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Archean Eon
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=== Oxygen Isotopes (Oxygen-16 and Oxygen-18) === * The ratio of oxygen-18 (¹⁸O) to oxygen-16 (¹⁶O) in sedimentary rocks, particularly in carbonates, is used to infer past water temperatures. This method is based on the principle that lighter isotopes evaporate faster than heavier ones, but heavier isotopes are more easily incorporated into precipitates. Thus, variations in this ratio can indicate changes in ancient ocean temperatures. * Oxygen isotopes also provide information on the hydrological cycle, including the sources of water and the conditions under which hydrological processes occurred.
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