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This technique is used on ferromagnesian (iron/magnesium-containing) minerals such as micas and amphiboles or on limestones which also contain abundant strontium.

However, both Rb and Sr easily follow fluids that move through rocks or escape during some types of metamorphism. The dual decay of potassium (K) to 40Ar (argon) and 40Ca (calcium) was worked out between 19.

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It is useful for dating very old igneous and metamorphic rocks and also meteorites and other cosmic fragments.Some techniques place the sample in a nuclear reactor first to excite the isotopes present, then measure these isotopes using a mass spectrometer (such as in the argon-argon scheme).Others place mineral grains under a special microscope, firing a laser beam at the grains which ionises the mineral and releases the isotopes.The isotopes are then measured within the same machine by an attached mass spectrometer (an example of this is SIMS analysis).This is a common dating method mainly used by archaeologists, as it can only date geologically recent organic materials, usually charcoal, but also bone and antlers.

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