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This one additional piece of information about the initial state of the rock allows us to calculate its age.
As with the other methods we've discussed so far, the Rb-Sr method will only work if nothing but the passage of time has affected the distribution of the key isotopes within the rock.
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As rubidium easily substitutes chemically for potassium, it can be found doing so in small quantities in potassium-containing minerals such as biotite, potassium feldspar, and hornblende.
I find that women are more cautious when it comes to initiating contact but this could be the perfect way to eradicate the 'damsel in distress' attitude, where women are seen as 'needing a man' to take the lead.We shall omit the math, but it happens to work out so that after any given period of time, the minerals will still lie on a straight line on the graph, as the diagram shows, and, crucially, the point at which this line intersects the vertical axis is still the initial value of Sr.What we have to do is take samples from the rock consisting of different minerals, or at least of different mineral composition, so that our samples will all have different Sr ratio.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.