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A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

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Date
24/03/2021
Author
Mikhail, Sami
Rinaldi, Michele
Mare, Eleanor R.
Sverjensky, Dimitri
Funder
NERC
Grant ID
NE/P012167/1
Keywords
Diamond formation
Metasomatism
Pyroxenite
Geochemical modelling
Mantle petrology
Deep carbon cycle
GE Environmental Sciences
DAS
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Abstract
Diamond inclusions sample the otherwise inaccessible archive of Earth’s deep interior. The geochemical and petrological diversity of diamond inclusions reflects either pre-metasomatic upper mantle heterogeneity or metasomatism coeval with diamond formation. We focus on the origin of lithospheric garnet and clinopyroxene inclusions by simulating metasomatic reactions between eclogitic fluids and mantle peridotites at 5 GPa, 1000 °C, and across a range of redox conditions (logfO2 = −1 to −6 ΔFMQ). Our results demonstrate that fluid-rock interaction can result in the formation of eclogitic, websteritic, and peridotitic silicates from a single fluid during a single diamond-forming metasomatic event. Ergo, the petrogenesis of diamond and their inclusions can be syngenetic, and the petrological diversity of diamond inclusions can reflect metasomatism coeval with diamond formation. Furthermore, during the metasomatism, refractory peridotite can be converted to fertile websterite which could become a pyroxenitic mantle source for oceanic basalts.
Citation
Mikhail , S , Rinaldi , M , Mare , E R & Sverjensky , D 2021 , ' A genetic metasomatic link between eclogitic and peridotitic diamond inclusions ' , Geochemical Perspectives Letters , vol. 17 , pp. 33-38 . https://doi.org/10.7185/geochemlet.2111
Publication
Geochemical Perspectives Letters
Status
Peer reviewed
DOI
https://doi.org/10.7185/geochemlet.2111
ISSN
2410-339X
Type
Journal article
Rights
Copyright © 2021 The Authors. Open Access. This work is distributed under the Creative Commons Attribution Non-Commercial No-Derivatives 4.0 License, which permits unrestricted distribution provided the original author and source are credited. The material may not be adapted (remixed, transformed or built upon) or used for commercial purposes without written permission from the author. Additional information is available at https://www.geochemicalperspectivesletters.org/copyright-and-permissions.
Description
Funding for SM, ERM, and MR is provided by NERC standard grant (NE/P012167/1) and UK Space Agency Aurora grant (ST/T001763/1). Funding for DAS is provided by the US DOE (DE-FG-02-96ER-14616) and the US NSF (EAR 1624325 and ACI 1550346).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/21754

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