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In 2013, the K–Ar method was used by the Mars Curiosity rover to date a rock on the Martian surface, the first time a rock has been dated from its mineral ingredients while situated on another planet.
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The amount of is also measured to assess how much of the total argon is atmospheric in origin. 11) the following assumptions must be true for computed dates to be accepted as representing the true age of the rock: Both flame photometry and mass spectrometry are destructive tests, so particular care is needed to ensure that the aliquots used are truly representative of the sample.But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.