Uranium thorium dating method
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.Without nuclei, we simply would not exist, and it is important to understand why!NUPEX provides a free database of knowledge, created and maintained by expert nuclear physicists from all over Europe.
Geologists assert that older dates are found deeper down in the geologic column, which they take as evidence that radiometric dating is giving true ages, since it is apparent that rocks that are deeper must be older.
However, geologists have found that various eruptive stages of the same volcano often extrude lavas exhibiting somewhat different mineral compositions, particularly if an extensive period of time separated the eruptions.
Evidence of this type led them to look into the possibility that a single magma might produce rocks of varying mineral content. Bowen discovered that as magma cools in the laboratory, certain minerals crystallize first.
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.Plus, the site is extremely easy to use, to encourage pupils to explore the information here on their own.