. This can happen, for example, if the earlier formed minerals are heavier than the liquid portion and settle to the bottom of the magma chamber as shown in Figure 3.
On the other hand, calcium carbonates produced biologically such as in corals, shells, teeth, and bones take in small amounts of uranium, but essentially no thorium because of its much lower concentrations in the water. The chemistry of uranium and thorium are such that they are in fact easily removed from each other. Mechanisms that can alter daughter-to-parent ratios What happens when magma solidifies and melts and its implications for radiometric dating The following quote from The Earth: This is actually a good argument. This can and must be tested. These would also tend to have high dipole moments. This high melting point suggests that uranium would crystallize and fall to the bottom of magma chambers. Because God's universe is so large, images from distant events take a long time to get to us. Let me suggest how these processes could influence uranium-lead and thorium-lead dates: Such a high melting point would imply fractionation in the magma. These methods assume that the distribution of index fossils and the correlation of strata are well understood on a global scale. And each of these 30 cases is fairly well understood -- none of these is truly "mysterious" [ Wien ]. However, more recent work has indicated that this process cannot account for the relative quantities of the various rock types known to exist. We now have so many things that can make radiometric dating go wrong, and isochrons don't remedy the situation at all, that I think the weight of evidence of radiometric dating is nullified. The same is true of coal which was supposedly deposited hundreds of millions of years ago, according to the evolutionary model. Also, John Woodmorappe's paper has some examples of anomalies involving zircons. By analogy with the behaviour of Ra, Th and U it can be suggested that Pb, owing to its large mobility, was also fed to the magma by fluids. Anyway, this also reduces the number of data points obtained from isochrons. This can result in dates being inherited from magma into minerals. Radiometric dating is based on the fact that radioactive isotopes decay to form isotopes of different elements. Both long-range and short-range dating methods have been successfully verified by dating lavas of historically known ages over a range of several thousand years. If the heating occurs in a laboratory furnace equipped with a very sensitive light detector, this light can be recorded. The whole-rock and separated mineral samples allow a method known as isochron dating to be done. I would not want to use a scale that might be right and might be wrong. The age will not even depend on how much crust is incorporated, as long as it is non-zero. The mathematics for determining the ages from the observations is relatively simple.
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