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Potassium argon dating problems

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"In a billion years [from now], it seems, intelligent life might be as different from humans as humans are from insects . To change from a human being to a cloud may seem a big order, but it's the kind of change you'd expect over billions of years." Freeman Dyson, Statement made in 1986, quoted in Asimov's Book of Science and Nature Quotations, p. [American mathematician.]"Slowness has really nothing to do with the question.An event is not any more intrinsically intelligible or unintelligible because of the pace at which it moves.Of the naturally occurring isotopes of potassium, 40K is radioactive and decays into 40Ar at a precisely known rate, so that the ratio of 40K to 40Ar in minerals is always proportional to the time elapsed since the mineral formed [ 40K is a potassium atom with an atomic mass of 40 units; 40Ar is an argon atom with an atomic mass of 40 units].This relationship is useful to geochronologists, because quite a few minerals in the Earth’s crust contain measurable quantities of potassium (e.g. In theory, therefore, we can estimate the age of the mineral simply by measuring the relative abundances of each isotope.Over the past 60 years, potassium-argon dating has been extremely successful, particularly in dating the ocean floor and volcanic eruptions.K-Ar ages away from spreading ridges, just as we might expect, and recent volcanic eruptions yield very young dates, while older volcanic rocks yield very old dates.Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.

Argon can mobilized into or out of a rock or mineral through alteration Ar and potassium, there is not a reliable way to determine if the assumptions are valid.of grains between top and bottom is always proportional to the time elapsed.In principle, the potassium-argon (K-Ar) decay system is no different.This was dealt with in the chapter by that name (chapter 1).Second, generation of living organisms from non-living matter, or origin of life.(see link) Scenario: I heard about a group of people (yes they happen to be creationists with an agenda, but this should be irrelevant to the question I am posing!