Isotope Fractionation and the Pressure Effect on 18O/16O in Kyanite-Sillimanite-Andalusite Polymorphs (Al2SiO5) : Ab-Initio Modelling. / Krylov, D. P.; Kuznetsov, A. B.; Gavrilova, A. A.
In: Doklady Earth Sciences, Vol. 491, No. 2, 01.04.2020, p. 235-237.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Isotope Fractionation and the Pressure Effect on 18O/16O in Kyanite-Sillimanite-Andalusite Polymorphs (Al2SiO5)
T2 - Ab-Initio Modelling
AU - Krylov, D. P.
AU - Kuznetsov, A. B.
AU - Gavrilova, A. A.
N1 - Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - 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).
AB - 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).
KW - AlSiO
KW - geothermometry
KW - β-factors
UR - http://www.scopus.com/inward/record.url?scp=85086452400&partnerID=8YFLogxK
U2 - 10.1134/S1028334X20040091
DO - 10.1134/S1028334X20040091
M3 - Article
AN - SCOPUS:85086452400
VL - 491
SP - 235
EP - 237
JO - Doklady Earth Sciences
JF - Doklady Earth Sciences
SN - 1028-334X
IS - 2
ER -
ID: 75949793