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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.
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We can expect these differences to be quite pronounced, because rubidium and strontium have different chemical affinities: as we have noted, rubidium substitutes for potassium, and strontium for calcium.
About half the time this will produce a straight line with negative slope: that is, it will slope down from left to right instead of up.