Isochron dating methods yabb
The big surprise is that the attack has come from an evolutionary geologist and has been published in a secular scientific journal! First, let’ s find out how radioactive dating methods are supposed to work.
Some types (technically known as ‘isotopes’) of ‘parent’ elements such as uranium, thorium, potassium and rubidium are said to be radioactive because the nuclei of the atoms are unstable, resulting in readjustments between the ‘particles’ (primarily neutrons and protons) in the nuclei with time.
In this article I shall point out some other dating methods which work the same way as the Rb-Sr method.
The reader who has not read the article on the Rb-Sr method will find this present article almost completely incomprehensible, and should go back and read it.
In the reasoning that follows, the reader may recognize a sort of family resemblance to the reasoning behind step heating in the Ar-Ar method, although the two are not exactly alike. When an igneous rock is first formed, its minerals will contain varying concentrations of rubidium and strontium, with some minerals being high in rubidium and low in strontium, others being high in strontium and low in rubidium.
In the Rb-Sr method, we used Sr, and it will be equally valid.
Scientists typically determine the age of a rock or meteorite by using the isochron method.
For purposes of illustration, consider the rubidium-strontium decay system.
When we produced the formula for K-Ar dating, it was reasonable enough to think that there was little to no argon present in the original state of the rock, because argon is an inert gas, does not take part in chemical processes, and so in particular does not take part in mineral formation.
Strontium, on the other hand, does take part in chemical reactions, and can substitute chemically for such elements as calcium, which is commonly found in igneous rocks.
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To achieve stability, some ‘particles’ are ejected from the atoms, and these moving ‘particles’ constitute the radioactivity measured by Geiger counters and the like.