Potassium argon dating accuracy, other factors affecting carbon dating
We now consider in more detail one of the problems with potassium-argon dating, namely, the branching ratio problem. This shous that they contain some excess argon, and not all of it is escaping. As these rocks absorb argon, their radiometric ages would increase.
Other factors affecting carbon dating
Gentry points out an argument for an instantaneous creation of the earth. The evidence for a strongly increasing change in the cosmic ray influx is most favorable especially in light of the decay of the earth's magnetic field. It is simply that all observations must fit the prevailing paradigm.
The magma deeper down would have come to the surface later, and thus would be nearer to the mid-Atlantic ridge. Furthermore, different types of plants discriminate differently. It is claimed that mixing can often be detected. Thus we can get an apparent correlation of different methods without much of a real correlation in nature.
This will cause them to retain argon and appear too old. Another factor is that rocks absorb argon from the air.
This could account for the observed distribution of potassium-argon dates, even if the great sedimantary layers were laid down very recently. There are some very serious objections to using the potassium-argon decay family as a radiometric clock. Back to top In general, potassium-argon dates appear to be older the deeper one goes in the crust of the earth. And let me recall that both potassium and argon are water soluble, dating a married man who is getting divorced and argon is mobile in rock.
How the carbon clock works
Volcanos typically have magma chambers under them, from which the eruptions occur. This method is important as it allows crystals forming and cooling during different events to be identified. This radius measures the kinetic energy, hence the probability of emission of the corresponding a-particle and also the half-life of the parent nuclide according to the Geiger-Nuttall law. Modern methods of analysis allow individual regions of crystals to be investigated.
Whole rock isochrons may also tend to be wimpy, for the same reason. So a bone, or a leaf or a tree, or even a piece of wooden furniture, contains carbon. The following quote is from the article by Robert H. We can also say that certain formations tend to give reliable dates and others do not, depending on whether the dates agree with K-Ar dates.
And even for this one, the results were not very good. And quite a few other dates are often much, much farther off. My reasoning was that if the lava is thoroughly mixed, then the concentration of parent material should be fairly constant. It makes no sense at all if man appeared at the end of billions of years. The sea is not nearly salty enough for this to have been happening for billions of years.
There are two sources of lava, A and B. Most of the early studies of pleochroic haloes were made by Joly and Henderson. Wise, letter to the editor, and replies by M. But if we really understand what is going on, then we should be able to detect discrepant dates as they are being measured, and not just due to their divergence from other dates. It takes a long time to penetrate the confusion and find out what is the hard evidence in this area.
Other radiometric dating methods There are various other radiometric dating methods used today to give ages of millions or billions of years for rocks. Dating minerals may provide age information on a rock, but assumptions must be made. Testing radiometric dating methods If the long-age dating techniques were really objective means of finding the ages of rocks, they should work in situations where we know the age. Another currently popular dating method is the uranium-lead concordia technique. This statement is made so often as evidence for the reliability of radiometric dating, that the simple evidence that it has no meaning, is astounding to me.
It's also possible for other matter to be incorporated into lava as it rises, without being thoroughly melted, and this matter may inherit all of its old correlated radiometric dates. Human judgment could determine whether points were collinear enough to form an isochron.