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Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia

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Abstract

Mantle xenoliths from the Obnazhennaya kimberlite pipe, Yakutia, possess a large range of mineralogical and chemical compositions, from both group A and B eclogites. Major-element contents of the group A eclogites exhibit transitional features between the group B eclogites and peridotite. The Mg# of clinopyroxenes is 0.86–0.94, with 0.60–0.84 for garnets. Differences in concentration of LREEs exist between the Obnazhennaya group A and the well-studied group B eclogites from the Udachnaya kimberlite pipe. In general, garnets in the group A eclogites contain lower LREEs than those from the group B eclogites; however, the trend for clinopyroxene is reversed. High δ 18O (5.46–7.81) values, and the positive Eu anomalies in the garnets and clinopyroxenes (Eu/Eu* 1.2–1.4) demonstrate the involvement of an oceanic crustal component in the formation of the group A eclogites. The group A eclogites formed between 21.0 and 37.6 kbar, and 711 and 923 °C, in a time interval of 1,071–1,237 Ma. An innovative model is proposed to explain the formation of the group A eclogites and websterites. It involves the reaction of a depleted mantle peridotite with TTG and carbonatite melts closely related to the subduction of oceanic crust.

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Acknowledgments

We would like to thank Allan Patchen for his assistance with the electron microprobe analyses at the University of Tennessee, Nobu Shimizu for his assistance with the SIMS analyses, and Masa Kurosawa, University of Tsukuba for assistance with the LA-ICP-MS analyses. Vladimir Sobolev, Alfredo Camacho, and Prinya Promprated are thanked for their stimulating, provocative comments and assistance. Constructive and insightful comments from anonymous reviewers substantially helped to improve the quality of the manuscript. The handling of this manuscript by Dr. Tim Grove is greatly acknowledged. A major portion of this research was supported by NSF grants EAR 97-25885 and EAR 99-09430, for which we are grateful.

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  1. Planetary Geosciences Institute, Department of Earth & Planetary Sciences, University of Tennessee, Knoxville, TN, 37996-1410, USA

    Lawrence A. Taylor, Gregory A. Snyder, Randall Keller, David A. Remley, Mahesh Anand & Rene Wiesli

  2. Department of Geology and Geophysics, University of Wisconsin, Madison, WI, 53706, USA

    John Valley

  3. Institute of Mineralogy and Petrography, Russian Academy of Science, Novosibirsk, Russia

    Nikolai V. Sobolev

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  1. Lawrence A. Taylor
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Taylor, L.A., Snyder, G.A., Keller, R. et al. Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia. Contrib Mineral Petrol 145, 424–443 (2003). https://doi.org/10.1007/s00410-003-0465-y

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