20 Jul Stable Isotopes
Isotopes are atoms of same element having different numbers of neutrons leading to differing atomic masses. With the exception of C, general geological processes do not affect separation of the isotopes used in absolute dating. But certain elements of low atomic no. tend to show very systematic variations in isotope ratios in very ordinary geological processes like weathering, crystallization, diagenesis, authigenesis etc. By precise measurements of isotope ratios, inferences can be drawn about the conditions and reactions that created such changes.
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