Komsomolskaya diamondiferous eclogites: evidence for oceanic crustal protoliths

  • John F. Pernet-Fisher
  • Geoffrey H. Howarth
  • Yang Liu
  • Peter H. Barry
  • Laura Carmody
  • John W. Valley
  • Robert J. Bodnar
  • Zdislav V. Spetsius
  • Lawrence A. Taylor
Original Paper


The Komsomolskaya kimberlite is one of numerous (>1,000) kimberlite pipes that host eclogite xenoliths on the Siberian craton. Eclogite xenoliths from the adjacent Udachnaya kimberlite pipe have previously been geochemically well characterized; however, data from surrounding diamond-bearing kimberlite pipes from the center of the craton are relatively sparse. Here, we report major- and trace-element data, as well as oxygen isotope systematics, for mineral separates of diamondiferous eclogite xenoliths from the Komsomolskaya kimberlite, suggesting two distinct subgroups of a metamorphosed, subducted oceanic crustal protolith. Using almandine contents, this suite can be divided into two subgroups: group B1, with a high almandine component (>20 mol%) and group B2, with a low almandine component (<20 mol%). Reconstructed REE profiles for B1 eclogites overlap with typical oceanic basalts and lack distinct Eu anomalies. In addition, elevated oxygen isotope values, which are interpreted to reflect isotopic exchange with seawater at low temperatures (<350 °C), are consistent with an upper-oceanic crustal protolith. Reconstructed REE profiles for B2 eclogites are consistent with oceanic gabbros and display distinct Eu anomalies, suggesting a plagioclase-rich cumulate protolith. In contrast to B1, B2 eclogites do not display elevated oxygen isotope values, suggesting an origin deep within the crustal pile, where little-to-no interaction with hydrothermal fluids has occurred. Major-element systematics were reconstructed based on mineral modes; group B1 eclogites have higher MgO wt% and lower SiO2 wt%, with respect to typical oceanic basalts, reflecting a partial melting event during slab subduction. Calculated residues from batch partial melt modeling of a range of Precambrian basalts overlap with group B1 trace-element chemistry. When taken together with the respective partial melt trajectories, these melting events are clearly linked to the formation of Tonalite–Trondhjemite–Granodiorite (TTG) complexes. As a result, we propose that many, if not all, diamondiferous eclogite xenoliths from Komsomolskaya represent mantle ‘restites’ that preserve chemical signatures of Precambrian oceanic crust.


SCLM Eclogites Siberian craton Mantle xenolith TTG complex 



The authors thank Mike Spicuzza, Allan Patchen, and Luca Fedele for their assistance with data collection. This work was funded by NSF Grants EAR-1144337 (LAT), EAR-1144559 (PHB), and EAR-0838058 (JWV). YL is currently supported at Jet Propulsion Laboratory, which is managed by California Institute of Technology, under a contract with NASA. We would like to thank Katie Smart and Ryan Ickert for constructive reviews of an earlier version of this manuscript, in addition to two anonymous reviewers for their comments and suggestions that added significantly to the revision of this manuscript.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • John F. Pernet-Fisher
    • 1
  • Geoffrey H. Howarth
    • 1
  • Yang Liu
    • 1
    • 2
  • Peter H. Barry
    • 1
  • Laura Carmody
    • 1
  • John W. Valley
    • 3
  • Robert J. Bodnar
    • 4
  • Zdislav V. Spetsius
    • 5
  • Lawrence A. Taylor
    • 1
  1. 1.Department of Earth and Planetary Sciences, Planetary Geosciences InstituteUniversity of TennesseeKnoxvilleUSA
  2. 2.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA
  3. 3.Department of GeoscienceUniversity of WisconsinMadisonUSA
  4. 4.Department of GeosciencesVirginia Polytechnic and State UniversityBlacksburgUSA
  5. 5.Institute of Diamond IndustryALROSA Company, Ltd.MirnyRussia

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