Nitrogen isotopes in peridotitic diamonds from Fuxian, China: The mantle signature

Pierre Cartigny; Stuart R. Boyd; Jeff W. Harris; Marc Javoy

doi:10.1046/j.1365-3121.1997.d01-26.x

Nitrogen isotopes in peridotitic diamonds from Fuxian, China

The mantle signature

Pierre Cartigny^*, Stuart R. Boyd, Jeff W. Harris, Marc Javoy

^*Corresponding author for this work

Research output: Contribution to journal › Article

95 Citations (Scopus)

Abstract

Nitrogen isotopes in peridotitic diamonds from Fuxian, China, suggest that the upper mantle δ¹⁵N-value has been globally homogeneous since at least the Proterozoic (-5 to -8‰/ATM), with similar values for subcontinental and MORB mantle. In addition, Fuxian diamonds retain the memory of a primary nitrogen lower in δ¹⁵N (down to -25‰). For the first time δ¹⁵N-values in diamonds match those of enstatite chondrites, supporting a formation of the Earth from such meteorites and the idea of a heterogeneous accretion of the Earth's volatiles. Nitrogen concentrations in diamonds are believed to depend strongly on the rate of the diamond growth and not to be an indicator of C/N ratios of the fluids from which they grew.

Original language	English
Pages (from-to)	175-179
Number of pages	5
Journal	Terra Nova
Volume	9
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-3121.1997.d01-26.x
Publication status	Published - 1 Dec 1997
Externally published	Yes

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@article{2ed3aeaf8cff45fc96cce312da09ac4b,

title = "Nitrogen isotopes in peridotitic diamonds from Fuxian, China: The mantle signature",

abstract = "Nitrogen isotopes in peridotitic diamonds from Fuxian, China, suggest that the upper mantle δ15N-value has been globally homogeneous since at least the Proterozoic (-5 to -8‰/ATM), with similar values for subcontinental and MORB mantle. In addition, Fuxian diamonds retain the memory of a primary nitrogen lower in δ15N (down to -25‰). For the first time δ15N-values in diamonds match those of enstatite chondrites, supporting a formation of the Earth from such meteorites and the idea of a heterogeneous accretion of the Earth's volatiles. Nitrogen concentrations in diamonds are believed to depend strongly on the rate of the diamond growth and not to be an indicator of C/N ratios of the fluids from which they grew.",

author = "Pierre Cartigny and Boyd, {Stuart R.} and Harris, {Jeff W.} and Marc Javoy",

year = "1997",

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language = "English",

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T1 - Nitrogen isotopes in peridotitic diamonds from Fuxian, China

T2 - The mantle signature

AU - Cartigny, Pierre

AU - Boyd, Stuart R.

AU - Harris, Jeff W.

AU - Javoy, Marc

PY - 1997/12/1

Y1 - 1997/12/1

N2 - Nitrogen isotopes in peridotitic diamonds from Fuxian, China, suggest that the upper mantle δ15N-value has been globally homogeneous since at least the Proterozoic (-5 to -8‰/ATM), with similar values for subcontinental and MORB mantle. In addition, Fuxian diamonds retain the memory of a primary nitrogen lower in δ15N (down to -25‰). For the first time δ15N-values in diamonds match those of enstatite chondrites, supporting a formation of the Earth from such meteorites and the idea of a heterogeneous accretion of the Earth's volatiles. Nitrogen concentrations in diamonds are believed to depend strongly on the rate of the diamond growth and not to be an indicator of C/N ratios of the fluids from which they grew.

AB - Nitrogen isotopes in peridotitic diamonds from Fuxian, China, suggest that the upper mantle δ15N-value has been globally homogeneous since at least the Proterozoic (-5 to -8‰/ATM), with similar values for subcontinental and MORB mantle. In addition, Fuxian diamonds retain the memory of a primary nitrogen lower in δ15N (down to -25‰). For the first time δ15N-values in diamonds match those of enstatite chondrites, supporting a formation of the Earth from such meteorites and the idea of a heterogeneous accretion of the Earth's volatiles. Nitrogen concentrations in diamonds are believed to depend strongly on the rate of the diamond growth and not to be an indicator of C/N ratios of the fluids from which they grew.

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