Why Is Potassium Argon Dating Unreliable

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Why is potassium argon dating unreliable
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Since the potassium-argon dating methods clearly appear to be unreliable , why should any rational person trust them to provide accurate dates for rocks? In the early 1950s, scientists established theories for using the decay of radioactive potassium (40 K) to argon (40 Ar) as a clock for dating certain types of rocks . Called "noble" because it rarely bonds with other elements, argon (Ar) is one of the six noble gases .
What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals . Argon makes up 1 percent of the atmosphere . So assuming that no air gets into a mineral grain when it first forms, it has zero argon content .
Potassium-argon " dating " of five of these flows and deposits yielded K-Ar model "ages" from <0 .27 Ma to 3 .5±0 .2 Ma . "Dates" could not be reproduced, even from splits of the same samples from the same flow, the explanation being variations in excess 40 Ar* content . A survey of anomalous K-Ar "dates" indicates they are common . . .
When scientists at the University of Regina, Saskatchewan were asked what the results would be if these roots were dated by Potassium Argon method . Their response was that the results: "Would be meaningless; it would indicate an age of millions of years Because Heat was Involved in the petrification process ."
These basalts yield ages of up to 1 million years based on the amounts of potassium and argon isotopes in the rocks . But when we date the rocks using the rubidium and strontium isotopes, we get an age of 1 .143 billion years . This is the same age that we get for the basalt layers deep below the walls of the eastern Grand Canyon .4
Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials . Geologists have used this method to date rocks as much as 4 billion years old . It is based on the fact that some of the radioactive isotope of Potassium , Potassium -40 (K-40) ,decays to the gas Argon as Argon -40 (Ar-40) .
In order to determine how old the Earth is , these scientists use a technique called potassium-argon dating (K-AR) . A particular isotope of potassium , K-40, undergoes a decay process and eventually becomes an argon isotope, Ar-40 . It is reasonable to ask if the K-Ar test is accurate before we accept its results as accurate .
Potassium-argon dating , method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock . This dating method is based upon the decay of radioactive potassium -40 to radioactive argon -40 in minerals and rocks; potassium -40 also decays to calcium-40 . Thus, the ratio of argon -40 and potassium -40 and radiogenic calcium-40 to potassium -40 in a mineral or rock is a measure of the age of the sample .
hyperphysics .phy-astr .gsu .edu › hbase › Nuclear › KAr .html
Potassium-Argon Dating . Potassium-Argon dating has the advantage that the argon is an inert gas that does not react chemically and would not be expected to be included in the solidification of a rock, so any found inside a rock is very likely the result of radioactive decay of potassium . Since the argon will escape if the rock is melted, the dates obtained are to the last molten time for the rock .
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Why Is Potassium Argon Dating Unreliable