Carbon isotope composition of graphite in mantle eclogites

D. J. Schulze; J. W. Valley; K. S. Viljoen; J. Stiefenhofer; M. Spicuzza

doi:10.1086/515933

Carbon isotope composition of graphite in mantle eclogites

D. J. Schulze, J. W. Valley, K. S. Viljoen, J. Stiefenhofer, M. Spicuzza

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

24 Citations (Scopus)

Abstract

The carbon isotope composition (δ¹³C) of primary graphite from 28 mantle derived eclogite xenoliths from kimberlites in southern Africa and USA range from -14.31 to -2.84‰_PDB, with a mean value of -6.2‰. Both Group I and Group II eclogites are represented by anomalously low carbon isotope ratios. There is no simple correlation between isotopic composition and depth of origin, demonstrating carbon isotopic heterogeneity in the shallow upper mantle not previously recognized, but known from the deeper eclogite diamond population. Interpreted in the light of recent geochemical evidence supporting a subduction origin for some mantle eclogites and their diamonds, low δ¹³C graphite-bearing eclogites could represent some of the earliest material emplaced beneath the cratons by subduction.

Original language	English
Pages (from-to)	379-386
Number of pages	8
Journal	Journal of Geology
Volume	105
Issue number	3
DOIs	https://doi.org/10.1086/515933
Publication status	Published - May 1997
Externally published	Yes

ASJC Scopus subject areas

Geology

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title = "Carbon isotope composition of graphite in mantle eclogites",

abstract = "The carbon isotope composition (δ13C) of primary graphite from 28 mantle derived eclogite xenoliths from kimberlites in southern Africa and USA range from -14.31 to -2.84‰PDB, with a mean value of -6.2‰. Both Group I and Group II eclogites are represented by anomalously low carbon isotope ratios. There is no simple correlation between isotopic composition and depth of origin, demonstrating carbon isotopic heterogeneity in the shallow upper mantle not previously recognized, but known from the deeper eclogite diamond population. Interpreted in the light of recent geochemical evidence supporting a subduction origin for some mantle eclogites and their diamonds, low δ13C graphite-bearing eclogites could represent some of the earliest material emplaced beneath the cratons by subduction.",

author = "Schulze, {D. J.} and Valley, {J. W.} and Viljoen, {K. S.} and J. Stiefenhofer and M. Spicuzza",

year = "1997",

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doi = "10.1086/515933",

language = "English",

volume = "105",

pages = "379--386",

journal = "Journal of Geology",

issn = "0022-1376",

publisher = "University of Chicago",

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T1 - Carbon isotope composition of graphite in mantle eclogites

AU - Schulze, D. J.

AU - Valley, J. W.

AU - Viljoen, K. S.

AU - Stiefenhofer, J.

AU - Spicuzza, M.

PY - 1997/5

Y1 - 1997/5

N2 - The carbon isotope composition (δ13C) of primary graphite from 28 mantle derived eclogite xenoliths from kimberlites in southern Africa and USA range from -14.31 to -2.84‰PDB, with a mean value of -6.2‰. Both Group I and Group II eclogites are represented by anomalously low carbon isotope ratios. There is no simple correlation between isotopic composition and depth of origin, demonstrating carbon isotopic heterogeneity in the shallow upper mantle not previously recognized, but known from the deeper eclogite diamond population. Interpreted in the light of recent geochemical evidence supporting a subduction origin for some mantle eclogites and their diamonds, low δ13C graphite-bearing eclogites could represent some of the earliest material emplaced beneath the cratons by subduction.

AB - The carbon isotope composition (δ13C) of primary graphite from 28 mantle derived eclogite xenoliths from kimberlites in southern Africa and USA range from -14.31 to -2.84‰PDB, with a mean value of -6.2‰. Both Group I and Group II eclogites are represented by anomalously low carbon isotope ratios. There is no simple correlation between isotopic composition and depth of origin, demonstrating carbon isotopic heterogeneity in the shallow upper mantle not previously recognized, but known from the deeper eclogite diamond population. Interpreted in the light of recent geochemical evidence supporting a subduction origin for some mantle eclogites and their diamonds, low δ13C graphite-bearing eclogites could represent some of the earliest material emplaced beneath the cratons by subduction.

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DO - 10.1086/515933

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SP - 379

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JO - Journal of Geology

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Carbon isotope composition of graphite in mantle eclogites

Abstract

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