Uranium decay dating
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But even if it is true that older radiometric dates are found lower down in the geologic column, which is open to question, this can potentially be explained by processes occurring in magma chambers which cause the lava erupting earlier to appear older than the lava erupting later.Lava erupting earlier would come from the top of the magma chamber, and lava erupting later would come from lower down.
But at the same time, it will be enriched in the elements contained in the later forming minerals, namely sodium and potassium.A number of processes could cause the parent substance to be depleted at the top of the magma chamber, or the daughter product to be enriched, both of which would cause the lava erupting earlier to appear very old according to radiometric dating, and lava erupting later to appear younger.The following quote from The Earth: An Introduction to Physical Geology by Tarbuck & Lutgens, pp.This age is computed under the assumption that the parent substance (say, uranium) gradually decays to the daughter substance (say, lead), so the higher the ratio of lead to uranium, the older the rock must be.Of course, there are many problems with such dating methods, such as parent or daughter substances entering or leaving the rock, as well as daughter product being present at the beginning.The man's body was recovered and pieces of tissue were studied for their C content by accelerator mass spectroscopy.
The best estimate from this dating technique says the man lived between 33 BC. From the ratio, the time since the formation of the rock can be calculated.55-57, (1987), gives us an idea of the tremendous complexity of the processes that occur when magma solidifies.The general idea is that many different minerals are formed, which differ from one another in composition, even though they come from the same magma.Radiometric dating is largely done on rock that has formed from solidified lava.Lava (properly called magma before it erupts) fills large underground chambers called magma chambers.This calls the whole radiometric dating scheme into serious question.