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oxygen isotope ratio
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oxygen isotope ratio

chemistry
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Quick Summary

The oxygen isotope ratio refers to the relative amounts of different isotopes of oxygen, primarily oxygen-16 (16O) and oxygen-18 (18O). These isotopes have the same number of protons but different numbers of neutrons, making them slightly different in mass.12

This ratio is significant in various scientific fields:
* Climate Science: The ratio of 18O to 16O in marine microfossil shells reflects past ocean temperatures and the amount of ice stored on land. Higher ratios indicate colder periods with more ice.1
* Geochemistry: The Earth's crust has a higher concentration of 18O than the mantle, which helps scientists understand magma origins.3
* Biochemistry: Living organisms preferentially incorporate lighter isotopes, providing insights into early biochemical evolution.4

Isotopic fractionation is the process where the ratio of isotopes changes due to chemical or physical processes, such as evaporation or photosynthesis.2

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6 Britannica Sources
  1. oxygen
  2. Pleistocene Epoch - Marine oxygen isotope record
  3. mass spectrometry - Hydrogen , carbon , nitrogen , oxygen , and sulfur in nature
  4. isotopic fractionation
  5. mass spectrometry - Geochronology and geochemistry
  6. isotope - Molecular vibrations

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