Argon isotope dating

But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.

The amount of 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.The geomagnetic polarity time scale was calibrated largely using K–Ar dating.Ar (argon), the atom typically remains trapped within the lattice because it is larger than the spaces between the other atoms in a mineral crystal.An Ar-Ar "dating" study of high-grade metamorphic rocks in the Broken Hill region (New South Wales) found widely distributed excess will always be retained in those trapping sites in minerals where it is "held" more tightly.A viable interpretation of these Broken Hill data was only produced because assumptions were made about the age of the rocks and of a presumed subsequent heating event (based on Pb-Pb and Rb-Sr dating), when it is conjectured that accumulated The six domains are physically distinct units which exhibit wide differences in average physical and chemical properties, as well as structure and tectonic behavior.

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