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The dates are directly tied to the ratios. You take the ratios and plug them into a mathematical formula, and that is how you get the dates.
Try plugging them into reality.
So why would ratios of different isotope pairs produce the same date? You simply can not explain that.
Yes I can. There is a pattern of more of one sort of isotope than the other that was left in place as our nature began. You desire to interpret that as having resulted from old ages and a same state past and nature. That is why you assign so called dates to the ratios. This you do with more than one material, so naturally you would misrepresent the pattern similarly in many materials.
Why would they have any daughter material?
Because that material was here presumably and in action doing something in the former nature. I wouldn't think it all magically appeared. Maybe one way an evo could relate to it would be to think of it sort of like 'vestigial remains'! No longer doing what it used to.
Why would that cause already formed zircons to have Pb in them?
Who says it wasn't there already?
Why would this cause the K/Ar and U/Pb dates to match each other?
Because you cause ratios to mean dates, naturally the patterns would render 'older' dates since there is more (what is now) parent material!
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