Phlogopite-pargasite coexistence in an oxygen reduced spinel-peridotite ambient.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
04 Jun 2021
04 Jun 2021
Historique:
received:
08
09
2020
accepted:
04
05
2021
entrez:
5
6
2021
pubmed:
6
6
2021
medline:
6
6
2021
Statut:
epublish
Résumé
The occurrence of phlogopite and amphibole in mantle ultramafic rocks is widely accepted as the modal effect of metasomatism in the upper mantle. However, their simultaneous formation during metasomatic events and the related sub-solidus equilibrium with the peridotite has not been extensively studied. In this work, we discuss the geochemical conditions at which the pargasite-phlogopite assemblage becomes stable, through the investigation of two mantle xenoliths from Mount Leura (Victoria State, Australia) that bear phlogopite and the phlogopite + amphibole (pargasite) pair disseminated in a harzburgite matrix. Combining a mineralogical study and thermodynamic modelling, we predict that the P-T locus of the equilibrium reaction pargasite + forsterite = Na-phlogopite + 2 diopside + spinel, over the range 1.3-3.0 GPa/540-1500 K, yields a negative Clapeyron slope of -0.003 GPa K
Identifiants
pubmed: 34088914
doi: 10.1038/s41598-021-90844-w
pii: 10.1038/s41598-021-90844-w
pmc: PMC8178368
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
11829Subventions
Organisme : Italian Ministry for Education, University and Research (MIUR)
ID : PRIN2017-2017L83S77
Organisme : Italian Ministry for Education, University and Research (MIUR)
ID : PRIN2017-2017L83S77
Organisme : University of Ferrara Research Fund 2020
ID : FAR2088483
Organisme : University of Ferrara Research Fund 2020
ID : FAR2088483
Organisme : Fondi di Ateneo Sapienza Università di Roma 2017 and 2018
ID : Fondi di Ateneo Sapienza Università di Roma 2017 and 2018
Organisme : Fondi di Ateneo Sapienza Università di Roma 2017 and 2018
ID : Fondi di Ateneo Sapienza Università di Roma 2017 and 2018
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