Plume-lithosphere interaction, and the formation of fibrous diamonds

M. B. Broadley; H. Kagi; R. Burgess; D. Zedgenizov; Sami Mikhail; M. Almayrac; A. Ragozin; B. Pomazansky; H. Sumino

doi:10.7185/geochemlet.1825

Plume-lithosphere interaction, and the formation of fibrous diamonds

M. B. Broadley, H. Kagi, R. Burgess, D. Zedgenizov, Sami Mikhail, M. Almayrac, A. Ragozin, B. Pomazansky, H. Sumino

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

Abstract

Fluid inclusions in diamond provide otherwise inaccessible information on the origin and nature of carbonaceous fluid(s) in the mantle. Here we evaluate the role of subducted volatiles in diamond formation within the Siberian cratonic lithosphere. Specifically, we focus on the halogen (Cl, Br and I) and noble gas (He, Ne and Ar) geochemistry of fluids trapped within cubic, coated and cloudy fibrous diamonds from the Nyurbinskaya kimberlite, Siberia. Our data show Br/Cl and I/Cl ratios consistent with involvement of altered oceanic crust, suggesting subduction-derived fluids have infiltrated the Siberian lithosphere. ³He/⁴He ranging from 2 to 11 R_A, indicates the addition of a primordial mantle component to the SCLM. Mantle plumes may therefore act as a trigger to re-mobilise subducted carbon-rich fluids from the sub-continental lithospheric mantle, and we argue this may be an essential process in the formation of fluid-rich diamonds, and kimberlitic magmatism.

Original language	English
Pages (from-to)	26-30
Number of pages	5
Journal	Geochemical Perspectives Letters
Volume	8
DOIs	https://doi.org/10.7185/geochemlet.1825
Publication status	Published - 1 Oct 2018

Keywords

Diamond formation
Mantle plume
Halogens
Lithosphere
Subduction
Noble gas

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Cite this

@article{54a01f2b4faf4087b520c1bc249cd76e,

title = "Plume-lithosphere interaction, and the formation of fibrous diamonds",

abstract = "Fluid inclusions in diamond provide otherwise inaccessible information on the origin and nature of carbonaceous fluid(s) in the mantle. Here we evaluate the role of subducted volatiles in diamond formation within the Siberian cratonic lithosphere. Specifically, we focus on the halogen (Cl, Br and I) and noble gas (He, Ne and Ar) geochemistry of fluids trapped within cubic, coated and cloudy fibrous diamonds from the Nyurbinskaya kimberlite, Siberia. Our data show Br/Cl and I/Cl ratios consistent with involvement of altered oceanic crust, suggesting subduction-derived fluids have infiltrated the Siberian lithosphere. 3He/4He ranging from 2 to 11 RA, indicates the addition of a primordial mantle component to the SCLM. Mantle plumes may therefore act as a trigger to re-mobilise subducted carbon-rich fluids from the sub-continental lithospheric mantle, and we argue this may be an essential process in the formation of fluid-rich diamonds, and kimberlitic magmatism. ",

keywords = "Diamond formation, Mantle plume, Halogens, Lithosphere, Subduction, Noble gas",

author = "Broadley, {M. B.} and H. Kagi and R. Burgess and D. Zedgenizov and Sami Mikhail and M. Almayrac and A. Ragozin and B. Pomazansky and H. Sumino",

note = "This work was financially supported though a JSPS international research fellowship PE 14721 (to MWB) and JSPS KAKENHI grant numbers JP 26287139 and JP15KK0150 (to HS). The work of DAZ and ALR was supported by Russian science foundation (16-17-10067). RB acknowledges funding from the NERC (NE/M000427/1). SM acknowledges funding from the NERC (NE/PO12167/1).",

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doi = "10.7185/geochemlet.1825",

language = "English",

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publisher = "European Association of Geochemistry",

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TY - JOUR

T1 - Plume-lithosphere interaction, and the formation of fibrous diamonds

AU - Broadley, M. B.

AU - Kagi, H.

AU - Burgess, R.

AU - Zedgenizov, D.

AU - Mikhail, Sami

AU - Almayrac, M.

AU - Ragozin, A.

AU - Pomazansky, B.

AU - Sumino, H.

N1 - This work was financially supported though a JSPS international research fellowship PE 14721 (to MWB) and JSPS KAKENHI grant numbers JP 26287139 and JP15KK0150 (to HS). The work of DAZ and ALR was supported by Russian science foundation (16-17-10067). RB acknowledges funding from the NERC (NE/M000427/1). SM acknowledges funding from the NERC (NE/PO12167/1).

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Fluid inclusions in diamond provide otherwise inaccessible information on the origin and nature of carbonaceous fluid(s) in the mantle. Here we evaluate the role of subducted volatiles in diamond formation within the Siberian cratonic lithosphere. Specifically, we focus on the halogen (Cl, Br and I) and noble gas (He, Ne and Ar) geochemistry of fluids trapped within cubic, coated and cloudy fibrous diamonds from the Nyurbinskaya kimberlite, Siberia. Our data show Br/Cl and I/Cl ratios consistent with involvement of altered oceanic crust, suggesting subduction-derived fluids have infiltrated the Siberian lithosphere. 3He/4He ranging from 2 to 11 RA, indicates the addition of a primordial mantle component to the SCLM. Mantle plumes may therefore act as a trigger to re-mobilise subducted carbon-rich fluids from the sub-continental lithospheric mantle, and we argue this may be an essential process in the formation of fluid-rich diamonds, and kimberlitic magmatism.

AB - Fluid inclusions in diamond provide otherwise inaccessible information on the origin and nature of carbonaceous fluid(s) in the mantle. Here we evaluate the role of subducted volatiles in diamond formation within the Siberian cratonic lithosphere. Specifically, we focus on the halogen (Cl, Br and I) and noble gas (He, Ne and Ar) geochemistry of fluids trapped within cubic, coated and cloudy fibrous diamonds from the Nyurbinskaya kimberlite, Siberia. Our data show Br/Cl and I/Cl ratios consistent with involvement of altered oceanic crust, suggesting subduction-derived fluids have infiltrated the Siberian lithosphere. 3He/4He ranging from 2 to 11 RA, indicates the addition of a primordial mantle component to the SCLM. Mantle plumes may therefore act as a trigger to re-mobilise subducted carbon-rich fluids from the sub-continental lithospheric mantle, and we argue this may be an essential process in the formation of fluid-rich diamonds, and kimberlitic magmatism.

KW - Diamond formation

KW - Mantle plume

KW - Halogens

KW - Lithosphere

KW - Subduction

KW - Noble gas

UR - https://www.geochemicalperspectivesletters.org/article1825#Supplementary%20Information

UR - https://www.geochemicalperspectivesletters.org/corrigendum1825

U2 - 10.7185/geochemlet.1825

DO - 10.7185/geochemlet.1825

M3 - Article

SN - 2410-339X

VL - 8

SP - 26

EP - 30

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

ER -

Plume-lithosphere interaction, and the formation of fibrous diamonds

Abstract

Keywords

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

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Cite this

Plume-lithosphere interaction, and the formation of fibrous diamonds

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

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

Research output

A genetic metasomatic link between eclogitic and peridotitic diamond inclusions

A secretive mechanical exchange between mantle and crustal volatiles revealed by helium isotopes in 13C-depleted diamonds

Diamondites: evidence for a distinct tectono-thermal diamond-forming event beneath the Kaapvaal craton

Cite this

A secretive mechanical exchange between mantle and crustal volatiles revealed by helium isotopes in ¹³C-depleted diamonds