Tracking slab surface temperatures with electrical conductivity of glaucophane.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
09 Sep 2021
09 Sep 2021
Historique:
received:
18
05
2021
accepted:
17
08
2021
entrez:
10
9
2021
pubmed:
11
9
2021
medline:
11
9
2021
Statut:
epublish
Résumé
Slab surface temperature is one of the key parameters that incur first-order changes in subduction dynamics. However, the current thermal models are based on empirical thermal parameters and do not accurately capture the complex pressure-temperature paths of the subducting slab, prompting significant uncertainties on slab temperature estimations. In this study, we investigate whether the dehydration-melting of glaucophane can be used to benchmark the temperature in the slab. We observe that dehydration and melting of glaucophane occur at relatively low temperatures compared to the principal hydrous phases in the slab and produce highly conductive Na-rich melt. The electrical properties of glaucophane and its dehydration products are notably different from the hydrous minerals and silicate melts. Hence, we conclude that the thermodynamic instability of glaucophane in the slab provides a unique petrological criterion for tracking temperature in the present-day subduction systems through magnetotelluric profiles.
Identifiants
pubmed: 34504176
doi: 10.1038/s41598-021-97317-0
pii: 10.1038/s41598-021-97317-0
pmc: PMC8429578
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
18014Subventions
Organisme : Agence Nationale de la Recherche
ID : ANR-10-LABX-0006
Organisme : National Science Foundation
ID : EAR 1753125
Organisme : National Science Foundation
ID : 1763215
Informations de copyright
© 2021. The Author(s).
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