A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

Sami Mikhail; Michele Rinaldi; Eleanor R. Mare; Dimitri Sverjensky

doi:10.7185/geochemlet.2111

A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

Sami Mikhail^*, Michele Rinaldi, Eleanor R. Mare, Dimitri Sverjensky

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	33-38
Journal	Geochemical Perspectives Letters
Volume	17
DOIs	https://doi.org/10.7185/geochemlet.2111
Publication status	Published - 24 Mar 2021

Keywords

Diamond formation
Metasomatism
Pyroxenite
Geochemical modelling
Mantle petrology
Deep carbon cycle

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10.7185/geochemlet.2111Licence: CC BY-NC-ND

Mikhail et al., 2021 GPL
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.
Final published version, 3.93 MBLicence: CC BY-NC-ND

1 Finished

The Nature of the Deep Nitrogen Cycle: The nature of the deep nitrogen cycle
Mikhail, S. (PI)
NERC
1/06/17 → 4/09/20
Project: Standard

A genetic link between eclogitic and peridotitic diamond inclusions (dataset)
Mikhail, S. (Creator), Rinaldi, M. (Creator), E.R., M. (Creator) & D.A., S. (Creator), University of St Andrews, 7 Apr 2021
DOI: 10.17630/32ebd3c0-bba6-4aa1-9b6d-c53a0a3b61e0
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title = "A genetic metasomatic link between eclogitic and peridotitic diamond inclusions",

abstract = "Diamond inclusions sample the otherwise inaccessible archive of Earth{\textquoteright}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.",

keywords = "Diamond formation, Metasomatism, Pyroxenite, Geochemical modelling, Mantle petrology, Deep carbon cycle",

author = "Sami Mikhail and Michele Rinaldi and Mare, {Eleanor R.} and Dimitri Sverjensky",

note = "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).",

year = "2021",

month = mar,

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doi = "10.7185/geochemlet.2111",

language = "English",

volume = "17",

pages = "33--38",

journal = "Geochemical Perspectives Letters",

issn = "2410-339X",

publisher = "European Association of Geochemistry",

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TY - JOUR

T1 - A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

AU - Mikhail, Sami

AU - Rinaldi, Michele

AU - Mare, Eleanor R.

AU - Sverjensky, Dimitri

N1 - 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).

PY - 2021/3/24

Y1 - 2021/3/24

N2 - 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.

AB - 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.

KW - Diamond formation

KW - Metasomatism

KW - Pyroxenite

KW - Geochemical modelling

KW - Mantle petrology

KW - Deep carbon cycle

U2 - 10.7185/geochemlet.2111

DO - 10.7185/geochemlet.2111

M3 - Article

SN - 2410-339X

VL - 17

SP - 33

EP - 38

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

ER -

A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

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Keywords

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The Nature of the Deep Nitrogen Cycle: The nature of the deep nitrogen cycle

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A genetic link between eclogitic and peridotitic diamond inclusions (dataset)

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