Abstract: The β-factor dependences on temperature upon 18O/16O substitution have been originally deduced in andalusite, sillimanite and kyanite accounting for pressure effect: 1000lnβand(18O/16O) = 10.66466x – 0.19330x2 + 0.00282x3 + P(0.12748x – 0.00289x2) 1000lnβsil(18O/16O) = 10.51480x – 0.17485x2 + 0.001406x3 + P(0.12124x – 0.00286x2) 1000lnβky(18O/16O) = 10.14019x – 0.07573x2 + 0.00550x3 + P(0.09907x – 0.00206x2), x = 106/T2 (K)–2, P is pressure (GPa). The relations can be used in isotope geothermometry. Pressure produces an increase of the β-factors and consequently, δ18OAI2SiOS up to ≈0.5‰ in conditions of the “cold” subduction (at extremely low dT/dP gradients).
| Original language | English |
|---|---|
| Pages (from-to) | 235-237 |
| Number of pages | 3 |
| Journal | Doklady Earth Sciences |
| Volume | 491 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Apr 2020 |
| Externally published | Yes |
ID: 75949793