Difference between revisions of "D18O"
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( StableOxygenIsotope )
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| − | === | + | === δ<sup>18</sup>O === |
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| + | Oxygen has three naturally-occuring stable [[:Category:Isotope | isotopes]]: <sup>16</sup>O, <sup>17</sup>O, <sup>18</sup>O, with <sup>16</sup>O being the most abundant (99.762%). | ||
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| + | Two international reference [[standard | standards]] are used to report variations in oxygen isotope standards: [[PDB]] and [[SMOW]]. The use of the [[PDB]] standard in reporting oxygen isotope composition is restricted to carbonates of low-temperature origins (e.g., [[Marine sediment | oceanic]], [[Lake sediment | lacustrine ]]). The conversion between SMOW and PDB scales is given by: | ||
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| + | <div style="text-align: center;"> <math> \delta^{18}O_{SMOW} = 1.03091 (\delta^{18}O_{PDB}) +30.91 </math> </div> | ||
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| + | δ<sup>18</sup>O may be measured on: | ||
| + | *the [[stable oxygen isotopes in foraminifera | shells]] of [[:Category:Foraminifera | foraminifera]] | ||
| + | *Ice cores | ||
| + | * Speleothems... | ||
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[[Category:StableOxygenIsotope]] | [[Category:StableOxygenIsotope]] | ||
Latest revision as of 18:03, 12 June 2017
δ18O
Oxygen has three naturally-occuring stable isotopes: 16O, 17O, 18O, with 16O being the most abundant (99.762%).
Two international reference standards are used to report variations in oxygen isotope standards: PDB and SMOW. The use of the PDB standard in reporting oxygen isotope composition is restricted to carbonates of low-temperature origins (e.g., oceanic, lacustrine ). The conversion between SMOW and PDB scales is given by:
δ18O may be measured on:
- the shells of foraminifera
- Ice cores
- Speleothems...
